C-4
Preliminary cvMAX-100 Hardware Installation Guide
Cables and Connectors
T1 interface specifications
Note:
During loss of power or whenever the cvMAX-100 restarts, a relay closure returns the
T1 signal to the WAN. That is, the T1 line is looped back.
T1 cable specifications
The maximum cable distance between the T1 WAN interface equipment and the cvMAX-100
should not exceed 655 feet (200 m) for a cvMAX-100 without CSUs. Measure the line length
and record it when you install the cvMAX-100. You must specify this length when you
configure the Line N profile parameters. (For detailed information about parameters, see the
Reference Guide for the cvMAX-100.)
Use only cables specifically constructed for transmission of T1 signals. The cables should
meet standard T1 attenuation and transmission requirements. The following specifications are
recommended:
•
100 Ohm
•
Two twisted pairs, Category 3 or better
The WAN interface cables and plugs described in the following sections are available for the
cvMAX-100 unit’s WAN interfaces.
RJ-48C/RJ-48C T1 crossover cable
Install the RJ-48C/RJ-48C crossover cable when the WAN interface transmits on pins 5 and 4
and receives on pins 2 and 1. Figure C-1 and Table C-3 show the pinouts.
Figure C-1. RJ-48C/RJ-48C crossover cable
