ADTRAN Express 6500 Series Installation And Maintenance Practice page 24

SHDSL 2-Wire/4-Wire Line Terminating Unit (LTU) Installation and Maintenance Practice
Initiating Source
VT100 Remote Loopback OFF
Local Loop Pushbutton ON (Initiates a Local
Loopback per the associated port/service
Loopback Type Option setting.)
Local Loop Pushbutton OFF
Remote Loop Pushbutton ON (Initiates a
SHDSL Port Dual Sided Remote Loopback; or a
G.703 Single Service Remote Loopback per the
remote unit's associated service Loopback Type
option setting, if supported, and in the direction
of signal origination.)
Remote Loop Pushbutton OFF
Receive Inband Termination Signal
Receive V3 Loopback Bit ON (Initiates a Local
Loopback per the G.703 Port Loopback Type
option setting, and in the direction of V3 signal
origination.)
Receive V3 Loopback Bit OFF
1. The reception of in-band patterns and EOC loopback request messages may be ignored or blocked on certain
Total Access 3000s.
2. If connected to a remote unit that does not support the EOC proprietary message specification, then only the
EOC standard Customer and Network Loopback request bits are used. When either the Customer or Network
Loopback bit is set, the remote unit determines which loopback type that it implements (for example,
transparent or non-transparent).
18
Table 10. Loopback Test Summary (Continued)
Front Panel Pushbuttons
ISDN PRA V3 Reception
SHDSL Port G.703 Port
N/A
N/A
AIS
N/A
Sends N/A
Standard
EOC
Request
Message
N/A
N/A N/A
N/A
N/A
G.703 Service
N/A
Single
Service
Only
AIS
Single
Service
Only,
Sends
AIS
In-band
Signal
N/A
N/A
AIS
N/A
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