AT&T Merlin Spezifikationen PDF herunterladen (Seite 20)

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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

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.

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

S25/S75/Definity

S85

Dimension

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

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

FAR END

MERLIN LEGEND

Protected/

SIGNALING MODE Unprotected

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

** Note: Plus a protection unit a little getting use to.

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