21
7975-A2-GZ41-00
March 1999
Table 12 lists Switchpack S2 definitions.
Table 12.
Switchpack S2 Definitions
Switch # . . .
Allows you to . . .
Default in Bold
1
Control whether the unit is an LTU or an NTU.
OFF = NTU
ON = LTU
2
Control enabling and disabling of the AutoRate capability.
OFF = AutoRate Enabled
ON = AutoRate Disabled
3, 4, 5
Select one of eight preset DSL line rates (refer to Table 13).
All OFF = 2064
6
Control enabling and disabling of the first in, first out (FIFO) buffer
circuit (Elastic Store) for the incoming external clock.
OFF = Elastic Store Enabled
ON = Elastic Store Disabled
7
Not used
8
Emergency Use Only – The Hotwire 7975 has two banks of flash
memory used to hold executable firmware. This switch allows you to
switch between the two versions of firmware. This switch is
independent from the position of Switch 1 on Switchpack S1
(switchpack enable/disable).
OFF = Current Firmware
ON = Previous Firmware
Use Table 13 to set the DSL Line Rate. Defaults are shown in bold.
Table 13.
DSL Line Rate, Switches 3–5 on Switchpack S2
Switch Position
5
4
3
DSL Line Rate
OFF
OFF
ON
144 kbps
OFF
ON
OFF
272 kbps
OFF
ON
ON
400 kbps
ON
OFF
OFF
528 kbps
ON
OFF
ON
784 kbps
ON
ON
OFF
1040 kbps
ON
ON
ON
1552 kbps
OFF
OFF
OFF
2064 kbps
