Cisco Systems 8600 Series manual Normal Operation, Remote Loop Operation, Terminal Operation

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
Alarms Passed Thru		Errors Relayed Thru
(both directions)		(both directions)
AIS		HEC Error—both directions.
RAI		BPV (up to 10-5rate)—6M to T3 only.
LOS
LOF

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:

Electrical Interface:	RS232
DTE/DCE:	DCE
Speed:	9.6 Kbps
Handshake:	NON
Connector:	Male DB9

D-8Cisco BPX 8600 Series Reference