C-6
MAX 3000 Installation and Basic Configuration Guide
Cables and Connectors
T1/PRI interface specifications
During loss or power, or any other time a MAX T1/PRI model resets, a relay closure connects
WAN 1 to WAN 3. This features protects the T1/PRI model’s drop-and-insert port (WAN 3)
from power interruptions and unit failures.
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 MAX Reference.)
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 ohms
•
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.
Line Buildout
0.0, 7.5, 15.0, or 22.5 dB
Pulse Density and Consecutive
Zeros Enforcement
In accordance with requirements of
AT&T Pub 62411
Line Loopback (LLB) Set Inband
Code
(10000) repeating binary pattern
Line Loopback (LLB) Reset Inband
Code
(100) repeating binary pattern
Table C-4. CSU specifications (continued)
Information
Value
