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C. Configuration Options
C-6
February 2001 3160-A2-GB21-90
EDL: Disab
Next Enab Disab Prev
Embedded Data Link. Specifies whether Embedded Data Link (EDL) is enabled for a
particular port. If EDL is enabled, then 8 kbps of the total bandwidth allocated for this port
is not available to the synchronous data port. For exampl“e, if the port rate is 256 kbps
(4 DS0 channels allocated) and EDL is enabled, then only 248 kbps is available to the
port. EDL provides the following: detection of frame synchronization, CRC of the data
stream (excluding the 8 kbps EDL), and an in-band data link (4 kbps) between the local
and remote units. The 4 kbps in-band data link can be used for performance report
messages and as an IP link for SNMP or Telnet sessions.
Enab
– Indicates the port’s EDL is enabled.
Disab
– Indicates the port’s EDL is disabled.
NOTES:
– This configuration option is only available on 2-port and 4-port DSU/CSUs.
– If the local DSU/CSU’s EDL is enabled, then the remote DSU/CSU’s EDL must also
be enabled.
– EDL is not recommended for networks in which data is examined for routing
purposes (e.g., frame relay, x.25).
Err Rate: 10E-4
Next 10E-4 10E-5 10E-6 10E-7 10E-8 10E-9 Prev
Port Excessive Error Rate Threshold. Sets the error rate threshold that determines when
an Excessive Error Rate (EER) condition is declared for a particular port. The error rate
selected by this configuration option is determined by the ratio of the number of CRC5
errors to the total number of bits received over a set period of time.
10E-4
– 10E-4 Threshold. For example, at 1536 kbps, EER is declared if more than
1,535 CRC5 errors are detected in a 10-second period. It is cleared with less than
1,536 errors in ten seconds.
10E-5
– 10E-5 Threshold. For example, at 1536 kbps, EER is declared if more than
921 CRC5 errors are detected in a 60-second period. It is cleared with less than
922 errors in sixty seconds.
10E-6
– 10E-6 Threshold. For example, at 1536 kbps, EER is declared if more than
92 CRC5 errors are detected in a 60-second period.
It is cleared with less than 93 errors
in sixty seconds.
10E-7
– 10E-7 Threshold. For example, at 1536 kbps, EER is declared if more than
9 CRC5 errors are detected in a 60-second period. It is cleared with less than 10 errors in
sixty seconds.
10E-8
– 10E-8 Threshold. For example, at 1536 kbps, EER is declared if more than
41 CRC5 errors are detected in three 15-minute intervals. It is cleared with less than
42 errors in three 15-minute intervals.
10E-9
– 10E-9 Threshold. For example, at 1536 kbps, EER is declared if more than
4 CRC5 errors are detected in three 15-minute intervals. It is cleared with less than
5 errors in three 15-minute intervals.
NOTES:
– This configuration option is only available on 2-port and 4-port DSU/CSUs.
– This configuration option is not available if EDL is disabled.
Table C-2. Port Configuration Options (4 of 5)