Cisco BPX 8650, Installation And Configuration Manual

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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 32 AT3-6ME (T3 to T2) Interface Adapter
Operation
Operation
This section describes the operating modes for the AT3-6ME. The unit is designed for unattended
operation. Any failures in the unit or any line alarms or errors are propagated.
Power-Up Sequence
During the system power-up, the unit goes through the following self test procedure:
•
The Power LED turns green.
•
The Active/ Fail LED stays off until the self test sequence is completed. Through the self test, all
LEDs light up.
• At the end of the self test the loop LED comes on for about 5 seconds.
•
When the test is completed successfully the Active/Fail LED turns green.
If the system fails self test, it will repeat the self-test twice more. If it continues to fail, the Active/Fail
LED turns red.
Normal Operation
In standard operation, the AT3-6ME system relays ATM cells from the T2 6M to the T3 interface. To
accommodate for the difference in the transmission rate, the AT3-6ME removes all null cells from the
T3 interface. The T3 sources connected to the AT3-6ME must regulate their ATM Cell rate not to exceed
the T2 6M cell rate. The AT3-6ME can absorb up to 70 cells in a single burst.
The AT3-6ME Interface Adapter can interface to any ATM UNI or NNI line at the T2 or T3 rate. The
AT3-6ME Relays alarms and errors from one interface to the other. It relays the alarm and error
conditions as indicated in Table 32-5.
Table 32-5 Alarm Handling
Alarms Passed Thru (both directions) Errors Relayed Thru (both directions)
AIS HEC Error—both directions.
RAI BPV (up to 10-5 rate)—6M to T3 only.
LOS —
LOF —