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FINISAR INTRODUCES INTEGRATED TEST SYSTEM FOR FIBRE CHANNEL.

Finisar Corporation, Mountain View, Calif., has introduced Gigabit Traffic-Jammer to meet the needs of system designers and integrators for a robust, integrated tool to perform network conformance and reliability testing on Fibre Channel- based systems.

The first fully integrated test system, Gigabit Traffic-Jammer (GT-J) uses an advanced stimulus/response approach to verify error paths in Fibre Channel networks.

The GT-J can uniquely identify, then modify or replace any element of Fibre Channel traffic with an almost infinite variety of precisely controlled error conditions. It captures the original data, the modified data and the system response in trace memory for analysis.

"As the Fibre Channel protocol matures, system designers and integrators face some new challenges. Rather than implementation, testing for conformance and reliability is key," noted Ellis Goldberg, a Finisar spokesman. "A Fibre Channel network must handle valid traffic reliably, and respond to error conditions correctly," he continued.

Real-time error testing

Designers prove network reliability by testing each error path to verify that no error conditions cause data loss.

The ideal approach for testing network recovery from error conditions is to insert one and see if an error path functions as expected. GT-J takes this approach, determining conformance and reliability using a real-time stimulus/response system that can reliably insert valid and invalid traffic and monitor the results.

Until now, system designers and integrators were forced to make do with a collection of network components and custom hardware. The GT-J is a robust solution in a single instrument, with bi-directional data modification and two 254 Mbyte protocol trace analyzers for capturing both cause (the error condition) and effect (error path execution).

A full-duplex device, it is designed to be inserted into a network between Fibre Channel devices, such as between a host bus adapter and a bridge, hub, or loop. The GT-J is independent of DUT (devices under test) topology, operating equally well in point-to-point, loop, or fabric environments.

Data modification

The data replacement or modification process is called "jamming." Totally transparent to the devices under test, the jamming process can be performed at several levels, to a precise frame or primitive.

Whole frames, words within a frame, bits within words, and Ordered Sets may be changed. Bits may be forced high or low, or inverted from the original. Words may be replaced with user-specified words. The CRC may be replaced with a user-specified CRC or may be recalculated based on the newly corrupted payload.

Fibre Channel timing and disparity are maintained without generating code violations.

Event comparators determine which frames or primitives will be jammed. The comparators monitor both paths of a duplex link simultaneously. The comparators look for a specific traffic pattern (ARM term), then a specific traffic pattern to replace (JAM term).

A time qualifier resets the comparator to looking for ARM if the JAM condition does not occur within the allotted time. The ARM and JAM terms may be on different channels, the event comparators may be set to find Frames or Ordered Sets. The frame comparators are 128 bytes wide, including the SOF, Header and the first 25 words in the payload.

Data capture

The capture function has independent triggering and real time filtering for each trace analyzer. Captured traces are time correlated for display, search, post processing filter, and export with the Finisar TraceView application. TraceView runs on Windows NT or Windows 95 (both are trademarks of Microsoft Corp.) and is available at no charge.

The GT-J trace memory, consisting of four banks of 127 Mbytes RAM, captures all Fibre Channel data passing through the unit at full speed (greater than 106 MB/s per channel). The trace consists of over one second of data and includes the original data, the jammed data, and the network's response. Each trace memory bank has independent triggering and real time filtering capability.

The banks can be set to capture traffic prior to jamming and after jamming, capturing the jammed event, both before and after it has been corrupted. Captured data is compatible with the Finisar GT Protocol Analyzer data viewer and analysis software application.

GT-Jammer is priced at $125,000, including a high-performance PC with 21" monitor. Delivery is 45 days ARO.

For more information, please contact Ellis Goldberg, Finisar Corporation, 274 Ferguson Drive, Mountain View, CA 94043. Phone 650/691-4000, email sales@finisar.com or fax 650/691-4010. On the web, www.finisar.com.

Founded in 1988, Finisar Corporation develops and manufactures high-speed fiber optic components, network analyzers, and test equipment, including GBIC transceivers, protocol analyzers, data generators, and link extenders for Gigabit Ethernet and Fibre Channel networks.

For more information, call 415/434-4321.
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Publication:Computer Protocols
Date:Oct 1, 1998
Words:767
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