Table 3-3. Tie-Trunk Compatibility - AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual

Lines and Trunks

Table 3-3. Tie-Trunk Compatibility

Installation Situation
From system
Location
To
System Same site or
interbuilding
MERLIN II
System 25 Same site or
interbuilding
System 75
System 85 Same site or
interbuilding
or DEFINITY
Same site
Dimension PBX
Dimension PBX Interbuilding
Other Same site
Other Interbuilding
Network Interface
E&M Tie-Line Ports
The E&M tie-line circuit module provides four tie-line ports. These ports may be
individually configured for Type 1 Standard, Type 1 Compatible, or Type 5
(simplex or E&M).
Type 1 Standard is used to connect to the network. Type 1 compatible is used
to co-locate systems that have a Type 1 Standard interface. Type 5 is used to
connect co-located systems that have the Type 5 interface.
Table 3-4 shows the E&M option switch settings for the Type 1 Standard and
Type 1 Compatible tie-line modules.
Preferred Signaling Format
System
Protected or
Signaling Mode
and Type Unprotected
N/A
Type 5 Simplex
N/A
Type 5 Simplex
Type 5 Simplex N/A
E&M Type 1 Unprotected
Compatible
Protected
E&M Type 1
Compatible
Unprotected
E&M Type 1
Compatible
Unprotected
E&M Type 1
Compatible
Unprotected
E&M Type 1
Standard
Far End
Signaling Mode Protected or
and Type Unprotected
Type 5 Simplex N/A
Type 5 Simplex N/A
Type 5 Simplex N/A
E&M Type 1 Unprotected
Standard
E&M Type 1 Protected
Standard
E&M Type 1 Unprotected
E&M Type 1 Requires a
Standard protection unit
N/A N/A
Tie Trunks 3-9