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4.11.2. The Tapping Patch box
Purpose:
The tapping of signal cables in digital (TDM) telephone systems 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).
one
There is only
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
two
means that it will use
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).
two
There are up to
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".
78
INSTALLATION MANUAL APRESA
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