66-TYPE HARDWARE
NETWORK INTERFACES
RJ21X Network Interface
The RJ21X network interface is the connection point between the local telephone company
lines (1-pair trunks) and the system. The interface is supplied and installed by the local
telephone company.
RJ2GX Network Interface
The RJ2GX network interface is the connection point between the local telephone company
tie-trunks and the system 3-pair tie-trunks. The interface is supplied and installed by the
local telephone company.
1.544 Mbps Digital Service Interfaces
The 1.544 Mbps (Megabits per second) digital service interfaces are the connection points
between the local telephone company T1 carrier lines and the system DS1 tie trunks. The
interfaces are supplied and installed by the local telephone company.
SNEAK FUSE PANELS
575-4 Sneak Current Fuse Assembly
Sneak current protection is required between the RJ21X or RJ2GX network interface and the
switch. The Model 575-4 Sneak Current Fuse Assembly (Figure 4-8), or equivalent, can be
used for sneak current protection. The panel is connectorized in and out and equipped with
25 2-pair fuse modules. Connectorized (B25A) cables connect the network interface to the
sneak fuse panel. 157B Connecting Blocks equipped with SCP-1 Protectors may also be used
for sneak current protection.
SNEAK FUSE PANEL ORDERING INFORMATION
Description
Comcode
157B Connecting Block
403 613 003
Protector, SCP-1*
403 617 632
575-4 Sneak Fuse Current Assembly
xxxxxx
Fuse Module—25A
xxxxxxx
* The SCP-1 Protectors must be ordered separately and installed on the 157B Connecting Block. Twenty-four
protectors are required per block.
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