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S2(controls
Ports 3 and 4)
Port 4
Port 3
Switches
1 through 5
control Port 4
(E&M
unprotected)
Switches
6 through
I
o
control Port 3
(E&M
protected)
Port 2
Port 1
S1 (controls
Ports 1 and 2)
Switches
1 through 5
control Port 2
(simplex)
Switches
6 through
1
0
control Port 1
(E&M
FIGURE 3-5 Setting tie line module DIP switches.
Table 3-2 shows the switch settings you should use to set
the signaling mode of each port to E&M protected, E&M
unprotected, or Simplex.
WARNING:
The protected mode must be used
whenever the E&M leads extend out-of-building and
are not connected to the network interface. See pages
1-47 and 1-48
Administering a New System
3-51