Brocade 7800 Extension Switch
16-Port 8 Gbps Fibre Channel Extension Switch with 6-Port Gigabit Ethernet

Features:

A Scalable, Flexible SAN Extension Platform

The Brocade 7800 is an ideal platform for building or expanding a high-performance SAN extension infrastructure for disaster recovery, data protection, and data mobility storage solutions (see figure 1). It leverages cost-effective IP WAN transport to extend open systems and mainframe disk and tape storage applications over distances that would otherwise be impossible, impractical, or too expensive with standard Fibre Channel connections.

Available in two configurations (the Brocade 7800 16/6 Extension Switch and the Brocade 7800 4/2 Extension Switch), the Brocade 7800 supports a variety of architectures and deployment models to address current and future SAN extension requirements. A broad range of optional advanced extension, FICON®, and SAN fabric services are available to address the most challenging extension and storage networking requirements.

The Brocade 7800 16/6 Extension Switch is a robust platform for data centers and multisite environments implementing disk and tape solutions for open systems and mainframe environments. Organizations can optimize bandwidth and throughput through sixteen 8 Gbps Fibre Channel ports and six 1 GbE ports. The Brocade 7800 16/6 Extension Switch is ideal for:

• Open systems and mainframe disk and tape extension
• Multisite synchronous and asynchronous storage replication
• Centralized SAN backup, recovery, and archiving
• Global data and storage resource migration, distribution, and sharing

The Brocade 7800 4/2 Extension Switch is a cost-effective option for smaller data centers and remote offices, for open systems and mainframe environments. Organizations can optimize bandwidth and throughput through four 8 Gbps Fibre Channel ports and two 1 GbE ports. The Brocade 7800 4/2 can be easily upgraded to the Brocade 7800 16/6 through software licensing, providing scalability and investment protection for growing environments. The Brocade 7800 4/2 Extension Switch is ideal for:

• Point-to-point synchronous and asynchronous open systems disk replication
• Point-to-point IBM z/OS Global Mirror (zGM, formerly known as eXtended Remote Copy or XRC) and mainframe tape extension
• Global data and storage resource migration, distribution, and sharing

Simplified Disaster Recovery and Data Protection

Today's organizations depend on fast, reliable access to data wherever and whenever needed, regardless of location. As a result, the ramifications and potential business impact of an inadequate disaster recovery and data protection infrastructure are greater than ever.

The advanced performance and network optimization features of the Brocade 7800 enable replication and backup applications to send more data over FCIP links in less time, protecting time-sensitive synchronous or other high-priority traffic, and optimizing available WAN bandwidth.

Acceleration for SCSI writes (FastWrite) and IBM zGM maximize replication performance and enable cost-effective synchronous and asynchronous replication across any distance. In addition, Tape Pipelining for open systems and mainframe tapes utilizes unique read and write tape processing to significantly reduce backup and recovery times over distance anywhere in the world. Optional FCIP Trunking provides FCIP tunnel redundancy for lossless path failover and guaranteed in-order data delivery in the event of a failure.

The Brocade 7800 leverages the core technology of Brocade systems performing at greater than 99.999 percent uptime in the world's most demanding data centers. It combines enterprise-class availability features such as hot-pluggable redundant power supplies and fans with non-disruptive software upgrades to maximize application uptime and minimize outages. These unique capabilities enable a high-performance and highly reliable network infrastructure for disaster recovery and data protection.

Unmatched Performance and Optimization

Best-in-class Fibre Channel and FCIP switch port density, bandwidth, and throughput address today's dynamic I/O and workload requirements and are designed to meet tomorrow's evolving requirements for virtual data centers. Supporting up to 350 ms Round-Trip Time (RTT) of latency, the Brocade 7800 enables cost-effective SAN extension solutions over distances up to 17,500 kilometers (nearly 11,000 miles).

The Brocade 7800 maximizes replication, backup, and migration throughput over distance using advanced Fibre Channel frame compression, disk and tape protocol acceleration, and FCIP networking technology. Unique features and technologies include the following:

• FCIP Trunking combines multiple IP source and destination address pairs into a single logical high-bandwidth FCIP trunk spanning multiple physical ports to provide load balancing and network failure resiliency.
• Adaptive Rate Limiting dynamically adjusts bandwidth between minimum and maximum rate limits to optimize bandwidth utilization and sharing.
• FCIP Quality of Service (QoS) provides high-, medium-, and low-priority handling of initiator-target flows within the same FCIP tunnel for transmission over the WAN with individual TCP sessions per
  QoS class.
• IPSec support ensures secure transport over WAN links by encrypting data-in-flight with standard 256-bit AES algorithm.
• Advanced compression architecture provides multiple modes to optimize compression ratios for various throughput requirements.
• FCIP Fast Write accelerates SCSI write processing, maximizing performance of synchronous and asynchronous replication applications across high-latency WAN connections.
• Open Systems Tape Pipelining accelerates read and write tape processing over distance, minimizing backup and restore windows.
• Brocade Advanced Accelerator for FICON uses advanced networking technologies, data management techniques, and protocol intelligence to accelerate IBM zGM, mainframe tape read and write operations, and z/OS host connection to Teradata warehousing systems over distance.
• Storage-Optimized TCP optimizes TCP window size and flow control, accelerating TCP transport for storage applications.

Integrated Architecture and Management

The Brocade 7800 utilizes the same Fabric OS that supports the entire Brocade SAN product family—from the Brocade 300 Switch to the Brocade DCX Backbone family. This helps ensure seamless interoperability with optional advanced features such as Brocade Integrated Routing, Brocade ISL Trunking, Brocade Adaptive Networking, Brocade Server Application Optimization (SAO), Brocade Advanced Performance Monitoring, Brocade Fabric Watch, and Brocade Extended Fabrics.

In addition, organizations can perform management and administrative tasks through familiar Brocade management tools, including Brocade Network Advisor, Brocade Data Center Fabric Manager (DCFM®), Brocade Web Tools, and the Command Line Interface (CLI). Moreover, optional FICON Control Unit Port (CUP) capabilities enable legacy management applications to seamlessly support Brocade FICON environments.

Deployment:

Figure 1. The Brocade 7800 provides flexible deployment options to extend disaster recovery, data protection, and data mobility storage solutions across any distance.

