User`s guide

A. Configuration Options
7990-A2-GB20-00 May 2002
A-13
Line Framing
Possible Settings: CRC4, noCRC4
Default Setting: noCRC4
Specifies the framing format to be used by the G.703 interface.
Line Framing only appears when DSL Mode is set to STU-C (see Table A-6, System
Options).
CRC4 – CRC4 framing formatting is used for transmitted and received data over the
Network Interface.
noCRC4 – Non-CRC4 framing format is used for transmitted and received data over the
Network Interface.
Time Slot 16
Possible Settings: Signaling, Data
Default Setting: Signaling
Specifies whether the G.703 interface is used for voice or data.
Signaling – Time slot 16 is used for signaling (the unit is in voice mode).
Data – Time slot 16 is used for data (the unit is in data mode).
Send (AIS) on Network Failure
Possible Settings: Enable, Disable
Default Setting: Enable
Specifies the action taken on the signal transmitted to the G.703 when a valid signal
cannot be recovered from the network interface (LOS or OOF).
Primary Clock Source
Possible Settings: G.703, Internal
Default Setting: Internal
Specifies from where the unit derives its timing.
Primary Clock Source only appears when DSL Mode is set to STU-C (see
Table A-6, System Options).
Internal – The clock source is derived from the internal oscillator.
G.703 – The clock source is derived from the G.703 interface.
Table A-5. G.703 Interface Options – Model 7996 (2 of 2)