Model 7976 Switchpack Definitions - Paradyne 7974 User Manual

Model 7976 Switchpack Definitions

For Switchpack S4 definitions, refer to
(Model
Table 4-9.
7900-A2-GB21-20
7976).
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
December 2001
4. Configuring the Unit Using the Internal Switches
Table 4-9, Switchpack S4 Definitions
Default in Bold
4-9