Paradyne 7520, Руководство пользователя, Страница: 52 / 76

Configuration Option Tables
A-2
7520-A2-GB20-20 May 1998
System Options Menu
For System Options, refer to Table A-1. To access the System Options screen,
follow this menu selection sequence:
Main Menu
→
Configuration (Load Configuration From)
→
Configuration Edit/Display
→
System
Table A-1. System Options (1 of 2)
Operating Mode
Possible Settings: DDS, LADS
Default Setting: DDS
Determines the unit’s operating mode. The choice depends on the DSU’s application.
DDS – Standard DDS network operation.
LADS – The Local Area Data Set operating mode requires that the local and remote
units are connected directly to each other. This is a point-to-point application; also
known as LDM.
DDS Line Rate (Kbps)
Possible Settings: 2.4, 4.8, 9.6, 19.2, 38.4, 56, 64CC
Default Setting: 9.6
Sets the line speed for the DDS line.
DDS Line Rate (Kbps) option appears when Operating Mode is set to DDS.
2.4 to 56 – 2.4 to 56 kbps line rate.
64CC – 64 kbps Clear Channel on a 72 kbps circuit.
LADS Timing
Possible Settings: Internal, External, Receive
Default Setting: Internal
Determines the timing source for the unit.
LADS Timing option appears when Operating Mode is set to LADS.
Internal – Timing derived from the unit’s local clock. Use this setting for the LADS
primary timing unit that establishes the timing for both point-to-point units.
External – Timing is derived from the external clock provided by the DTE connected to
the V.35 interface on circuit CT113 (pins U, W).
Receive – Timing is derived from the line receive signal unless the unit is running
diagnostic tests. During the tests, the timing source is the internal clock. This setting
should be used for a LADS secondary timing unit.
LADS Line Rate (Kbps)
Possible Settings: 2.4, 4.8, 9.6, 19.2, 38.4, 56, 64
Default Setting: 9.6
Sets the line operating rate for LADS operation.
LADS Line Rate (Kbps) option appears when Operating Mode is set to LADS.
2.4 to 64 – DSUs communicate at this line rate.