Avaya CMC1 manual Install Off-Premises Station Wiring

Install Off-Premises Station Wiring

Table 24: Digital Voice Circuit Protectors

Circuit Pack	Enhanced Primary Protector
	(With Sneak Current
	Protection)
TN754 V13 or earlier	ITW Linx Only
TN754 V14 or later	4C3S-75 or ITW Linx
TN754C all vintages	4C3S-75 or ITW Linx
TN2181	4C3S-75 or ITW Linx
TN2224CP	4C3S-75 or ITW Linx

When possible, all new and reused wiring installations should use blocks that accept the standard 5-pin plug-in 4C3S-75 protector. However, this may not be cost-effective in some cases. 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.

The ITW Linx Enhanced Protector may be installed in series with existing primary protection. Note 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, various 25-, 50-, and 100-pair protector panels are equipped with 110-type connecting blocks and/or RJ21X connectors. The ITW Linx Enhanced Protector mounts directly on connecting blocks and requires a separate ground bar.

The maximum range for out-of-building digital voice terminals is 3400 feet (1036 m) when using 24 AWG (#5) (0.26 mm2) wire and 2200 feet (670 m) when using 26 AWG (#4) (0.14 mm2) wire. The range can extend to 5000 feet (1524 m) using 24 AWG (#5) (0.26 mm2) wire or 4000 feet (1219 m) using 26 AWG (#4) (0.14 mm2) 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 Table 4: Comcodes for CMC1 on page 31 for circuit protector and data link protector comcodes.

Issue 10 June 2005 137