Instruction manual

Tie Trunks
2-42
Installation, SPM, Maintenance, and Troubleshooting Supplement
DIP switches 1, 2, 6, and 7 determine whether the tie trunks are
protected or unprotected. DIP switches 3, 4, 5, 8, 9, and 10 determine
the mode. Simplex mode is always protected. Therefore the
Protected/Unprotected settings for DIP switches 1, 2, 6, and 7 have no
effect.
The successful implementation of a tie trunk format is dependent upon
matching the characteristics of both PBX systems it connects. The
preferred signaling formats for a tie trunk originating in the system are
shown in Table 2-7.
Table 2-7. Signaling Formats for the 400 E&M Module
Installation
Situation
Preferred Signaling Format
From Local System System Distant Location
To
Distant
Location
Signaling
Mode/Type
Protected or
Unprotected
Signaling
Mode/Type
Protected or
Unprotected
MERLIN II Same
site co-
located
Type 5
Simplex
N/A Type 5
Simplex
N/A
System
25/75/85
or
DEFINITY
Same
site co-
located
Type 5
Simplex
N/A Type 5
Simplex
N/A
System
25/75/85
or
DEFINITY
Inter-
office
Type 5
Simplex
N/A Type 5
Simplex
N/A
Dimensio
n PBX
Same
site co-
located
E&M Type 1C
(Compatible)
Unprotected E&M Type
1S
(Standard)
Unprotected