Remote Loopback; Remote Loopback With Bert; Figure 36. The Modem In Remote Loopback Operation; Figure 37. Remote Loopback With Bert - Canoga Perkins EdgeAccess Universal Chassis System 2361 T1 User Manual

The EdgeAccess Universal Chassis System

5.4.3 Remote Loopback

When activated, the Remote Loopback test will cause all data transmission from the local user
device to be looped back after the data Decoder/Encoder functional block in the remote modem.
The remote modem under local loopback will transmit AIS to T1/E1 Line Interface (See Figure
37).
LIU Logic
Rx
Tx

Figure 36. The Modem in Remote Loopback Operation

5.4.4 Remote Loopback with BERT

When activated, the Remote Loopback with BERT test will cause all data transmission from the
local user device to be looped back after the data Decoder/Encoder functional block in the remote
modem. An internal BERT is activated in the local unit which transmits a random pattern data at
payload rate to the remote end and detects the errors received (Figure 38). The remote modem
under local loopback will transmit AIS to T1/E1 Line Interface.
LIU Logic
GEN
QRSS
CHK
QRSS
AIS
5-6
Fiber
Optical
Link
Mux-
Enc
Demux-
Dec
Fiber
Optical
Link
Mux-
Enc
Demux-
Dec

Figure 37. Remote Loopback with BERT

2361 Modem Users Manual
Fiber Logic
Demux-
Dec
Mux-
Enc
Fiber Logic
Demux-
Dec
Mux-
Enc
LIU
Tx
AIS
Rx
LIU
Tx
AIS
Rx