Interfaces and Connectible Terminals
105
S
0
Ports
All of the eight S
0
interfaces on the Forum 550 Card 8 S0/T0 interface card
are switchable, i.e. they can be used either for external connections (ISDN
basic access or a second PBX) or for internal connections (ISDN terminals). It
is not possible to use these interfaces simultaneously for both types of
connections.
The S
0
ports have been implemented as RJ45 sockets.
Pin assignment
S
0
interface pin assignment
The following table explains the S
0
interface pin assignment.
U
pn
2
Digital terminals (system telephones and DECT
base stations)
a/b
Analogue terminals:
telephones, G3 fax machines, (external or
internal) modems, external music-on-hold
devices, external voice mail systems, external
intercom systems
LAN
Connection to a LAN (local area network)
Connection of VoIP terminals
Pin number
Assignment
1
Not used
2
Not used
3
Send +
4
R
5
Receive -
Overview: Interfaces and connectible terminals
Interface
Terminals / systems
Page
1 2 3 4 5 6 7 8
+ + – –
Содержание Forum 500 Series
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