Quick Eagle Networks DL3800E - Manual (Page 68)

4-28 DL3800E Inverse Multiplexer User’s Guide — July 9, 2001
4
Network Thresholds
This menu allows you to enable/disable the automatic FALLBACK feature
and set the various Network Alarm Thresholds that will cause the E1 lines
to automatically be taken out of service.
Figure 4-14 is an example of the NETWORK ALARM THRESHOLDS
configuration screen.
Suppress Yellow Detect This item allows you to configure the unit to ignore or report RAI alarm
conditions.
To change the present Suppress Yellow Detect, use the UP and DOWN
ARROW keys to highlight the item, and use the Space Bar to toggle
between Enabled and Disabled until the desired choice appears. Highlight
Confirm, and press the Enter key to confirm the change. (Default -
Disabled)
Second Error Restoral
Interval The second error restoral configuration is found on the Network
Configuration Screen on the DL3800E/3900s. Choices for configuration are
immediate, 5, 10, 15, 30 seconds and 1, 5, 10, 15 minutes. As seen from
previous discussions on fallback conditions, you should notice that it is
possible that an E1 will constantly go in and out of service on a flaky circuit.
Every time an E1 is taken out of service or put in-service this will
momentarily affect your traffic on the other E1s. In order to prevent this
problem second error restoral was created.
Second error restoral is a feature that will allow the Imux units to monitor a
bad E1 for a period of time after it has gone out of service and come back
on-line. Once an E1 has come back after the first out of service state has
occurred the Imux unit will monitor the E1 for the second error restoral
interval selected. If a second out of service state occurs during the
monitoring period the Imux unit will keep the E1 out of service (when the E1
is good again) for the SER time. Every time a new error occurs with in the
second error restoral period, when it is keeping the E1 out of service, will
restart the SER counter. Once the SER timer expires the E1 will be restored
and the process will start again. You can look SER like two strikes and your
out for E1s on Imux units.
Table 4-7 NETWORK CONFIGURATION MENU Options (Continued)
Parameter Description/Action