Installation and Upgrades for DEFINITY ONE and
IP600 Internet Protocol Release 10
555-233-109
Issue 6
December 2001
Install and Cable the Cabinet
1-124Install off-premises station wiring
1
Digital out-of-building telephones
Use the following equipment to protect digital out-of-building voice terminals and
digital circuit line packs at both building entrances:
■ 4C3S-75 Enhanced Protector
■ ITW Linx Enhanced Protector
These units provide primary and sneak current protection. The 4C3S-75 is
equipped with a heat coil for sneak current protection while the ITW Linx is
equipped with replaceable fuses for sneak current protection.
Use the 4C3S-75 only with Vintage 14 or newer TN754 circuit packs. The
4C3S-75 can be used on all vintages of the TN754B circuit packs. The ITW Linx
may be used on all vintages of the TN754 circuit packs. Table 1-22 lists the
approved protectors.
NOTE:
The TN2181 (2-Wire 16 Port Digital Line circuit pack) may not be approved
for some out-of-building uses. Contact your Avaya representative for more
information.
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. 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.
Table 1-22. Digital voice circuit protectors
Circuit pack
Enhanced primary protector (with
sneak current protection)
TN754B/all vintages 4C3S-75 or ITW Linx
TN2181 4C3S-75 or ITW Linx
TN2224B/all vintages 4C3S-75 or ITW Linx
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