Specifications:

	7800 Extension Switch Specifications
System Architecture
Fibre Channel ports	16 ports, universal (E, F, M, EX, and FL)
FCIP ports	6 ports, 1 GbE (VE, VEX)
Scalability	Full fabric architecture with 239 switches maximum
Certified maximum	Single fabric: 56 domains, 7 hops Multiprotocol routing fabric: 19 hops
Fibre Channel performance	1.063 Gbps line speed, full duplex; 2.125 Gbps line speed, full duplex; 4.25 Gbps line speed, full duplex; 8.5 Gbps line speed, full duplex. Auto-sensing of 1 Gbps, 2 Gbps, 4 Gbps, and 8 Gbps port speeds; optionally programmable to fixed port speed. Speed matching between 1 Gbps, 2 Gbps, 4 Gbps, and 8 Gbps ports.
FCIP performance	1 Gbps line speed
ISL Trunking	Up to eight 8 Gbps ports per ISL trunk; up to 64 Gbps per ISL trunk. There is no limit to how many trunk groups can be configured in the switch.
Fibre Channel aggregate bandwidth	128 Gbps: 16 ports at 8 Gbps (data rate)
FCIP aggregate bandwidth	6 Gbps: 6 ports at 1 Gbps (data rate)
Fabric latency	700 ns with no contention, cut-through routing at 8 Gbps
Maximum frame size	2112-byte payload
Maximum MTU size	1500-byte Ethernet packets with FCIP
Classes of service	Class 2, Class 3, Class F (inter-switch frames)
Port types	FL_Port, F_Port, E_Port, EX_Port, M_Port (Mirror Port), and self-discovery based on switch type (U_Port). For FCIP, VE_Port (Virtual E_Port), VEX_Port (Virtual EX_Port).
Data traffic types	Fabric switches supporting unicast, multicast (255 groups), and broadcast
USB	One USB port for system log file downloads or firmware upgrades
Media types	Fibre Channel: Brocade hot-pluggable Small Form Factor Pluggable (SFP) and SFP+, LC connector; Short-Wave Laser (SWL) and Long-Wave Laser (LWL); distance depends on fiber-optic cable and port speed; supports SFP+ (2, 4, and 8 Gbps) and SFP (1, 2, and 4 Gbps) optical transceivers 1 GbE: Brocade hot-pluggable optical SFP, Short-Wave Laser (SWL) and Long-Wave Laser (LWL); GbE Copper SFP; built-in RJ-45 copper (two GbE ports); distance depends on fiber-optic or copper cable and port speed
Fabric services	Brocade Advanced Zoning, Dynamic Path Selection (DPS), FDMI, Enhanced Group Management (EGM), Frame Redirection, Registered State Change Notification (RSCN), Reliable Commit Service (RCS), and Simple Name Server (SNS). Optional fabric services include Brocade Adaptive Networking, Brocade Advanced Performance Monitoring, Brocade Fabric Watch, Brocade Integrated Routing, Brocade Server Application Optimization, Brocade Extended Fabrics, and Brocade ISL Trunking.
Licensing options	The following optional extension features can be enabled via license keys: Advanced Extension: Enables FCIP Trunking and Adaptive Rate Limiting Adaptive Networking: Activates Fibre Channel and FCIP QoS functionality Brocade 7800 Upgrade License: Enables all ports, additional FCIP tunnels, and open systems tape read/write pipelining FICON Management Server: Control Unit Port (CUP) enables host control of switches in mainframe environments Advanced Accelerator for FICON: Accelerates IBM zGM, mainframe tapes and z/OS host connection to Teradata systems over distance
Management
Supported management software	SSH v2, HTTP/HTTPS, SNMP v1/v3, Telnet; SNMP (FE MIB, FC Management MIB); Brocade Web Tools; Brocade Network Advisor; Brocade DCFM Professional, Professional Plus, and Enterprise (optional); SMI-S, RADIUS, LDAP
Security	DH-CHAP (between switches and end devices), HTTPS, IPsec, IP Filtering, LDAP, Port Binding, RADIUS, Role-Based Access Control (RBAC), Secure Copy (SCP), Secure RPC, SSH v2, SSL, Switch Binding, Trusted Switch
Management access	10/100/1000 Ethernet (RJ-45), in-band over Fibre Channel ports; serial port (RJ-45) and one USB port
Diagnostics	POST and embedded online/offline diagnostics, including FCping, Pathinfo (FCtraceroute), etc.
Mechanical
Enclosure	Back-to-front airflow; 1U, 19-inch EIA-compliant, power from back
Size	Width: 43.2 cm (17.0 in)  Height: 4.5 cm (1.8 in) Depth: 64.1 cm (25.2 in)
System weight	10.9 kg (24.0 lbs) with two power supplies, without SFP/SFP+
Environmental
Temperature	Operating: 0°C to 40°C (32°F to 104°F) Non-operating: -25°C to 70°C (-13°F to 158°F)
Humidity	Operating: 10% to 85% (non-condensing) Non-operating: 10% to 90% (non-condensing)
Altitude	Operating: Up to 3000 m (9842 ft) Storage: Up to 12 km (39,370 ft)
Shock	Operating: 20 g, 6 ms, half-sine Non-operating: 33 g, 11 ms, half-sine, 3/eg Axis
Vibration	Operating: 0.5 g sine, 0.4 grms random, 5 to 500 Hz  Non-operating: 2.0 g sine, 1.1 grms random 5 to 500 Hz
Heat dissipation	Maximum 22 ports: 590 BTU/hr
Airflow	Maximum 60 CFM; nominal 44 CFM
Power
Power supply	Dual hot-swappable redundant power supplies
Power inlet	C13
Input voltage	85 to 264 VAC nominal
Input line frequency	47 to 63 Hz
Inrush current	Maximum of 60 amps for period of 10 to 150 ms
Power	Nominal 145 watts; maximum 173 watts

Frequently Asked Questions:

Brocade extension switches and extension blades for Brocade director families are purpose-built, best-in-class extension platforms that provide a fast, highly reliable, and cost-effective network infrastructure to address today’s most demanding disaster recovery requirements. They enable organizations to improve resilience and maximize throughput for replication and backup operations over distance. These extension solutions also increase visibility into storage extension network health and the performance of data protection applications.

What extension solutions does Brocade offer?

