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32-8
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
Chapter 32 AT3-6ME (T3 to T2) Interface Adapter
Operation
Power-Up Sequence
During the system power-up, the unit goes through a 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.
Remote Loop Operation
The AT3-6ME can create a remote loop on both the T3 and the T2 sides for test purposes. You can
manually activate the loop by pressing a front-panel switch or through the control terminal. The
loopbacks are through looping relays at the two interfaces and they operate simultaneously.
To activate the loop from the front panel:
Step 1 Enable the proper DIP switch on SW-1.
Step 2 Press and hold the front panel push button for one second. This is to prevent accidental operation of the
loop.
Once the loop is set, you can remove it by operating the loop switch a second time. Otherwise it will
automatically remove itself after one hour.
Table 32-5 Alarm Handling
Alarms Passed Thru (both directions) Errors Relayed Thru (both directions)
AIS HEC Error—both directions.
RAI BPV(upto10
-5
rate)—6M to T3 only.
LOS
LOF