The Fibre Channel option addresses all the transport layers by measuring the optical power level and supporting the
generation/analysis of bit errors, order sets, frame delimiters, frame transmission, and the generation of primitive sequences. User
defined bytes, fixed test patterns or industry-standard PRBS patterns can be selected and inserted into the payload field depending on
the test layer. Bit error, CRC error and Code violation insertion are useful features to verify Mux/Demux equipment for error monitoring
and detection.
Buffer-to-Buffer Credit Estimation
- To avoid loss of frames during transmission, the Fibre Channel protocol uses a buffer-to-buffer
flow control mechanism between link partners. During the login process, the remote node informs the local nodes as to the number of
receive buffers it has available. For each frame received, the remote port returns a R_RDY frame to indicate that one of the receive
buffers is now free - the local port in turn increments its available credit counter by one for each R_RDY acknowledgement frame it
receives. However, as the distance between nodes or link partners increases, so does the time it takes for the transmitting node to
receive the R_RDY frame because of signal propagation delay. The standard practice for a 1Gbps Fibre Channel link is to allow 1
buffer credit for each 2km of distance.
14.1 Setup
“Fibre Channel ” versus “Fiber Channel”
Confusing naming and spelling conventions have stuck with Fibre Channel during its development.
The word “channel” in no way indicates a preference for channel protocols or environments.
Even though “fibre” and “fiber” are semantically equivalent (“fibre” is the international English
spelling), “Fibre Channel” is the official spelling for the technology.
“Fiber” has come to mean more specifically the optical (glass) media used for long-distance (up to
10 km) connections.
14.1.1 Test Applications
After selecting the Fiber Channel test mode, the
Fiber Channel
main menu appears.
Note
: Depending on the test platform and installed module, availability of test applications and features may vary.
Fiber Channel Main Menu
The Fiber Channel Main Menu provides shortcut application buttons for FC BERT, FC RFC 2544, FC Throughput, FC Loopback, and
IP testing.
Some test capabilities or test rates may be specific to the product configuration or may require the purchase of a software option in
order to be displayed or enabled.
To configure ports and measurements, press
Setup
on the main menu.
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