Table 3-1. Setting The 400Em Module Dip Switches; Table 3-2. Sample Dip Switches For The 400Em Module - AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual

Lines and Trunks
Table 3-1, Setting the 400EM Module DIP Switches
Ports
2
1

Table 3-2. Sample DIP Switches for the 400EM Module

Ports
1 and 2
3 and 4
Tie-Trunk Signaling
Tie trunks transmit via three different signaling formats, each made up of a
specific mode and a specific type.
The dual in-line packaging (DIP) switches on the 400EM module select the
signaling modes needed for tie-trunk transmission; the signaling type is
selected during system programming.
Signaling Modes
There are two signaling mode:
Simplex mode. Two signaling leads superimposed onto the analog
transmission leads provide a 2-pair wire interface for connecting two
local systems at minimal cost.
E&M Mode
1
2
4
3
4
5
6
7
3
8
9
10
E&M Signal Switches
1C
Set all switches to
Default: no action required
1S
E&M Signaling
DIP
Switch 1S (Default)
Position Unprotected
E&M Mode Mode
ON OFF
ON OFF
OFF OFF
OFF OFF
OFF OFF
ON OFF
ON OFF
OFF
OFF
OFF OFF
OFF OFF
OFF
Type
1C
Protected
NA
NA
ON
ON
ON
NA
NA
ON
ON
ON
Tie Trunks 3-7