BGM/MOH
The PBX provides Background Music and Music on Hold. An external music source (e.g., user-supplied radio)
can be connected to the PBX.
CAUTION
The External Music Jack is an SELV port and should only be connected to an approved SELV device.
Notice
•Wiring should be done carefully to prevent undue force being exerted on the plug. Otherwise, sound
may only be heard intermittently.
•When the PBX and external music source are not connected to the same ground, hum noise may be
induced into Background Music and Music on Hold.
Pager
A paging device (user-supplied) can be connected to the PBX.
CAUTION
The External Paging Jack is an SELV port and should only be connected to an approved SELV device.
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.
When using special accessories such as cable, the user should use those specified in this installation manual
to comply with the limits for a Class B digital device pursuant to the FCC Rules.
CAUTION
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 a grounding
wire in order to prevent difference in the electrical potentials.

Pin Assignments

No. Signal Name Function
Circuit Type
EIA CCITT
9 5
6 1
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
102 Installation Manual Document Version 2011-10
3.10.1 Connection of Peripherals