Zhone Technologies 600 - Manual (Page 32)

2-8 Server Cards
Model No. Running Head ACS-FRS Card User Screens and Settings FRS Card
The Events Counter (N393) allows you to select the window size for the number of events
(frames) in which errors will be counted. If error threshold (N392) is exceeded within cast
N393 frames, the link is declared down. The number of events counted are 1 to 10. The default
is 4.
The Full Status Frequency (N391) allows you to select the number of “keep alive” messages
(see T391 above) that should elapse before the full status inquiry message is sent. The number
of messages are 1 to 255. The default is 6.
ASYNC
This setting specifies whether a synchronous state's update messages are to be sent when
changes on the link occur. If set to no, link updates are sent at regular intervals, in response to
Full Status Requests.
CONG THRS
The Congestion Threshold allows you to select the amount (in percentage) that the internal Tx
queues on the port must be filled before declaring this port is congested (this information is
communicated by FECN and BECN flags). The options are 1 to 100.The default is 95.
Since DE (Discard-Eligibility) frames are not queued to the same extent as non-DE frames,
DE-frames may be dropped when mixed with non-DE frames on the same port before
congestion control is initiated.
To assure congestion control is initiated even for DE-frames under the conditions mentioned
above, the TX threshold value must be reduced sufficiently to match the percentage
DE-frames being buffered.