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5.8.
Wiring ISDN E1/T1 Telephony TAPS
The interface card that is used to make E1/T1/J1 taps is the DTP-card. See chapter 13.3 for the
specification and the connections of this type of interface-card.
There are 2 different wiring approaches: the twisted pair type (RJ48C) and the coaxial type. The twisted
pair type of wiring is the commonly used wiring type. The diagram below shows the TAP installation. By
the RJ45 splitter both receive and the transmit pairs are fed to the DTP card.
ISDN T 1 /T 1/J1
ST A NDARD
E T HERNET CAB LE S
All cables used are twisted pair cables. Refer to the pinning of the DTP connector in the drawing for
signal reference. The cable between the RJ45 splitter and the APRESA should be less, then 20 meter in
length. This cable should be twisted pair and explicit NOT parallel pair cables that are commonly used
for ISDN basic rate installations.
It is always a good practice to keep the cable length between the splitter and the APREA as short as
possible. It is confirmed that in optimal configurations up to 20M will work, but in your situation the
signal quality at the splitter may have degraded already by long cabling or distortion. Too much framing
errors will occur and the APRESA stops recording this specific trunk. (Restart recording component to
recover from this situation)
INSTALLATION MANUAL APRESA
RJ45
T sp l i tter
<20M
COPYRIGHT © 2011-2017 VIDICODE ®
PB X
PB X
T WIST ED
T IP2
P AIR
8
CA BL E
RING2
7
6
5
4
3
2
1
T IP1
RING1
DWG1 15 6_ 00
DT P CARD
CONNE CT OR
55
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