To address disaster recovery requirements, Brocade offers a full extension solutions portfolio designed to give organizations flexible deployment options for replication. The Brocade 7840 and 7800 Extension Switches are designed for small to large enterprise environments. The Brocade SX6 and FX8-24 Extension Blades are integrated blade options for the Brocade X6 Director and Brocade DCX 8510 Backbone families, and are designed for high-density, large enterprise environments.

What is the Brocade 7840 Extension Switch?

The Brocade 7840 Extension Switch is a purpose-built extension solution that moves more data over distance faster while minimizing the impact of disruptions. With Gen 5 Fibre Channel, IP extension capability, and Brocade Fabric Vision technology, this switch delivers industry-leading performance, strong security, continuous availability, and simplified management to handle the unrelenting growth of data traffic between data centers. The Brocade 7840 accelerates performance over distance with up to 80 Gbps of FCIP throughput and up to 40 Gbps of IP extension throughput to meet stringent disaster recovery objectives. Twentyfour 16 Gbps Fibre Channel ports, sixteen 1/10 Gigabit Ethernet (GbE) ports, and two 40 GbE ports provide the bandwidth, port density, and throughput required for maximum application performance over WAN links for large, complex environments. Designed for maximum flexibility, this enterprise-class extension switch offers “pay as you grow” scalability with capacity on-demand upgrades. Organizations can quickly and cost-effectively scale from 20 Gbps to 80 Gbps application throughput per platform via software licenses to meet current and future requirements.

The Brocade 7840 base configuration is a bundle that includes a comprehensive set of advanced services: FCIP, IP Extension, Enterprise Bundle, Brocade Fabric Vision technology, Extension Trunking, WAN-optimized TCP, Adaptive Rate Limiting, IPsec, Compression, Open Systems Tape Pipelining (OSTP), Fast Write, Adaptive Networking, and Extended Fabrics. Optional value-add licenses for Integrated Routing (FCR), FICON CUP, and Brocade Advanced FICON Accelerator are available to address challenging extension and storage networking requirements in open system and mainframe environments.

What is the Brocade 7800 Extension Switch?

The Brocade 7800 is a rack-based solution that combines best-in-class Fibre Channel, FICON, and FCIP performance, “pay as you grow” scalability, and flexible deployment options for data centers and remote offices. Up to sixteen 8 Gbps Fibre Channel ports and six 1 GbE ports provide scalable bandwidth, port density, and throughput, extending and optimizing fabric connectivity over distance to support disaster recovery applications. Aggregate bandwidth of up to 128 Gbps for non-blocking Fibre Channel switching and up to 5 Gbps for FCIP provides class-leading performance and throughput. Dual redundant, hot-swappable power supplies with integrated fans maximize availability and minimize outages. In addition, the Brocade 7800 integrates seamlessly with the Brocade FX8-24, providing larger enterprises with a cost-effective solution to connect remote offices to a primary data center. Note: The Brocade 7800 Extension Switch and the Brocade FX8-24 Extension Blade are not interoperable with the Brocade 7840 Extension Switch.

Two models of the Brocade 7800 are available to address a variety of capacity, functionality, and cost objectives:

• The Brocade 7800 16/6 with sixteen 8 Gbps Fibre Channel ports and six 1 GbE ports maximizes connectivity for multi-site and point-to-point open systems disk and tape replication, as well as mainframe disk and tape applications over distance (Advanced FICON Accelerator).
• The Brocade 7800 4/2 with four 8 Gbps Fibre Channel ports and two 1 GbE ports provides cost-effective connectivity for two sites or point-to-point open systems disk replication (OSTP is not available on the 4/2 model), as well as mainframe disk and tape applications over distance (Advanced FICON Accelerator).

What is the Brocade SX6 Extension Blade?

The Brocade SX6 Extension Blade is a Fibre Channel and IP storage replication solution for the Brocade X6 Director family that moves more data over distance faster, delivers security without compromising performance, and scales to support the world’s most demanding environments. This blade provides the Brocade X6 Director with integrated metro and global connectivity for Fibre Channel and IP storage environments. With Gen 6 Fibre Channel, IP extension capability, and Brocade Fabric Vision technology, this solution delivers industry-leading performance, strong security, continuous availability, unmatched flexibility, and simplified operations to handle the unrelenting transfer of data between data centers. This enables storage and mainframe administrators to optimize and manage the use of WAN bandwidth, secure data over distance, minimize the impact of disruptions, and maintain SLAs.

The Brocade SX6 blade accelerates performance over distance with up to 80 Gbps of FCIP throughput and up to 40 Gbps of IP extension throughput to meet stringent disaster recovery objectives. The Brocade X6 Director can scale up to four Brocade SX6 blades per chassis. Each Brocade SX6 Extension Blade provides 16 32 Gbps Fibre Channel/FICON ports, 16 1/10 Gigabit Ethernet (GbE) ports, and 2 40 GbE ports, delivering the high bandwidth, port density, and throughput required for maximum application performance over WAN connections—and to meet the most demanding disaster recovery requirements.

The Brocade SX6 blade includes a comprehensive set of advanced services: FCIP, IP Extension, Enterprise Bundle, Brocade Fabric Vision technology, Extension Trunking, WAN-optimized TCP, Adaptive Rate Limiting, IPsec, Compression, Open Systems Tape Pipelining (OSTP), Fast Write, Adaptive Networking, Extended Fabrics, FICON CUP, and Brocade Advanced FICON Accelerator. An optional value-add license for Integrated Routing (FCR) is available to address challenging extension and storage networking requirements in open systems environments.

What is the Brocade FX8-24 Extension Blade?

The Brocade FX8-24, a blade-based solution designed for the Brocade DCX 8510 with Gen 5 Fibre Channel (16 Gbps), provides enterprise-class Fibre Channel and FCIP performance, availability, and security for primary and secondary data centers. Aggregate bandwidth of 96 Gbps for Fibre Channel switching and up to 20 Gbps for FCIP provide industry-leading performance and throughput for open systems and mainframe storage applications. Two optional 10 GbE ports, providing 10 Gbps FCIP connectivity, maximize available FCIP bandwidth and enable consolidation of 1 GbE ports. Up to four Brocade FX8-24 blades can be installed in a Brocade DCX 8510 chassis for simple expansion and enterprise data center reliability.

