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In order to approach a.LEGEND system implementation with tie trunks it is really only necessary to know
which signaling formats are supported and to determine which of these supported formats are required. The
LEGEND system with the 400EM module supports Type 1 E&M Standard, Type 1 E&M Compatible, and
Type 5 tie trunks.
The transmit and control signals for each signaling type are:
TRANSMIT
RECEIVE
TYPE
ON-HOOK OFF-HOOK
ON-HOOK OFF-HOOK
Type 1 Standard
ground
battery open*/bat
ground
Type 1 Compatible
open*/bat
ground ground
open*/bat
Type 5 open
ground open ground
*
Note:
An open circuit is preferred over battery voltage.
A
S
its operation implies, the successful implementation of a tie trunk format will be dependent on matching
the characteristics of both of the switching systems it connects. The preferred signaling formats for a tie
trunk terminating in the MERLIN LEGEND system are:
TERMINATING SYSTEMS
FROM TO
DESCRIPTION
LEGEND
S25/S75/Definity
Co-located
LEGEND
LEGEND
LEGEND
LEGEND
LEGEND
LEGEND
LEGEND
LEGEND
LEGEND
S25/S75/Definity
S85
S85
Dimension
Dimension
OTHER
OTHER
LEGEND
MERLIN II
Inter-office
Co-located
Inter-office
Co-located
Inter-office
Co-located
Inter-office
Same site
interbuilding
Same site
interbuilding
NEAR END
MERLIN LEGEND
Protected/
SIGNALING MODE Unprotected
Simplex Type 5
Simplex Type 5
Simplex Type 5
Simplex Type 5
E&M Type 1 Crept Unprot
Type 1 Crept Prot
E&M Type 1 Crept Unprot
E&M Type 1 Crept Prot
Simplex Type 5
Simplex Type 5
FAR END
MERLIN LEGEND
Protected/
SIGNALING MODE Unprotected
Simplex Type 5
Simplex Type 5
Simplex Type 5
Simplex Type 5
-
E&M Type 1 Std
Type 1 Std
Prot
E&M Type 1 Std
Unprot
E&M Type 1 Std
**
Simplex Type 5
Simplex Type 5
** Note: Plus a protection unit a little getting use to.