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Configuration Option Tables
A-5 7520-A2-GB20-20 May 1998
Data Port Options Menu
For Data Port Options, refer to Table A-3. To access the Data Port Options
screen, follow this menu selection sequence:
Main Menu
→
Configuration (Load Configuration From)
→
Configuration Edit/Display
→
Data Port
Table A-3. Data Port Options (1 of 3)
DTE Port
Possible Settings: EIA232, V.35
Default Setting: EIA232
Determines the active DTE interface.
EIA232 – The EIA-232 port is the active DTE interface. Use for rates up to and including
19.2 kbps, and distances up to 50 feet.
V.35 – The V.35 is the active DTE interface. Use for all rates and distances up to
1,000 feet.
All the following Data Port Options apply to the interface selected.
Invert Transmit Clock
Possible Settings: Enable, Disable
Default Setting: Disable
Determines whether the DSU clock provided on Interchange Circuit CT114, Transmit
Signal Element Timing DCE source (TXC), is phase inverted with respect to
Interchange Circuit CT103, Transmitted Data (TXD). The feature should be enabled
when data errors are occurring due to long cable lengths.
Enable – The DSU-supplied clock is phase inverted with respect to the transmitted data
TXD.
Disable – The clock supplied by the DSU on TXC is normal (i.e., not inverted).
Port (DTE) Initiated Loopbacks
Possible Settings: Disable, Local, Remote, Both
Default Setting: Disable
Specifies whether the DTE can initiate and terminate local and/or remote loopbacks.
The DTE loopback control is done through the Interchange Circuits specified by the
V.54 standard.
NOTE: Refer to
Running Network Tests
in Chapter 5.
Disable – No local or remote loopbacks can be initiated by the DTE.
Local – A local loopback can be controlled by the DTE, via the Interchange Circuit LL
(CT141), as specified by V.54. The DTE port remains in loopback as along as LL
remains on. Aborting the loopback from the ATI has no effect.
Remote – A remote digital loopback can be controlled by the DTE, via Interchange
Circuit RL (CT140), as specified by V.54. The remote equipment must be able to detect
the in-band V.54 loopback sequence.
Both – Both the local and remote loopbacks can be controlled by the DTE.