Do Brocade extension products support Brocade Fabric Vision technology? What are the benefits?

Brocade Fabric Vision technology is supported on Brocade extension products. Extending Brocade Fabric Vision technology between data centers provides unprecedented insight and visibility across the storage network. With its powerful integrated monitoring, management, and diagnostic tools, Fabric Vision technology enables organizations to minimize the impact of disruptions and outages for non-stop business operations. Consolidating Fibre Channel/FICON flows and IP storage replication flows into a single tunnel contributes significantly to operational excellence. And by using custom, browser-accessible dashboards for combined Fibre Channel and IP storage, storage administrators have a centralized management tool to monitor the health and performance of their networks.

Brocade extension products support many Fabric Vision technology features for storage extension. See Table 1A and 1B for details

Table 1A: Fabric Vision technology support by feature and product.

Standard Features	Brocade SX6 Extension Blade	Brocade 7840 Extension Switch	Brocade 7800 Extension Switch and Brocade FX8-24 Extension Blade
MAPS	Yes	Yes	Yes
Fabric Performance Impact (FPI) Monitoring	Yes*	Yes*	Yes
Dashboards	Yes	Yes	Yes
Flow Learning	Yes	Yes	No
Flow Monitoring	Yes*	Yes*	Yes, with some limitations
Flow Mirroring	Yes*	Yes*	No
Flow Generator	Yes*	Yes*	No
COMPASS	Yes*	Yes*	Yes
Forward Error Correction	Yes*	Yes*	No
Credit Loss Recovery	Yes*	Yes*	No
Brocade ClearLink Diagnostics (D_Port)	Yes*	Yes*	No

*Note: Unavailable on IP Extension at this time.

Table 1B: Detailed Fabric Vision technology features supported by Brocade extension products.

	Brocade 7800 Brocade FX8-24	Brocade 7840 Brocade SX6
Flow Generator	Pass (including passing through VE_Port) and receive, but does not generate Flow Generator traffic	Generate, pass (including passing through VE_ Port), and receive Flow Generator traffic
MAPS	Per circuit: Throughput, packet loss, and state change (circuit fencing is supported for state change)	Per tunnel/VE: Throughput, state change (VE fencing is supported for state change) Per circuit: RTT, jitter, throughput, packet loss, state change (circuit fencing is supported for state change) Per QoS (at tunnel level): Throughput, packet loss, RTT, jitter
Flow Monitor	Report IOPS and throughput per (SID, DID, LUN, SCSIRead/Write) flow (monitored on F/E_Port, LUN level; supported on F_Port only)	Report IOPS and throughput per (SID, DID, LUN, SCSIRead/Write) flow (monitored on F/E_Port; LUN-level supported on F_Port only)
Brocade Network Advisor FCIP SAN Extension Widget	Yes	Yes

What are the key platform features of the Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24?

The Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24 maximize replication and backup throughput over distance using advanced compression, disk and tape protocol acceleration for open systems and mainframe environments, and extension networking technology. Advanced features and technologies include:

• Extension Trunking: Creates logical tunnels spanning multiple physical ports for load balancing and network failure resiliency.
• IPsec support: Ensures secure transport over IP WAN links by encrypting data-in-flight with a standard 256-bit AES algorithm.
• Unparalleled, extremely efficient architecture: Uniquely permits the high-speed, low-latency processing of frames, making extension of synchronous applications possible.
• Adaptive Rate Limiting: Dynamically adjusts bandwidth limits to ensure efficient utilization and sharing of available bandwidth.
• Advanced compression architecture: Provides multiple modes to optimize compression ratios for various throughput requirements.
• WAN-optimized TCP: Optimizes TCP window size, flow control, fast retransmits, and slow starts, resulting in an accelerated TCP transport for storage applications.
• Fast Write (FCIP-FW): Accelerates SCSI write processing, enabling asynchronous disk replication over any distance.
• Open Systems Tape Pipelining: Accelerates read and write tape processing, minimizing backup and restore windows.
• Brocade Advanced Accelerator for FICON: Accelerates IBM z/OS Global Mirror (zGM, formerly known as eXtended Remote Copy, or XRC), mainframe tape read and write operations, and z/OS host connection to Teradata warehousing systems, maximizing performance over distance.
• PerPriority TCP Quality of Service (PTQ): Prioritizes flows within an FCIP tunnel to optimize bandwidth and performance by application with individual TCP sessions per QoS priority. There are three priorities for Brocade IP Extension flows and three separate priorities for FCIP flows.
• Seamless interoperability with Brocade SAN switches and Brocade Network Advisor: Simplifies deployment and administration.

What are the use cases for Brocade extension solutions?

Brocade extension solutions leverage cost-effective and sophisticated IP WAN transport to deploy high-performance disaster recovery and data protection solutions. They extend open systems and mainframe storage applications over distances that would otherwise be impossible, impractical, or too expensive with standard connections.

Both the Brocade 7840 Extension Switch and the Brocade SX6 Extension Blade are robust platforms for large-scale, multi-site data center environments implementing block, file, and tape data protection solutions. These solutions are unique in their ability to do FCIP and IP extension and are ideal for:

• Data protection for both open systems and mainframe
• Multi-site synchronous and asynchronous storage replication
• Accelerating IP storage across the WAN
• Operational excellence with converged bandwidth management of IP storage and FCIP across the WAN (includes MAPS and diagnostic tools)
• Enhancing the availability of FCIP and IP using Extension Trunking across multiple IP network paths
• Securing IP storage, Fibre Channel, and FICON data-in-flight across the WAN
• Centralized tape backup, recovery, and archiving for NAS, Fibre Channel, FICON, and IP-based backups
• Consolidation of replication IO from heterogeneous arrays and multiple protocols

Are the Brocade extension switches and blades compatible with each other?

The Brocade 7840 Extension Switch and Brocade SX6 Extension Blade do not support connectivity with the Brocade 7800 and Brocade FX8-24. However, the Brocade 7840 and Brocade SX6 on Brocade FOS 8.0.1 and above can be connected seamlessly via FCIP tunnels over WAN links, providing flexible deployment options to address scalability, performance, and cost requirements for multi-site extension. The Brocade 7840 and Brocade SX6 only connect via FCIP/IP extension to other Brocade 7840 switches and Brocade SX6 blades.

