1152700 • Issue 1 • February 2001 • Section 2 Operations and Maintenance
Page 4 of 4
COUNTER- CLOCKWISE OPTICAL RING INTERFACE CARD
1
2
CLOCKWISE OPTICAL RING INTERFACE CARD
BACKPLANE CELLBUS
3
ACCESS INTERFACE CARD
4
INPUTS
CUSTOMER PREMISES EQUIPMENT
1.LOOPBACK TOWARDS FACILITY ON AN OPTICAL CARD LOOPS INCOMING SIGNAL BACK OUT THE TRANSMITTING SOURCE. NO CHANGES ARE MADE TO THE INCOMING SIGNAL SECTION OR LINE DATA
2.OC12C CRS LOOPBACK TOWARDS THE TERMINAL LOOPS CELLS BACK TO THE CELLBUS.
3.LOOPBACK TOWARDS TERMINAL ON AN AIC SENDS CELLS BACK TO CELLBUS AND BACK OUT TO THE RING, NO CHANGES ARE MADE TO THE PATH LAYER DATA.
4.LOOPBACK TOWARDS FACILITY ON AN AIC CARD LOOPS THE INCOMING SIGNAL FROM CPE EQUIPMENT BACK TO THE CPE EQUIPMENT. AIC GENERATES AIS TO CELLBUS. A DS3 "PAYLOAD LOOPBACK" LOOPS THE SIGNAL BACK TOWARDS THE FACILITY AFTER FRAMING IS PERFORMED AND BEFORE BEING CONVERTED TO ATM.
Figure 772-3. Loopback Direction and Signal Flow Diagram
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© 2000, ADC Telecommunications, Inc.
