User`s guide

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Table 15. Switchpack S4 Definitions – Model 7996
Switch # . . .
Allows you to . . .
Default in
Bold
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 STU-C.
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.
OFF = Framed
ON = Unframed
6 Enable CRC-4 generation and monitoring. Valid only for a unit
configured for Framed mode (Switch 5).
OFF = Disable CRC-4 generation and monitoring
ON = Enable CRC-4 generation and monitoring
7 Control whether Channel 16 contains signaling information or data.
Valid only for a unit configured for Framed mode (Switch 5).
OFF = Channel 16 is used for signaling (voice mode)
ON = Channel 16 is used for data (data mode)
8 Not used