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5. Testing
5-10
February 2001 8784-A2-GB20-30
Telco-Initiated Tests
The Hotwire 8784 TDM SDSL Termination Unit supports Telco-initiated tests as
shown in the following table.
Telco-Initiated Line Loopback
The Hotwire 8784 Termination Unit 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 Hotwire 8784 Termination Unit supports 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 the 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
FramerFramerTransceiver
99-16252
All Ones
Telco
CAP
DSL
Port
DSX-1
Port
CAP T1
LIU
FramerFramerTransceiver
99-16253
All Ones
Telco