The Brocade 7800 and Brocade FX8-24 can also be connected seamlessly via FCIP tunnels over WAN links, providing flexible deployment options to address scalability, performance, and cost requirements for multi-site extension.

Do the Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24 interoperate with other Brocade Fabric OS switches?

Yes. The Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24 all utilize the same Brocade Fabric OS® (FOS) that supports the entire Brocade storage networking product family. This helps ensure seamless interoperability with advanced features such as Brocade Fabric Vision technology, Brocade Integrated Routing, and Brocade Extension Trunking.

Although the Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24 are compatible with current and previous generation Fibre Channel switches, the Brocade 7840 and Brocade SX6 do not support extension connections to the Brocade 7800 and Brocade FX8-24. The Brocade 7840 and Brocade SX6 can only connect to other Brocade 7840 and Brocade SX6 extension devices.

Are extension implementation services available through Brocade Professional Services?

Yes. Extension implementation services are available. As part of this service, a Brocade expert will assess the network and application environment, provide an estimated throughput of the extension link, and verify that requirements align with the available capabilities and resources. Brocade will then implement the specific configuration for connections between fabrics.

Who sells Brocade extension products?

Brocade extension solutions are available through traditional OEMs as well as VAD/VAR channels.

What are the key differences between Brocade switches and blades?

The Brocade 7840 and 7800 are switch form-factor extension products; the Brocade SX6 and Brocade FX8-24 are blade formfactor extension products for the Brocade director families. The Brocade 7840 requires Brocade FOS 7.3.0 or later, and the Brocade SX6 requires Brocade FOS 8.0.1 or later.

The Brocade 7840 and Brocade SX6 provide the following additional features:

• Unified support and management of both Fibre Channel/FICON and IP storage
• Extension Hot Code Load (eHCL), providing non-disruptive firmware upgrade support
• Fabric Vision technology features, such as Flow Generator support
• Increased maximum extension trunk bandwidth (VE_Port) to 20 Gbps (from 10 Gbps)
• Enhanced Adaptive Rate Limiting, which supports a ramp-up time that is 10 times faster and provides three transmission ratereduction behavior options based on WAN Round-Trip Time (RTT) and application sensitivity to latency (auto-mode recommended)
• Support for jumbo frames up to 9,216 bytes (IP MTU)
• Automatic path MTU discovery (PMTU)
• IPsec for IPv6
• WAN Test Tool (Wtool), which replaces Tperf on the Brocade 7800 and Brocade FX8-24

The following tables provide detailed hardware and feature comparisons of Brocade switches and blades.

Table 2: Brocade extension product comparison

Standard Features	Brocade SX6	Brocade 7840	Brocade FX8-24	Brocade 7800 16/6	Brocade 7800 4/2
Form factor	Blade	Switch	Blade	Switch	Switch
Fibre Channel/FICON ports	16 (32 Gbps)	24 (16 Gbps)	12 (8 Gbps)	16 (8 Gbps)	4 (8 Gbps)
1/10 GbE ports	16×1/10 GbE	16×1/10 GbE	10×1 GbE + 2×10 GbE	6×1 GbE	2×1 GbE
40 GbE ports	2	2	N/A	N/A	N/A
Maximum Fibre Channel/FICON throughput	80 Gbps	20 Gbps upgradable to 80 Gbps	20 Gbps upgradable to 40 Gbps	12 Gbps	6 Gbps
Maximum FCIP bandwidth (FCIP mode)	80 Gbps at 2:1 cmp (40 Gbps per DP)	80 Gbps at 2:1 cmp (40 Gbps per DP)	20 Gbps	6 Gbps	2 Gbps
Maximum FCIP bandwidth (hybrid mode)	40 Gbps at 2:1 cmp (20 Gbps per DP)	40 Gbps at 2:1 cmp (20 Gbps per DP)	N/A	N/A	N/A
Maximum IP extension bandwidth (hybrid mode)	40 Gbps (20 Gbps per DP)	40 Gbps (20 Gbps per DP)	N/A	N/A	N/A
Maximum bandwidth per VE_Port	20 Gbps	20 Gbps	10 Gbps	6 Gbps with optional FCIP Trunking	2 Gbps with optional FCIP Trunking
Maximum number of VE_Ports	10 default (20 Gbps max VE bandwidth) 20 (10 Gbps max VE bandwidth)	10 default (20 Gbps max VE bandwidth) 20 (10 Gbps max VE bandwidth)	20	8	2
High-throughput compression (Fibre Channel/FICON ingress, Note: IP extension is limited to Deflate and Aggressive Deflate)	Fast Deflate: 80 Gbps Deflate: 32 Gbps Aggressive Deflate: 20 Gbps	Fast Deflate: 80 Gbps Deflate: 32 Gbps Aggressive Deflate: 20 Gbps	Standard: 40 Gbps Moderate: 16 Gbps Aggressive: 5 Gbps	Standard: 12 Gbps Moderate: 8 Gbps Aggressive: 2.5 Gbps	Standard: 4 Gbps Moderate: 4 Gbps Aggressive: 2.5 Gbps
Non-disruptive firmware upgrade	Fibre Channel and FCIP	Fibre Channel and FCIP	Fibre Channel only	Fibre Channel only	Fibre Channel only
Integrated Routing (FCR)	Optional	Optional	Optional	Optional	Optional
IPsec (AES 256)	Included	Included	Included	Included	Included
FIPS	Included	Included	N/A	N/A	N/A
Fast Write (FCIP-FW)	Included	Included	Included	Included	Included
Open Systems Tape Pipelining (OSTP)	Included	Included	Included	Included	Requires upgrade to Brocade 7800 16/6
Storage-optimized TCP	Included	Included	Included	Included	Included
Quality of Service (PTQ, DSCP, 802.1P)	Included	Included	Included	Included	Included
Extension Trunking	Included	Included	Optional	Optional	Optional
Adaptive Rate Limiting	Included	Included	Optional	Optional	Optional
Advanced Accelerator for FICON	Included	Optional	Optional	Optional	Optional
FICON CUP	Included	Optional	Optional	Optional	Optional
MAPS	Included (tunnel, circuit and QoS levels)	Included (tunnel, circuit and QoS levels)	Optional (circuit level only)	Optional (circuit level only)	Optional (circuit level only)
Flow Monitor	Included	Included	Optional	Optional	Optional
Flow Generator	Included	Included	Not supported	Not supported	Not supported
Tperf/WAN Test Tool (Wtool)	Wtoo	Wtoo	Tperf	Tperf	Tperf

What are the key differences between the Brocade 7800 16/6 and Brocade 7800 4/2?

