User`s guide

27
NOTE:
Sync Port and DSL Line Rates can only be selected from a unit configured as the
STU-C (Switchpack S3 #1) with Auto Rate disabled (Switchpack S3 #2).
Table 13. Switchpack S4 Definitions – Model 7995
Switch # . . . Allows you to . . .
Default in
Bold
1 Enable or disable Switchpacks S3 and S4.
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. Valid only for a unit configured as the
STU-C.
OFF = Internal clock
ON = External Clock
4, 5, 6, 7, 8 Control Sync Port Data Rate. Sync Port rates are fixed except when
DSL Line rate is 200 Kbps. When the DSL Line Rate is 200 Kbps,
Sync Port Rates are 64, 128, 192 Kbps.
NOTE: Switches 4 through 8 are only used when the unit is
configured as an STU-C and Auto Rate is disabled (set to Fixed).
Switch Position
Sync Port Rate
Default in
Bold
87654
OFF OFF OFF OFF OFF 2048 Kbps
ON ON OFF OFF OFF 1536 Kbps
ON OFF OFF OFF OFF 1024 Kbps
OFF ON ON OFF OFF 768 Kbps
OFF ON OFF OFF OFF 512 Kbps
OFF OFF ON ON OFF 348 Kbps
OFF OFF ON OFF OFF 256 Kbps
OFF OFF OFF ON ON 192 Kbps
OFF OFF OFF ON OFF 128 Kbps
OFF OFF OFF OFF ON 64 Kbps