Switchpack Definitions For Model 7976 - Paradyne 7974 User Manual

Switchpack Definitions for Model 7976

7900-A2-GB21-00
Table 4-9 lists Switchpack S4 definitions.
Table 4-9. Switchpack S4 Definitions (Model 7976)
Switch # . . . Allows you to . . .
1 Enable or disable Switchpacks S3 and S4.
OFF = Switchpacks Disabled
ON = Switchpacks Enabled
2 Control line termination.
OFF = 120 Ohm
ON = 75 Ohm
3 Select the unit's primary timing source. Valid only for a unit configured
as the LTU.
OFF = Internal Clock
ON = External Clock
4 Control the unit's E1 line coding.
OFF = HDB3
ON = AMI
5 Determine whether the unit will use G.704 framing. Unframed mode
(ON) is valid only when switches 3–5 of Switchpack S3 are set to full
rate (all Off).
OFF = Framed
ON = Unframed
6 Enable CRC-4 generation and monitoring. Valid only for a unit
configured as the LTU. The NTU is automatically configured to match
the LTU setting.
OFF = Disable CRC-4 generation and monitoring
ON = Enable CRC-4 generation and monitoring
7 Control whether Channel 16 contains signaling information or data.
OFF = Channel 16 is used for signaling (voice mode)
ON = Channel 16 is used for data (data mode)
8 Not used
August 2000
Configuring the Unit Using the Internal Switches
Default in Bold
4-9