Installation guide

Line Build Out settings 34-3
Chapter 34: Trunk Settings
Wave Global Administrator Guide
• Specify the Receive Input Threshold level
You enable this when you disable the Enable Receive Equalizer check box. When
automatic receive equalization is turned off, the framer chip recovers signals by comparing
directly to a Receive Input Threshold. If the signal is lower than the threshold, the chip
senses a 0. If the signal is higher than the threshold, the chip senses a 1. If the signal is
exactly the same as the threshold, the result is unpredictable.
1.36 volts is the default threshold level. T-1 signals generally range between 0 and 3 volts
in amplitude. However, if a signal is extremely weak, you can set the receive threshold to
as little as .22 volts.
Setting the Receive Input Threshold attempts to reduce the input threshold value to
accommodate a small input signal.
Note that there are two problems with disabling the automatic equalizer. First is that the
Wave system cannot adjust for dynamic changes in the signal strength of the T-1 line with
the fixed boost given by the T-1 framer chip. Second, you must try to guess what the
optimal input threshold level is. Generally, the automatic equalizer can determine the
optimal input signal level better than you can guess the input threshold level.
• Edit the Transmit Pulse Mask
This field allows you to input raw data to directly determine four points on the shape
template of the T-1 pulse that is transmitted. Any changes to this field can easily cause the
far-end to be unable to receive the T-1 signal sent by the Wave system. Do not modify this
field unless specifically advised to do so by a Vertical Communications Customer Service
representative.
Release 2.0
September 2010