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TABLE 3-B. Signaling Type Summary
SIGNALING
TRANSMIT
RECEIVE
TYPE
ON-HOOK OFF-HOOK
ON-HOOK
OFF-HOOK
I Std.
grd
bat open/bat (*)
grd
I Compat.
open/bat (*)
grd
grd open/bat (*)
V
open
grd open
grd
* An open circuit is preferred over voltage.
TABLE 3-C. TN760B Tie Trunk Preferred Signaling Formats
INSTALLATION SITUATION
PREFERRED SIGNALING FORMAT
SYSTEM 25
FAR END
CIRCUM-
SIMPLEX
PROTECTED
SIMPLEX
PROTECTED
FROM
STANCES
TO
OR SIGNAL
OR
OR
SIGNAL OR
E&M
TYPE UNPROTECTED
E&M
TYPE UNPROTECTED
S25 Co-
S25/S75
Simplex Type V
(Either)
Simplex
Type V
(Either)
Located
S25
Inter-
Building
S25/S75
Simplex
Type V
(Either)
Simplex
Type V
(Either)
S25
Co-
S85
Simplex
Type V
(Either)
Simplex
Type V
(Either)
Located
S25
Inter-
S85
Simplex
Type V
(Either)
Simplex
Type
V
Building
(Either)
S25
Co-
Dim.
E&M
Type I
Unprotected
E&M
Type I
Unprotected
Compatible
Standard
Building
S25
Inter-
Type I
Type I
Dim.
E&M
Protected
E&M
Protected
Building
Compatible
Standard
S25
Co-
Other
E&M
Type
I
Unprotected
E&M
Type I
Unprotected
Located
Compatible Standard
S25
Inter-
Type I
Type I
Other
E&M
Protected
E&M
*
Building
Compatible
Standard
Co-
S25
Network
E&M
Type I
Unprotected
(Don't
(Don't
(Don’t
Located
Interface
Standard
Care)
Care)
Care)
* Requires a protection unit.
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