Customizing G.703-Compatible Units
4-5
7915-A2-GB20-20
September 1997
Making Changes in Switchpack Mode
When operating in Switchpack Mode, you change configuration options by
moving switches on the board hardware. Each switch in the switchpack controls a
configuration parameter. To enable Switchpack Mode, refer to
Switching Between
Terminal and Switchpack Modes
on page 3-2.
"
Procedure
To open the unit and make changes while in Switchpack Mode:
1. Power down the unit and remove the enclosure cover, exposing the circuit
board. Use electrostatic discharge (ESD) protection when handling the circuit
board.
2. Find the switchpack labeled S4. Refer to the board layout illustration in
Appendix C,
Switchpacks and Jumpers
.
3. Place the switchpack in the correct position for each desired configuration
option. The definition of each switch in the switchpack is also provided in
Appendix C,
Switchpacks and Jumpers
.
4. Replace the enclosure cover and power up the board to reset and enable the
new configuration.
Configuring Framed or Unframed Operation (G.703-to-G.703 Configuration)
In Switchpack Mode, switch 3 on switchpack S4 controls the selection of Framed
or Unframed. Switches 4–7 are unused in this configuration.
H
Framed: Switch 3 must be ON.
H
Unframed: Switch 3 must be OFF.
Configuring a Starting Time Slot (G.703-to-V.35/V.11 Configuration)
In Switchpack Mode, switches 3 – 7 on switchpack S4 determine the starting time
slot, as shown in
Table C-1
on page C-2.
If the payload rate (configured on the V.35/V.11-compatible unit) is 2048 Kbps, set
switches 3 – 7 all to the OFF position. This is the factory default.
If the payload rate is
less than 2048 Kbps, use switches 3 – 7 to select a starting
time slot (DS0). Make sure that there are enough subsequent time slots to
accommodate the V.35/V.11 payload rate (refer to the Maximum Payload Rate
column in
Table C-1
on page C-2). Contact your network administrator to verify
your starting time slot selection, as some time slots may already be in use.
