Installation guide

Line Build Out settings 34-2
Chapter 34: Trunk Settings
Wave Global Administrator Guide
Wave also provides a -22.5 dB LBO value (12.5 percent power). This is not sanctioned by the
FCC and should never be used with the PSTN. However, for private networks where the far end
is only a few feet away, this might be useful.
The default, 0 dB, is the most common signal level for connection to the carrier. If line build out
is set incorrectly, the carrier may detect errors, prompting an SNMP yellow alarm and a yellow
LED on the T-1 module. If you see such indicators and cannot determine another cause, try
changing the Line Build Out setting.
Note: The yellow alarm will occur only in case of extreme errors, such as one in 100 bits being
bad.
Customizing transmit and receive signal settings
In the event that the standard Line Build Out settings are not correct for your T-1 configuration,
you can customize the following Line Build Out settings. For configuration instructions, see
“Configuring digital trunk card or module settings” on page 5-22.
Caution: Do not modify line build out settings unless you work with your T-1 provider
to determine appropriate settings.
Note:
If you find a “canned” cable length that works well, these settings will be grayed out and
ignored. If you specify that you are using a Custom Cable, these settings will be used.
• Enable Receive Equalizer
This setting determines whether automatic receive equalization is enabled or not. If this is
enabled, the Wave T-1 framer chip automatically and intelligently boosts the signal
coming in to the optimal level for pulse detection. This is called automatic equalization.
In this mode, the Wave system can accommodate an incoming signal strength range
between -36 and -0 dB.
If the Enable Receive Equalizer check box is disabled, a fixed (non-intelligent) 6 dB boost
is added to the receive signal. If this box is disabled, the Receive Input Threshold list box
is then enabled.
Release 2.0
September 2010