Telco-Initiated Tests (Model 7974); Telco-Initiated Line Loopback; Telco-Initiated Payload Loopback - Paradyne 7974 User Manual

Telco-Initiated Tests (Model 7974)

The standalone Hotwire 7974 termination unit supports Telco-initiated tests, as
shown in the following table.

Telco-Initiated Line Loopback

The Model 7974 supports Line Loopback, as specified in AT&T TR 54016, AT&T
TR 62411, and ANSI T1.403. A Telco-initiated Line Loopback loops the received
signal on the DSX-1 interface back to the DSX-1 interface without modification.
Framing, CRC, and FDL bits are returned unaltered, and no BPVs or other line
coding errors are removed.

Telco-Initiated Payload Loopback

The Model 7974 supports Payload Loopback, as specified in AT&T TR 54016 and
ANSI T1.403. A Telco-initiated Payload Loopback loops the received signal on the
DSX-1 interface back to the DSX-1 interface. Framing, CRC, and FDL bits are
regenerated at the point of the loopback, and BPVs are removed.
7900-A2-GB21-20
Activation and
Deactivation Line Loopback
In-Band Signal Supported
Bit-Oriented Supported
Message-Oriented Not Applicable
CAP
DSL
All Ones
Port
Transceiver
CAP
DSL
All Ones
Port
Transceiver
December 2001
Payload Loopback
Not Applicable
Supported
Not Supported
CAP T1
LIU
Framer Framer
CAP T1
LIU
Framer Framer
8. Testing
Remote Line
Loopback
Supported
Supported
Not Applicable
DSX-1
Telco
Port
99-16252
DSX-1
Telco
Port
99-16253
8-19