5. Testing
5-10
February 2001
8774-A2-GB20-40
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.
Activation and
Deactivation
Line
Loopback
Payload
Loopback
Remote Line
Loopback
In-Band Signal
Supported
Not Applicable
Not Supported
Bit-Oriented
Supported
Supported
Supported
Message-Oriented
Not Applicable
Not Supported
Not Applicable
CAP
DSL
Port
DSX-1
Port
CAP
T1
LIU
Framer
Framer
Transceiver
99-16252
All Ones
Telco
CAP
DSL
Port
DSX-1
Port
CAP
T1
LIU
Framer
Framer
Transceiver
99-16253
All Ones
Telco
Содержание Hotwire 8774
Страница 24: ...2 Using the Asynchronous Terminal Interface 2 10 February 2001 8774 A2 GB20 40 ...
Страница 62: ...5 Testing 5 12 February 2001 8774 A2 GB20 40 ...
Страница 68: ...6 Messages and Troubleshooting 6 6 February 2001 8774 A2 GB20 40 ...
Страница 100: ...D Technical Specifications D 2 February 2001 8774 A2 GB20 40 ...
Страница 110: ...Index IN 6 February 2001 8774 A2 GB20 40 ...