Installing The Itw Linx Enhanced Protector; Installing The 4C3S-75 Enhanced Protector; Installing The Data Link Protector - Avaya MCC1 Installation And Upgrades

Install and Wire Telephones
Off-Premises Connections
Digital out-of-building voice terminals require protection at both building entrances. The 4C3S-75
Enhanced Protector and the ITW Linx Enhanced Protector can be used to protect digital voice terminals
and digital line circuit packs. These units provide primary and sneak current protection. The 4C3S-75 is
equipped with a heat coil for sneak current protection, and the ITW Linx is equipped with replaceable
fuses for sneak current protection.
NOTE:
The TN2181 16 Port Two-Wire Digital Line circuit pack may not be approved for some
out-of-building uses. Contact your Avaya representative for more information.
The 4C3S-75 may be used only with Vintage 14 or newer TN754C circuit packs.
Protectors on page 531 lists the approved protectors.
When possible, all new and reused wiring installations should use blocks that accept the standard 5-pin
plug-in 4C3S-75 protector. However, there are reused wiring installations where this may not be cost
effective. For these installations, the ITW Linx protector may be installed.
An example of this is where screw-type carbon block protectors — or other non plug-compatible
types — are in place and it is too costly to re-terminate the outside plant cable on a 5-pin
mounting block for only a few out-of-building terminals.

Installing the ITW Linx Enhanced Protector

The ITW Linx Enhanced Protector can be installed in series with existing primary protection. The ITW
Linx Enhanced Protector mounts directly on connecting blocks and requires a separate ground bar.

Installing the 4C3S-75 Enhanced Protector

The 4C3S-75 protector cannot be installed in series with other types of primary protection. It must be
installed as the only protection on the line entering the building. For the 4C3S-75 protector there are a
variety of 25-, 50-, and 100-pair protector panels equipped with 110-type connecting blocks and/or
RJ21X connectors.

Installing the Data Link Protector

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The maximum range for out-of-building digital voice terminals is 3400 feet when using 24 AWG (#5)
2
(0.5 mm ) wire and 2200 feet (670 m) when using 26 AWG (#4) (0.4 mm
extended to 5000 feet (1524 m) using 24 AWG (#5) (0.5 mm
2
(#4) (0.4 mm ) wire with the use of a data link protector. The protector is an isolating transformer used to
remove phantom power on the system side and re-introduce it on the terminal side.
When a protector is used, the voice terminal must be locally powered by an external power supply or
through the AC power cord provided with some of the 7400-type voice terminals. The protector is
installed on the equipment side of the protection in both buildings.
Refer to Figure 205, Example Adjunct Power Connections,
Trunk/Auxiliary Field,
530
on page 532.
Digital Voice Circuit
2
) wire. The range can be
2
) wire or 4000 feet (1220 m) using 26 AWG
on page 531 and Figure 206, Connections at
SI Installation and Upgrades
June 2004