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3.12 Connection of Peripherals
216 Installation Manual
BGM/MOH
The PBX provides Background Music and Music on Hold. Up to 2 external music sources (e.g., user-
supplied radios) can be connected to the PBX.
CAUTION
• Wiring should be done carefully to prevent undue force being exerted on the plug. Otherwise,
sound may only be heard intermittently.
• External Music Jacks are SELV ports and should only be connected to approved SELV devices, or
in Australia, via the Line Isolation Unit with the Telecommunications Compliance Label.
Note
When the PBX and external music sources are not connected to the same earth, hum noise may be
induced into Background Music and Music on Hold.
Pager
Up to 2 paging devices (user-supplied) can be connected to the PBX.
CAUTION
External Paging Jacks are SELV ports and should only be connected to approved SELV devices, or in
Australia, via the Line Isolation Unit with the Telecommunications Compliance Label.
PC/Printer (via RS-232C)
The PBX is equipped with an RS-232C interface. This interface provides communication between the PBX
and the user-supplied devices such as PC or line printers. The RS-232C port is used for system
programming, SMDR, diagnostics and external system database storage (save/load) functions.
IMPORTANT
To protect the system, keep the following in mind:
1. Make sure that both connector cases (frame ground) of the RS-232C cross cable (shielded
cable) are conductive. If they are not conductive, make sure that both connector cases of
the cable are firmly connected.
2. If this is not possible, connect the frame of the PBX to the frame of the PC/Printer using an
earthing wire in order to prevent difference in the electrical potentials.
Pin Assignments
No. Signal Name Function
Circuit Type
EIA CCITT
2 RD (RXD) Receive Data BB 104
3
4
SD (TXD)
ER (DTR)
Transmit Data
Data Terminal Ready
BA
CD
103
108.2
5
6
SG
DR (DSR)
Signal Ground
Data Set Ready
AB
CC
102
107
7
8
RS (RTS)
CS (CTS)
Request To Send
Clear To Send
CA
CB
105
106
9 5
6 1