Installation guide

Wave Global Administrator Guide
Chapter 34
34. Trunk Settings
CHAPTER CONTENTS
Line Build Out settings
Line Build Out is a means of simulating additional cable length between a T-1 trunk’s
transmitter and the far-end receiver. This is done in case the signal being transmitted is too
strong. When the phone company deploys T-1 lines, each cable runs for 6000 feet before going
into a repeater to boost the T-1’s signal strength. When the T-1 line reaches its final destination,
the final span will generally not be exactly 6000 feet. Instead, the span length will be somewhere
between 0 and 6000 feet and average 3000 feet. If the final span is much less than the average,
the final repeater’s receiver will be much too close to the customer’s transmitter. The customer’s
transmitter signal will be too strong for the repeater to handle.
There are three FCC sanctioned signal levels that the customer can be asked to provide. They
are as follows:
•
0 dB. No artificial cable and therefore no reduction in signal strength
•
-7.5 dB. Puts the signal at 50 percent power
•
-15 dB. Puts the signal at 25 percent power
The customer provisioning letter will state what the Line Build Out (LBO) should be set at. If
the provisioning letter does not give an LBO value, then use the 0 dB default.
Line Build Out settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-1
Trunk timing values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34-5
Release 2.0
September 2010