Polycom ViewStation EX4000 - Manual (Page 98)

Integrators’ Reference Manual for ViewStation EX, ViewStation FX, and VS4000
88 www.polycom.com
Network Configuration
The following paragraphs give information about configuring the
ViewStation EX, ViewStation FX, and VS4000 systems for the ISDN
network.
On a PRI T1 Network: Configuring the CSU
If you use an external CSU, you must specify the following
information on the PRI Setup screen (System Info > Admin Setup
> Video Network > IMUX > PRI Network > PRI Setup
):
1. In the CSU field, select External.
2. In the Line Buildout field, select the length of the cable that
connects the PRI network interface module to the CSU.
You can also configure the T1 PRI network interface module to act
as a CSU. To do this, the external power supply must be connected.
To use the T1 PRI network interface module as an internal CSU, you
must specify the following information on the PRI Setup screen
(System Info > Admin Setup > Video Network > IMUX > PRI
Network > PRI Setup
):
1. In the CSU field, select Internal.
2. In the Line Buildout field, select an appropriate dB setting. The
telephone company usually determines the dB value by
measuring the characteristics of the line. If an external CSU was
previously used, use the setting selected for that CSU.
Otherwise, start with 0.