Maintenance-Object Repair Procedures
555-233-143
8-1432 Issue 1 May 2002
Remote EPNs
A DS1 converter complex can used to provide connectivity to a remotely located
port network. The DS1 converter complex consists of two TN574 DS1 converter
(DS1C) circuit packs connected by 1 to 4 DS1 facilities. The DS1C complex is
administered as a fiber link.
Figure 8-83. Fiber Link over a DS1 Converter Complex
SNI LEDs
The SNI circuit pack has red, green, and yellow LEDs. The red and green LEDs
have the usual meaning, with red signifying an on-board alarm, and green
signifying maintenance testing in progress. The red and green LEDs will come on
and then turn off when the circuit pack is reset.
NOTE:
If the red LED is on without any alarms active against the circuit pack,
replace the SNI circuit pack. This indicates that SNI firmware has detected
a fault and is unable to notify software.
The yellow LED indicates status information as follows:
SNI Yellow LED states
Condition LED on LED off
Fiber out of Frame 0.1 second 0.1 second
In frame, No Neighbor
1
1. The fiber is in frame but a communication problem exists to the
neighbor.
0.5 second 0.5 second
SNI active solid on never off
SNI standby never on solid off
metallic connection
or
optical fiber
metallic connection
or
optical fiber
1 to 4 DS1 Facilities
TN570 TN574 TN574 TN573
SNI
DS1C DS1C EI
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