ENIGMA XM88422 Digital Receiver
Version 1.50
10
Telephone Line Connections
Connect the telephone lines to the Line Cards LINE
modular jack with RJ11 4/6 pin modular cables. For
ISDN connection, use the 2 analog outputs of the
ISDN NT box.
The handsets for 2-way audio listen-in can be
connected to the modular jacks labeled HANDSET.
Ensure, that the handsets connected are off-hook,
because leaving the handsets on-hook will terminate
2-way Audio Mode. Measure the impedance of the
handsets to check, if the line will be terminated with
the proper impedance when switching to the handset.
On normal telephone lines, it should be around 600
ohms. When used in PBX system 2-way audio
communication needs bridging resistors with the
same value as measured on the handset. Using
improper termination the line will be dropped when
switched to 2-way Audio Mode
Grounding
To achieve the best resistance against static and
electric noise and electromagnetic interference (EMI)
connect the metal casing of the receiver to a
grounding point. Note that the grounding of the frame
has to be separate to the grounding of the Line Card
interfaces.
Proper grounding is essential also for the reliable
electric shock and lightning protection of the
telephone line interface of the Line Cards. Connect
the protective ground terminal of the Line Card
Module to a proper grounding point.
IMPORTANT:
Do not connect the protective ground
terminals directly to each other, or to the metal frame.
Connect the terminals to the grounding pole
individually with separate wires. NEVER connect the
protective ground to the power/signal ground of the
receiver!!!
Dual Line Card Module Backplane Connections
Handset for
2-way Audio
on Line 2
Phone Line 2
Phone Line 1
Handset for
2-way Audio
on Line 1
Protective Ground
Summary of Contents for XM88422
Page 1: ...User Manual ...
