Telco-Initiated Tests; Telco-Initiated Line Loopback; Telco-Initiated Payload Loopback - Paradyne Hotwire 8774 User Manual

5. Testing

Telco-Initiated Tests

The Hotwire 8774 TDM SDSL Termination Unit supports Telco-initiated tests, as
shown in the following table.

Telco-Initiated Line Loopback

The unit supports a 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 unit supports a Payload Loopback, as specified in AT&T TR 54016 and
ANSI T1.403. A Telco-initiated Line 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 loopback, and BPVs are removed.
5-10
Activation and Line
Deactivation Loopback
In-Band Signal Supported
Bit-Oriented Supported
Message-Oriented Not Applicable
CAP
DSL
All Ones
Port
Transceiver
CAP
DSL
All Ones
Port
Transceiver
February 2001
Payload
Loopback
Not Applicable
Supported
Not Supported
CAP T1
LIU
Framer Framer
CAP T1
LIU
Framer Framer
Remote Line
Loopback
Not Supported
Supported
Not Applicable
DSX-1
Telco
Port
99-16252
DSX-1
Telco
Port
99-16253
8774-A2-GB20-40