Instruction manual
FUNCTIONAL DESCRIPTION
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
Simplex
Protected
From Circum-
Simplex
Protected
Stances
To
or
Signal
or
or
Signal
or
E&M Type
Unprotected
(Note 1)
E&M Type
(Note 2)
(Note 1)
Unprotected
S25
Co- S25/S75
Simplex
Type V
(Either)
Simplex Type V
Located
(Either)
DEFINITY
S25
Inter-
S25/S75
Simplex
Type V
Building
DEFINITY
(Either)
Simplex Type V
(Either)
S85
S25
Co-
DEFINITY
Simplex Type V
(Either)
Simplex Type V
(Either)
Located
S25
Inter-
S85
Building
DEFINITY
Simplex Type V
(Either)
Simplex Type V
(Either)
Type I
S25
Co-
Dim.
E&M
Unprotected
E&M
Type I
Unprotected
Located Compatible
Standard
S25
Inter-
Dim.
E&M
Type I
Protected
E&M
Type I
Building
Compatible
Standard
Protected
S25
Co-
Other
E&M
Type I
Unprotected
E&M
Type I
Unprotected
Located
Compatible
Standard
S25
Inter-
Other
E&M
Type I
Type I
Building
Compatible Protected
E&M
Standard
(Note 3)
S25
Network
E&M
Type I
Unprotected
(Don’t (Don’t (Don’t
Interface
Standard
Care)
Care)
Care)
Notes:
1. Set by switches on Tie Trunk CP (Figure 3-16).
2. Set by System Administration of Port Options (Action 37).
3. Requires a protection unit.
3-29