Switchpacks and Jumpers
C-2
7925-A2-GB20-30
PRELIMINARY DRAFT
June 1997
97-15266-02
P1
1
Switchpack S1
VT100 Terminal
Modular Jack
Jumper P11
S1
HDSL Line Jack
P9
P8
P12
P3
P10
P1
C31
C33
Position
1
2
3
4
5
6, 7
8
Settings*
OFF = CP
ON = CO
OFF = AMI line
encoding
ON = HDB3 line
encoding
OFF = Loops A and B
ON = Loop A
Must be OFF when
in Switchpack Mode
OFF = 75 ohm line
build-out
ON = 120 ohm line
build-out
Must be OFF when
in Switchpack Mode
OFF = Unframed
ON = Framed
6
7
8
ON
1
2
3
4
5
Pins*
1-2
2-3
Settings*
Terminal Mode
Switchpack Mode
Jumpers C31, C33
Pins*
1-2
2-3
Settings*
75 ohm line
build-out
120 ohm line
build-out
* Default in bold
P6
P7
Jumpers P6, P7
Pins*
1-2
2-3
Settings*
120 ohm line
build-out
75 ohm line
build-out
Figure C-1.
G.703-Compatible Unit Switchpack and Jumper Locations
Positions 4, 6, 7 on S1 must be OFF when in Switchpack Mode.
P6 and P7 must be placed in the same position (both 1-2 or both 2-3).
C33 and C31 must be placed in the same position (both 1-2 or both 2-3).
C33 and C31 may also be labeled P13 and P14.
Pin 1 on most jumpers is labeled on the board. However, Pin 1 on jumpers
C31 and C33 is the pin closest to the board edge.
The ON position is labeled on the switchpack.