Both models of the Brocade 7800 leverage the same hardware and software platform. The Brocade 7800 16/6 Extension Switch is a robust platform for data centers and multi-site environments that are implementing disk and tape solutions for open systems and mainframe environments. The Brocade 7800 4/2 offers lower port density, select advanced features, and a lower price point— making it a cost-effective option for smaller data centers and remote offices that are implementing point-to-point open systems disk replication or mainframe zGM, tape, or Teradata warehousing applications. It does not include support for Open Systems Tape Pipelining. The Brocade 7800 4/2 can be easily upgraded to the Brocade 7800 16/6 through software licensing, providing scalability and investment protection for growing environments.

What optional extension features are available for the Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24?

A broad range of optional advanced extension, SAN fabric, and FICON services are available to address the most challenging extension and storage networking requirements in open systems and mainframe environments.

The Brocade 7840 Extension Switch includes:

• Enterprise Bundle
• Brocade Fabric Vision technology
• Advanced Extension License (Extension Trunking and Adaptive Rate Limiting)
• 10 GbE license (all 10 GbE interfaces are enabled)

The Brocade SX6 Extension Blade includes:

• Enterprise Bundle
• Brocade Fabric Vision technology
• Advanced Extension License (Extension Trunking and Adaptive Rate Limiting)
• 10 GbE license (all 10 GbE interfaces are enabled)
• Unlimited WAN rate (up to 40 Gbps)
• Advanced Accelerator for FICON
• FICON Management Server Control Unit Port (CUP)

Optional licenses include:

• Integrated Routing (FCR) license for all extension products: There are no VEX_Ports on the Brocade 7840 and Brocade SX6. This license enables EX_Ports for Fibre Channel Routing (FCR).
• Brocade 7840 optional upgrades: Enables “pay as you grow” scalability with capacity on-demand upgrades:
  • Brocade 7840 Medium Configuration (Base + WAN rate upgrade #1): Enables 10 Gbps WAN rate.
  • Brocade 7840 Maximum Configuration (Base + WAN rate upgrades #1 and #2): Enables two 40 GbE ports, unlimited WAN rate (up to 40 Gbps).
• Brocade 7800 4/2 Upgrade: Enables all ports and Open Systems Tape Pipelining.
• Brocade FX8-24 10 GbE Port Upgrade: Enables the two 10 GbE ports and optional 10 GbE port configurations.

Optional FICON services are available for the Brocade 7840, Brocade 7800, and Brocade FX8-24. These services address challenging extension and storage networking requirements in mainframe environments. They include:

• Advanced Accelerator for FICON: Enables high-performance FICON tape, zGM, and z/OS host connection to Teradata warehousing systems over distance.
• FICON Management Server: Control Unit Port (CUP) enables host control of switches in mainframe environments.

Optional advanced extension and SAN fabric services for the Brocade 7800 and Brocade FX8-24 include:

• Advanced Extension: Enables Extension Trunking and Adaptive Rate Limiting.
• Optional Brocade Fabric OS advanced fabric services: Enterprise Bundle, Brocade Integrated Routing (FCR), Brocade Fabric Vision, Brocade Extended Fabrics, and Brocade Extension Trunking.

What is required to enable the 40 GbE ports on the Brocade 7840 and Brocade SX6?

There is no license required to enable the 40 GbE ports on the Brocade SX6 blade. However, both WAN upgrade optional licenses are needed for the Brocade 7840 Extension Switch to enable the 40 GbE ports.

What is required to enable the 10 GbE ports on the Brocade FX8-24?

The optional 10 GbE ports are easily activated on a per-blade basis through a simple license upgrade to maximize FCIP bandwidth. Activating the 10 GbE ports on each blade doubles the aggregate bandwidth to a maximum of 20 Gbps and enables additional FCIP port configurations (ten 1 GbE ports and one 10 GbE port, or two 10 GbE ports).

What benefits will the new Brocade FX8-24 hardware SKU provide?

Brocade introduced a new Brocade FX8-24 hardware SKU to provide higher platform IPsec throughput. The new Brocade FX8-24 provides 20 Gbps IPsec throughput compared with 10 Gbps IPsec throughput on the original Brocade FX8-24 hardware SKU. No new license is required to enable higher IPsec throughput on the new Brocade FX8-24 hardware SKU. However, Brocade FOS 7.1 is required to enable the higher IPsec throughput. The new Brocade FX8-24 hardware SKU supports all previous Brocade FOS releases that support the current Brocade FX8-24 hardware SKU. When running any previous Brocade FOS release, the new Brocade FX8- 24 hardware SKU is no different than the original Brocade FX8-24 hardware SKU in terms of functionality

What is required to upgrade the Brocade 7800 4/2 to the functionality of the Brocade 7800 16/6?

The Brocade 7800 4/2 can be easily upgraded with a simple license upgrade to increase bandwidth and functionality. The upgrade license activates 12 additional Fibre Channel ports, four additional 1 GbE ports, six additional VE_Ports, and Open Systems Tape Pipelining.

Are Brocade optics required for the new switches?

Yes. The Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24 require Brocade-branded Small Form-Factor Pluggable (SFP) and Quad Small Form-Factor Pluggable (QSFP) optics.

Does Brocade offer a choice of SFPs?

Yes. The Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24 can use a variety of Brocade hot-pluggable SFP and SFP+ transceivers to support distance, xWDM, cable type, and port-speed requirements.

Is there a minimum version of Brocade FOS required for the Brocade SX6 Extension Blade?

The Brocade SX6 requires Brocade FOS 8.0.1 or higher.

Is there a minimum version of Brocade FOS required for the Brocade 7840?

Brocade 6510 and 6505 Switches support real-time power measurement, providing insight on power consumption in the fabric.

Is there a minimum version of Brocade FOS required for the Brocade FX8-24 and Brocade 7800?

The Brocade FX8-24 and Brocade 7800 require Brocade FOS 6.3 or higher.

Can I use the Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24 for Fibre Channel and IP extension?

