The Tapping Patch Box - Vidicode APRESA Series Installation Manual

5.11.2.

The Tapping Patch box

Purpose:
The tapping of signal cables in digital (TDM) telephone systems in order to feed the voice data simple
and reliable to the APRESA.
The APRESA is compatible with all major brands (Siemens, Philips, etcetera) in the field of digital PBX.
The APRESA TDM patch panel supports the passive tapping of up to 24 telephones lines.
Telephone line inputs are numbered 1,2,3....24 on the front of the patch panel. Each numbered
telephone line input consists of a set of 2 RJ45-type connectors, 1:1 wired for all 8 pins, effectively
eliminating the need for external "T"-splitters.
Every telephone line that needs recording must be routed over the Tapping Patch Box. This means that
the telephone line coming from the PBX must be plugged in the patch panel and that the other outlet for
that channel must connect the telephone. When this is done, all connected telephones should be able to
make calls as the tapping is fully passive.
The building wiring in modern offices for TDM telephony is just like the Ethernet wiring. This wiring
scheme is very well standardized, all connectors are RJ45 (=8-pin) and carry 4 balanced signal pairs on
PIN1/2, PIN3/6, PIN4/5 and PIN7/8.
When the telephone system uses 2-wire connection to the extensions, this means that it will use
one balanced pair (=2-wires) to establish the link with the PBX. Used pair is on the PIN4/5 and this is
the pair has the passive TAP to feed the APRESA recording channels. The remaining 3 balanced pairs
(3x2-wires) are of no concern for the data communication (and for the APRESA).
There is only one RJ21:RJ21 cable between the Patch Box and the APRESA.
When the telephone system uses 4-wire connection to the extensions, (like Basic rate ISDN) this
means that it will use two balanced pairs (=2x2-wires) to establish the link with the PBX. Used pairs are
on the PIN4/5 & PIN3/6 and these are the pairs having the passive TAPS to feed the APRESA recording
channels. The remaining 2 balanced pairs (2x2-wires) are of no concern for the data communication
(and for the APRESA).
There are up to two RJ21:RJ21 cables between the Patch Box and the APRESA. Per telephone one
need 2 APRESA recording channels.
> NOTE THAT THERE ARE 2 DIFFERENT RJ45 PATCH PANELS <
2-WIRE SYSTEM and 4-WIRE SYSTEM
ORDER THE CORRECT TYPE FOR YOUR INSTALLATION
A wiring diagram can be found in the chapter "Wiring TDM Telephony TAPS".
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