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D-8 Cisco BPX 8600 Series Reference
Operation
Through the self test, all LEDs light up. 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 D-5.
Table D-5 Alarm Handling
Remote Loop Operation
The AT3-6ME has the capability of creating a remote loop on both the T3 and the T2 sides for test
purposes. The loop can be activated by manually 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, one must first enable the proper DIP switch on SW-1. Then
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 it can be removed by operating the loop switch a second time or it will
automatically remove itself after one hour.
Terminal Operation
The system is designed to operate without a terminal. There is a terminal interface designed for
diagnostics and maintenance purpose only. The terminal interface is always active and continuously
displays the user prompt. The terminal interface operating parameters are as follows:
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
Electrical Interface: RS232
DTE/DCE: DCE
Speed: 9.6 Kbps
Handshake: NON
Connector: Male DB9