Switchpack Definitions For Model 7974 - Paradyne 7974 User Manual

Configuring the Unit Using the Internal Switches

Switchpack Definitions for Model 7974

4-4
Table 4-1 lists Switchpack S4 definitions.
Table 4-1. Switchpack S4 Definitions (Model 7974)
Switch # . . . Allows you to . . .
1 Enable or disable Switchpacks S3 and S4.
OFF = Switchpacks Disabled
ON = Switchpacks Enabled
2 Not used
3 Select the unit's primary timing source. Valid only for a unit configured
as the LTU.
OFF = Internal Clock
ON = DSX-1 Clock
4 Control the unit's T1 line coding.
OFF = B8ZS
ON = AMI
5 Control the unit's framing format
OFF = ESF
ON = D4
6, 7, 8 Control the unit's line equalization. Refer to Table 4-2. The three
switches form a binary value used as an index to the table of
equalization values. Off denotes 0 (zero) and On denotes 1 (one).
000 (all Off) = 0–133 feet
Use Table 4-2 to set the Line Equalization. Defaults are shown in bold.
Table 4-2. Line Equalization, Switches 6–8 on Switchpack S4 (Model 7974)
Switch Position
Line Equalization
8 7 6
OFF OFF OFF 0–133 feet
OFF OFF ON 133–266 feet
OFF ON OFF 266–399 feet
OFF ON ON 399–533 feet
ON OFF OFF 533–655 feet
ON OFF ON 0–133 feet
ON ON OFF 0–133 feet
ON ON ON 0–133 feet
August 2000
Default in Bold
7900-A2-GB21-00