C-6
Preliminary November 4, 1998
MAX 4000 Series Hardware Installation Guide
Cables and Connectors
T1/PRI interface specifications
Note:
During loss of power or whenever the MAX restarts, a relay closure returns the T1/PRI
signal to the WAN. That is, the T1/PRI line is looped back. However, if you configure the
MAX for framing-compatible drop-and-insert functionality, all channels of line #1 are passed
to line #2. Note that line #1 and line #2 of a MAX expansion module always loop back upon
loss of power, regardless of how they are configured.
T1/PRI cable specifications
The maximum cable distance between the T1/PRI WAN interface equipment and the MAX
should not exceed 655 feet (200 m) for a MAX without CSUs. Measure the line length and
record it when you install the MAX. You must specify this length when you configure the Line
N profile parameters. (For detailed information about parameters, see the Reference Guide for
the MAX.)
Use only cables specifically constructed for transmission of T1/PRI signals. The cables should
meet standard T1 attenuation and transmission requirements. The following specifications are
recommended:
•
100
Ω
•
Two twisted pairs, Category 3 or better
The WAN interface cables and plugs described in the following sections are available for the
MAX unit’s WAN interfaces.
