Wiring Analog Telephony (Pots) Taps - Vidicode APRESA Series Installation Manual

5.5.

Wiring ANALOG TELEPHONY (POTS) TAPS

GOOD EARTHING OF THE APRESA IS IMPORTANT FOR THE CORRECT OPERATION OF THE
ATP ANALOG INTERFACE CARDS. GOOD EARTHING IS MADE BY USING AN EARTHED WALL
SOCKET FOR THE MAINS SUPPLY.
The interface card that is used to make POTS taps is the ATP-card. See chapter 13.1 for the
specification and the connections of this type of interface card.
Wire taps of POTS-type telecom lines always involves two active wires per tapped telephone. For the
APRESA the polarity of the signal is irrelevant and can be ignored during wiring. The wiring-type used to
install the analog telephone system can very different as we see in the field:
• Old fashioned twisted pair;
Normally there are even 2 twisted pairs in the cable. The primary telephone is on the
RED/GREEN pair and the secondary telephone (if any) is on the BLACK/YELLOW pair.
• 4 wire modular cable with RJ11 modular plugs (RJ11=6P4C);
The inner 2 wires carry the signal of the primary telephone, while the outer two are used for the
secondary telephone (if any).
• 8 wire modular cable (CAT5) with RJ45 modular plugs and the possible use of (standard) patch
panels.
This cable type is preferred for all new installations because of low cross talk figures. The cable
contains 4 twisted pairs. Each twisted pair can connect a telephone. We see 1 or 2 telephones
on these cables in the field. Technically however this cable can connect 4 individual telephones.
The installation needed is straight forward as all POTS extensions that must be recorded must be
connected (by 2 wires) to an individual recording channel of the ATP interface card of the APRESA.
The analog/POTS wiring taps can be realized in 3 ways:
1. Direct wiring of the RJ21 connector of the interface card (pinning see above)
2. With the RJ11 patch box (POTS signal to pins 3&4,NO CONNECTION TO OTHER PINS !
3. With the RJ45 Tapping Patch box.
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