The Brocade 7840 and Brocade SX6 support both Fibre Channel and IP extension. However, the Brocade 7800 and Brocade FX8- 24 support only Fibre Channel extension.

FCIP Technology

What is FCIP?

FCIP was designed as a simple tunneling protocol to link Fibre Channel over distance on standard IP networks. Used primarily for remote replication, backup, and storage access, FCIP provides Fibre Channel connectivity over IP networks between Fibre Channel devices or fabrics. FCIP leverages special high-speed and Big Data TCP/IP processing, which is essential for storage applications to be reliable and available, and maintain data integrity over long distance. Table 3 outlines how FCIP is designed and used.

	FCIP
Use case	Enables replication, backup, and storage access over long distance
Benefit	Moves more data faster and further for disaster recovery, data protection, and data mobility solutions
Network	WAN/MAN
Transport	FCIP/TCP/IP/Ethernet
Encapsulation	Brocade encapsulates Fibre Channel data sequences into compressed batches. Those batches fill TCP segments to their maximum size and then form IP datagrams.
IP-routable	Yes

IP Extension Technology

What is Brocade IP Extension?

Brocade IP Extension technologies help give storage administrators more control over their IP storage flows between data centers. There are five IP extension pillars: performance, operational excellence, enhanced availability, solid security, and easy deployment. IP Extension uses the same VE_Ports and circuits that FCIP uses, or it can use its own.

Brocade IP Extension is used primarily for IP storage applications, such as remote host-based or database-based replication, NAS replication, IP backups, and tape grids. It leverages special high-speed and Big Data TCP/IP processing, which is essential for storage applications to be reliable, available, and maintain data integrity over long distances. Table 4 outlines how Brocade IP Extension is designed and used.

Key advantages include:

• Brocade IP Extension proxies the local data center TCP sessions. This eliminates all latency effects and provides a clean, stable network that allows the end device to operate at its maximum performance. Brocade WAN-optimized TCP transports the data to the other data center, where another local TCP proxy communicates with the device on the other side.
• A multitude of IP storage flows is managed in a single tunnel so that the over-bandwidth usage across the WAN can be optimized and made more reliable. There is no way to optimize with rate limiting (or with other methods) a large number of individual autonomous flows across the WAN. Brocade IP Extension manages these individual flows using the TCP rwnd (Receive Window). Very large performance improvements have been demonstrated.
• The tunnel between data centers is optimized using Adaptive Rate Limiting, QoS, WAN-optimized TCP, and streams. WANoptimized TCP is an aggressive and sophisticated TCP stack that maintains data transport across the most adverse conditions. It can do what individual TCP stacks on end devices cannot do.
• Brocade provides operational excellence with tools such as Brocade Network Advisor, Monitoring Alerting Policy Suite (MAPS), and the latest versions of Brocade Fabric OS. The system provides Brocade Fabric Vision, Flow Generator, WAN Test Tool (Wtool), Extension Dashboard, and more—all the tools needed to diagnose issues in an extension network. IP networking administrators seldom make these tools available to storage administrators.
• Brocade IP Extension can transport all IP storage flows encrypted using IPsec. IPsec on the Brocade 7840 is a hardware implementation, which implies two important things: There is very little added latency (5 µs) when performing encryption, and the throughput of encryption is exceptionally fast (line rate).
• Brocade has taken into account deployment concerns for IP Extension. There is no need to re-cable, change IP subnets, or change VLANs. Only the IP gateway for the subnet(s) located at the remote data center need to be changed to the Software Virtual Interface (SVI) on the Brocade 7840. This SVI acts as the gateway for the IP storage traffic headed across the WAN. The Brocade 7840 provides Link Aggregation (LAG) to the data center LAN switch(es) to which the IP storage is connected. LAG delivers adequate bandwidth and link redundancy for high availability.

Table 4: Brocade IP Extension protocol.

	FCIP
Use case	Enables replication, backup, and storage access over long distance
Benefit	Moves more data faster and further for disaster recovery, data protection, and data mobility solutions
Network	WAN/MAN
Transport	IP Extension/TCP/IP/Ethernet
Encapsulation	Brocade encapsulates IP flow (also called “streams”) data sequences into compressed batches. Those batches fill TCP segments to their maximum size and then form IP datagrams.
IP-routable	Yes

What are circuits?

Circuits are the building blocks for trunks. A trunk is a tunnel with more than one circuit. A circuit consists of a source and destination IP address pair and per-QoS TCP connections. An Ethernet port can be assigned one or more circuits. Each circuit automatically creates multiple TCP connections that can be used for QoS prioritization. This is part of PTQ (PerPriority TCP QoS).

What is the impact of circuits on tunnels?

With the development of circuits, a tunnel is no longer bound to a single physical interface or a single connection to a peer Ethernet switch. The Brocade 7840 and 7800 Extension Switches and the Brocade FX8-24 Extension Blade create tunnels that are composed of one or more circuits, enabling Extension Trunking.

What is Extension Trunking and how does it work?

Extension Trunking is an optional licensed feature that enables the creation of logical high-bandwidth tunnels (“trunks”) composed of multiple circuits, and spanning multiple physical ports. Traffic within a trunk is balanced across all circuits to optimize bandwidth and performance. Trunks also overcome physical link failures with redundant paths, Lossless Link Loss (LLL), and guaranteed in-order data delivery.

The number of tunnels is synonymous with the number of VE_Ports. VE_Ports are the endpoints of a tunnel. The Brocade 7840 and Brocade SX6 support up to 20 tunnels in FCIP mode and up to 10 tunnels in hybrid (IP Extension) mode. Up to 20 tunnels are supported on the Brocade FX8-24. Up to eight tunnels are supported on the Brocade 7800. The Brocade FX8-24 provides up to 10 Gbps bandwidth for a single trunk using either 1 GbE ports or the optional 10 GbE ports. The maximum trunk size using the 1 GbE ports is 10 Gbps on the Brocade FX8-24, and 6 Gbps on the Brocade 7800. On the Brocade 7840 and the Brocade SX6, the maximum extension trunk size supported is 20 Gbps, and up to two such trunks can be configured per Brocade 7840 or Brocade SX6 when the maximum WAN rate is enabled.

What is Brocade Adaptive Rate Limiting and how does it work?

