Ds1 Network Interface Loopback Function - General DataComm 551 Operating And Installation Instructions

DS1 Network
Interface Loopback
Function
EQUIPMENT
FIGURE 4-3. DS1 NETWORK INTERFACE LOOPBACK FUNCTION
The DS1 Network Interface Loopback function, illustrated in Figure 4-3,
allows the signal received from the network to be looped back toward the
network at the DS1 Interface Connector (a Telco-provided connector in-
stalled on the network side intended to enhance maintenance operations).
This tests everything on the network side up to the DS1 Interface Connec-
tor.
When connected to a DS1 Interface Connector, the
DataComm 551 must be configured for manual Line
Build-Out, with 0 dB attenuation.
The DS1 Network Interface Loopback function can be activated and deac-
tivated remotely via the Supervisory terminal or by the Telco, using loop-
back codes as defined in Bellcore TR-TSY-000312.
The DS1 Network Interface Loopback function is not normally used
alone, but used in conjunction with DS1 Network Interface Loopback or
DS1 Network Interface Loopback with Self-Test.
CSU DS1 INTERFACE
CONNECTOR
CAUTION
T1
NETWORK
TESTS
EQUIPMENT
CSU
4-5