Polycom ViewStation FX User Manual page 43

Chapter 1
© Polycom, Inc.
• PRI Line Type—The PRI Line type is automatically detected in
the ViewStation FX and VS4000.
• Line Termination—Line termination is required when there is
power to the ViewStation FX or VS4000.
• Line Signaling—The Line Signaling field of the PRI Information
screen provides the following choices:
• CRC4/HDB3: This is the default value. Data is encoded
using HDB3 to ensure proper ones-density, and CRC4 error
checking is enabled on both transmit and receive.
• HDB3: CRC4 error checking is disabled.
• For E1, NET5/CTR4 is the default. NET5/CTR4 is the
standard ETSI protocol derived from ITU Q.931.
• For T1, NET5/CTR4 is also provided for certain Asian
countries, such as Japan, Hong Kong, and Taiwan.
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 are
prompted "Do you wish to continue?" If you do, the current
switch protocol is changed to the default for the selected
country. This causes a reset of the PRI interface.
If more than one switch protocol is supported, you must find out
from the 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.
• Terminal Endpoint ID (TEI)—0 is used by default and cannot
be edited.
• Number of Active Channels—This option is set automatically.
An E1 line has 30 active channels.
• D Channel location—This option is set automatically. The D
Channel location for an E1 line is 16.
• Network Mode—User customer premises equipment (CPE) is
the default setting on the ViewStation FX/VS4000.
• Clock Source—External is the default setting on the
ViewStation FX or VS4000.
29 ViewStation FX/VS 4000 User's Guide
Getting Started