A per trunk set of four DIP switches provides the default setting for operational modes. Switch set S9 is used for Trunk 0. Switch set S15 is used for Trunk 1.
General purpose switch settings:
Switch Description S9/S15 Switch Setting
1 Framing Mode OFF - ESF ON - SF
2 Yellow Alarm Method OFF - FDL ON - Digit2
3 Zero Code Suppression Mode OFF - B8ZS ON - AMI
4 Unused OFF
Trunk interface switches
Transmission Mode
A per trunk switch provides selection for T1 transmission.
Description S4/S10 Switch Setting
For future use. OFF
T1 ON
Line Build Out
A per trunk set of three switches provides selection between 0, 7.5 or 15 dB values.
Description Switch Setting
S5/S11 S6/S12 S7/S13
0 dB OFF OFF OFF
7.5 dB ON ON OFF
15 dB ON OFF ON
Trunk interface receiver impedance switch settings:
Description S8/S14 Switch Setting
75 ? OFF OFF ON OFF
100 ? ON OFF OFF ON
120 ? OFF OFF OFF ON
Ring ground switches
A set of four DIP switches selects which Ring lines are connected to ground.
Switch Description S2 Switch Setting
1 Trunk 0 Transmit OFF - Ring line is not grounded ON - Ring line is grounded
2 Trunk 0 Receive OFF - Ring line is not grounded
ON - Ring line is grounded
3 Trunk 1 Transmit OFF - Ring line is not grounded
ON - Ring line is grounded
4 Trunk 1 Receive OFF - Ring line is not grounded
ON - Ring line is grounded