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5-4 Avaya P550R, P580, P880, and P882 Multiservice Switch User Guide, v5.3.1
Chapter 5
There are four flow control options on Gigabit Ethernet Ports.
■ Disable
■ Enable
■ Enable – Send Only
■ Enable – Respond Only
The "Disable" option disables flow control (the default).
The "Enable" option enables IEEE802.3X (XOFF/XON) Flow
Control on the line. The Avaya Multiservice Switch is the sender of
pauses based upon inbound traffic and the Avaya Multiservice
Switch is the receiver of pauses based upon outgoing traffic (and the
ability of attached equipment to use the protocol).
With Gigabit links, you can:
■ Enable IEEE802.3X for both send and receive (the “Enable”
setting)
■ Only send pause (XOFF/XON) signals (the “Enable – Send
Only” option)
■ Only respond to the pause signals (the “Enable – Respond
Only” option).
With 10/100 links you can use the "Enable with Aggressive Backoff"
option to enable Active Backpressure (creation of a collision) on a
link. Active Backpressure only applies to HD links so that when a
10/100 link is in FD, options 2 and 3 are identical.
Refer to Table 5-1 lists the gigabit modules that do not support auto
negotiation:
Table 5-1. Gigabit Modules not Supporting Autonegotiation
Gigabit Module Model Number Hardware Revision
M5502-1000SX-F M or earlier
M5502-1000LX-F M or earlier
M5502-1000SLX-F F or earlier
M5504-1000SX-F H or earlier
M5504-1000LX-F H or earlier
M5504-1000SLX-F H or earlier
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