Chapter 5 System Information and Diagnostics
© Polycom, Inc. 143 ViewStation FX/VS 4000 User’s Guide
IMUX (PRI T1)
• Numbers - Use the PRI Video Numbers screen to enter your
area code and your PRI Video numbers. If your system is on
PBX, enter the prefix number for an outside line.
• PRI Network - This screen allows you to access the PRI Setup
screen and the PRI information screen
– PRI Setup
– PRI Line Type—The PRI Line Type is auto-detected on
bootup by the ViewStation FX/VS4000.
– Line Termination—A Line terminator is required when the
ViewStation FX or VS4000 is powered down.
– 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 (Zero) is used by default and
cannot be edited.
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