NEC Australia Pty Ltd
Xen Master & Xen Axis
5 - 168
Installing Electronic Telephone Units
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5.5.5
Connectors
The VMS(2/4/8)-U13 ETU has the following connectors:
✆
J9 connects to the backboard
✆
J1 (9-pin RS-232) is COM1 and is used for PC
Programming of the VMS(2/4/8)-U13 ETU. The PC
can be connected directly or via an external modem.
✆
J8 and J10 accommodation the DSP-F-21 Unit.
✆
J2 and J3 are not used.
5.5.6
Installation Precautions
The ETUs used in this system make extensive use of
CMOS technology that is very susceptible to static
electricity. Static discharge must be avoided when
handling ETUs. Always use the following precautions:
✆
Wear a grounding strap anytime you handle the ETU.
✆
Make all ETU DIP switch setting changes before
inserting it in the KSU. Ensure that Make Busy switch
is off.
✆
Carry ETU in a conductive polyethylene bag to
prevent static electricity damage.
5.6
FMS(2/4)-U13 ETU
5.6.1
Description
The FMS(2/4)-U13 ETU is a 2 or 4 port Digital Voice Mail
system.
This ETU is a PC platform installed in the Xen system and
contains Flash ROM space for voice recording storage and
application software. A digital signal processor/voice
processing section handles the following functions:
✆
DTMF detection
✆
DTMF generation
✆
General tone detection
✆
FAX CNG tone detection
✆
PCM compression for audio recording/playback
✆
Automatic gain control (AGC)
✆
A serial port capable of direct connect speeds up to
19.2 Kbps or for connecting external modem.
