Polycom VS4000 User Manual

Integrators’ Reference Manual for ViewStation EX, ViewStation FX, and VS4000

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www.polycom.com

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

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