Polycom ViewStation FX4000 User Manual page 90

ViewStation FX/VS4000 User Guide
90
If you change the country settings, a new set of PRI switch
protocols is loaded. If the current switch protocol is no longer
available, you will be prompted with "Do you wish to
continue?" If you do, the current switch protocol will be
changed to the default for the selected country. This will cause a
reset of the PRI interface.
If more than one switch protocol is supported, you must find
out from your telephone service provider which protocol to
select.
The PRI network interface module originates and accepts data
calls only and does not work with incoming PRI choice calls or
non-PRI lines of any kind. Special services such as caller ID,
blocking, and call forwarding are not supported.
Line Signaling—Extended Super Frame (ESF)/Binary 8 Zero
Substitution (B8ZS) are the default framing format and default
line encoding format respectively. Legacy frame formats such as
D4 are not supported.
CSU—By default, the T1 PRI network interface module is set for
internal CSU mode.
To use an external CSU, specify the following information:
1. In the CSU field, select External.
2. In the Line Buildout field, select the proper cable distance
range that corresponds with the cable distance between the
PRI interface and the external CSU.
North America T1 only: Connect an RJ-45 cable from the
CPE equipment side of the external CSU to the PRI network
interface module.
For more information about the CSU, refer to the PRI Technical
Information section of the Polycom Office Integrators' Reference
Manual.
Line Build Out—If you are using an internal CSU, enter the
output attenuation in dB. If you are using an external CSU, enter
the output attenuation in feet.
Note
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