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Integrators’ Reference Manual for ViewStation EX, ViewStation FX, and VS4000
26 www.polycom.com
PRI Network Interface Module for ViewStation FX and
VS4000
The following paragraphs provide technical information about the
T1 and E1 PRI network interface modules available with the
ViewStation FX and VS4000. This network interface module is not
available with the ViewStation EX.
Table 2-16. PRI T1 and E1 Network Interface Modules
Parameter PRI T1 PRI E1
Areas where used North America,
Japan, Hong Kong,
Taiwan
Europe, other areas
where T1 is not used
B channels 23 30
D channels 1 1
Total data capacity 1472 Mbps
(23 x 64 Kbps)
1920 Mbps
(30 x 64 Kbps)
Power source VS4000/ViewStation
FX, via peripheral
cable
External power supply
available (required if
not using external
CSU)
VS4000/ViewStation
FX, via peripheral
cable
External power supply
available
Clock source Network Network
Keep-alive signal Yes No
Switch protocol AT&T 5ESS
AT&T 4ESS
Nortel DMS
NI-2
NET5/CTR4
Line signalling ESF/B8ZS CRC4/HDB3
HDB3
H0 and other
higher-bandwidth
channels
Not supported