Z100-TYPE HARDWARE
NETWORK INTERFACES
RJ21X Network Interfaces
The RJ21X network interfaces are the connection points between the local telephone
company lines (1-pair trunks) and the system. The interfaces are supplied and installed by
the local telephone company.
RJ2GX Network Interfaces
The RJ2GX network interfaces are the connection points between the local telephone
company tie-trunks and the system three-pair tie-trunks. The interfaces are 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 2-12), or equivalent, is
recommended for sneak current protection. The panel is connectorized in and out and
equipped with 25 two-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 Current Fuse Assembly
xxxxxx
Fuse Module—25A xxxxxx
*
The SCP-1 Protectors must be ordered separately and installed on the 157B Connecting Block. Twenty-four
protectors are required per block.
2-15
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General