Adaptive Rate Limiting is an optional licensed feature on the Brocade 7800 Extension Switch and Brocade FX8-24 Extension Blade, and is included on the Brocade 7840 and Brocade SX6. It dynamically adjusts shared bandwidth between guaranteed minimum rates and available maximum rates for each circuit within a trunk. This overcomes the problem of fixed provisioning of bandwidth, which leads to over-provisioning and underutilization of links. Adaptive Rate Limiting enables applications to exceed guaranteed minimum rates when competing bandwidth dissipates.

What is PTQ (PerPriority TCP QoS) and how does it work?

PTQ extends Brocade Fabric OS QoS across extension links by putting those traffic flows into dedicated WAN-optimized TCP sessions for each priority. The extension blade or switch prioritizes traffic as high, medium, or low on a per-flow basis within a tunnel to optimize bandwidth by application. QoS is enforced only when congestion occurs at egress from the extension blade or switch. FCIP QoS integrates seamlessly with Brocade Fabric OS QoS for consistency throughout the entire fabric. IP Extension QoS operates the same way with the same priorities (high, medium, low) and is separate from FCIP QoS. There are seven priorities altogether: four for FCIP (including class-F) and three for IP Extension.

What is Brocade Integrated Routing (FCR)?

Integrated Routing (FCR) is an optional licensed feature that leverages the latest Brocade ASIC technology to provide Fibre Channel routing on a per-port basis. Because a Fibre Channel E_Port can be made to act as an EX_Port, data can be communicated between fabrics while maintaining remote fabric isolation. Integrated Routing (FCR) eliminates the need for a dedicated router or consumption of chassis slots with special routing blades—thereby reducing cost, complexity, and management overhead.

Mainframe Technology

Does Brocade support mainframe solutions?

Brocade provides as much as 95 percent of the total extension infrastructure used by the mainframe market, which includes FICON, ESCON, and bus and tag equipment for local switching or remote business solutions. With more than 20 years of experience and thousands of customers around the globe, Brocade offers valued products and services to help organizations meet their critical business objectives.

What is FICON?

FICON is an IO protocol used between IBM (and compatible) mainframes and storage arrays. It takes the higher-layer ESCON protocol and maps it into a Layer 2 transport frame. It is mapped into the same physical layer and framing specifications as Fibre Channel but is unique to the FICON protocol. FICON and Fibre Channel protocols can reside within the same switching infrastructure.

What Brocade products support FICON extension solutions?

The Brocade 7840 and 7800 Extension Switches and the Brocade SX6 and FX8-24 Extension Blades provide unique solutions for mainframe storage applications, including FICON disk emulation for IBM z/OS Global Mirror (zGM), also known as XRC (Extended Remote Copy), as well as FICON Tape Pipelining for write and read operations for IBM and Oracle virtual and standalone tape offerings.

What licenses are required for FICON functionality?

For Brocade Fabric OS fabrics, all functional capabilities required to support FICON are included in the base release. Optional FICON features separately licensed for the Brocade 7840 and 7800 Extension Switches and the Brocade FX8-24 Extension Blade include:

• Brocade Advanced Accelerator for FICON: Enables high-performance FICON tape and zGM replication over distance.
• Brocade FICON Management Server: Control Unit Port (CUP) enables host control of switches in mainframe environments.

What is CUP (FICON Management Server)?

Control Unit Port (CUP) is an in-band management function that enables mainframe applications to perform configuration, monitoring, management, and statistics collection functions. Several IBM mainframe management applications require CUP functionality on FICON backbones, directors, or switches. The Brocade FICON Management Server license enables CUP functionality.

Do the Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24 provide ESCON and bus and tag support?

Yes. These products support z/OS host connectivity to ESCON and bus and tag devices via external Optica Prizm (and ESBT) for FICON initiator to ESCON (and bus and tag) target protocol conversion. The solution provides extension for legacy ESCON and bus and tag tape controllers and select printers. ESCON and bus and tag disk are not supported.

What FICON data rates are supported?

Brocade supports FICON at the data rates consistent with industry standards. Host and storage interfaces supported include 1, 2, 4, 8, 16, and 32 Gbps FICON interfaces.

Can FICON be intermixed with open systems?

Yes. Brocade Virtual Fabrics is supported on the Brocade 7840 with Brocade FOS 7.3, the Brocade SX6 with Brocade FOS 8.0.1, and the Brocade 7800 and Brocade FX8-24 through Brocade FOS 7.0 and 7.1, respectively. Brocade Virtual Fabrics allows fabrics that are each configured with specific characteristics for open systems or z/OS environments to share the same platform—and even the same Ethernet interface—enabling consolidation while providing traffic isolation in mixed environments. The Brocade 7840 with Brocade FOS 7.3 or later and the Brocade 7800 with Brocade FOS 7.1 or later support up to four logical switches/two CUP instances. The Brocade SX6 with Brocade FOS 8.0.1 and the Brocade FX8-24 with Brocade FOS 7.0 or later support up to eight logical switches/four CUP instances.

Extension Management

What management tools are available for the Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24?

Management and administrative operations can be performed through familiar Brocade management tools, including Brocade Network Advisor, Brocade Web Tools, and the Command Line Interface (CLI). Moreover, optional FICON CUP capabilities enable IBM mainframe management applications to seamlessly support Brocade FICON environments (only available in the Enterprise edition of Brocade Network Advisor).

Is Brocade Network Advisor required to manage the Brocade 7840, Brocade 7800, Brocade SX6, and Brocade FX8-24?

No. However, Brocade Network Advisor does include the following enhanced FCIP management capabilities that help simplify and unify management of extension network infrastructures:

• View health and performance indicators in customizable browser-accessible dashboards, saving administrative time and effort
• Quickly perform root-cause analysis with point-in-time playback to discover and resolve network issues
• Provide a comprehensive topology view of all tunnels and trunks across all fabrics discovered by Brocade Network Advisor
• Simplify tunnel and trunk configuration and management with a wizard interface
• Drill down through the topology or dashboards to view and configure connection and switch properties

Is there a minimum version of Brocade Network Advisor required for the Brocade 7840 and Brocade SX6 extension products?

Brocade Network Advisor 12.3 or above is required to manage the Brocade 7840. Brocade Network Advisor 14.0.1 or above is required to manage the Brocade SX6.

Documentation:

Download the Brocade 7800 Extension Switch Datasheet (PDF).