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Initial Startup and Configuration
3-8
7975-A2-GB20-40
December 1998
Switchpack Definitions
Manually change configuration options by moving Switchpack S1 DIP switches
on the card. Table 3-1 lists Switchpack S1 definitions.
Table 3-1. Switchpack S1 Definitions
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 3-2, 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 1Mbps units)
Use Table 3-2 to set the Sync Port Payload Rate. Defaults are shown in bold.
NOTE:
Sync Port and DSL Line Rates can only be selected from units configured as
LTU (Switchpack S2 #1) with AutoRate disabled (Switchpack S2 #2).