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1152700 • Issue 1 • February 2001 • Section 2 Operations and Maintenance
Page 2-308
© 2000, ADC Telecommunications, Inc.
DLP-772
Page 4 of 4
CUSTOMER PREMISES EQUIPMENT
INPUTS
ACCESS
INTERFACE
CARD
BACKPLANE CELLBUS
CLOCKWISE
OPTICAL RING
INTERFACE
CARD
COUNTER-
CLOCKWISE
OPTICAL
RING
INTERFACE
CARD
1
2
3
4
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.
11729-D
Figure 772-3. Loopback Direction and Signal Flow Diagram