27
Switchpack Definitions for Models 7975 and 7985
Table 14 lists Switchpack S1 definitions.
Table 14.
Switchpack S1 Definitions (Models 7975 and 7985)
Switch # . . .
Allows you to . . .
Default in Bold
1
Enable or disable Switchpacks S1 and S2.
OFF = Switchpacks Disabled
ON = Switchpacks Enabled
2
Control Sync Port Type.
OFF = EIA-530, RS-449, or X.21
ON = V.35
3
Select the unit’s timing source. Only valid for LTU configured units.
OFF = Internal clock
ON = External Clock
4, 5, 6, 7, 8
Control Sync Port Data Rate (refer to Table 15, Selectable Payload
Rates)
NOTE:
Switches 4 through 8 are only used when the unit is
configured as an LTU and AutoRate is disabled.
All OFF = 2048 kbps (1024 kbps for 1 Mbps units)
Use Table 15 to set the Sync Port Payload Rate. Defaults are shown in bold.
NOTES:
— Sync Port and DSL Line Rates can only be selected from units configured as
LTU (Switchpack S2 #1) with AutoRate disabled (Switchpack S2 #2).
— Sync Port Payload Rates above 960 kbps are available only on 2 Mbps
models. Payload Rate on 1 Mbps units defaults to 1024 kbps (all OFF).
