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1 Install and cable a G600 cabinet
Install off-premises station wiring
126 S8100 Installation and Upgrades
November 2003
When possible, every new and reused wiring installation 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. For example, if screw-type carbon block protectors (or other
comparable plug-incompatible types) are in place, it may be too costly to re-terminate the outside 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, but 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 (0.26-mm
2
) wire
• 2200 feet (670 m) when using 26-AWG (0.14-mm
2
) wire
With the use of a data-link protector (an isolating transformer used to remove phantom power on the
system side and re-introduce it on the terminal side), the range can extend to
• 5000 feet (1524 m) using 24-AWG (0.26-mm
2
) wire
• 4000 feet (1219 m) using 26-AWG (0.14-mm
2
) wire
When using a protector, the voice terminal must be locally powered by an external power supply or
through the AC power cord provided with some of the 7400-series voice terminals. Install the protector
on the equipment side of the protection in both buildings.
See Table 3, Comcodes for equipment used with G600,
on page 63 for circuit protector and data-link
protector comcodes.
Table 19: Digital voice-circuit protectors
Circuit pack
Enhanced primary protector
(with sneak-current protection)
TN754B/any vintage 4C3S-75 or ITW Linx
TN2181 4C3S-75 or ITW Linx
TN2224B/any vintage 4C3S-75 or ITW Linx