Appendix D PRI Technical Notes
ViewStation FX/VS 4000 User’s Guide 184 www.polycom.com
P-LINK side of the PRI network interface module.
The other side of the PRI network interface module is called the
P-LINK side. This side has:
• A circular slot for a DC power supply
• Two keyed RJ-45 connectors
• Two vertical LEDs
Figure 4-1. PRI Network Interface Module
PRI Network Interface Modules
There are two kinds of PRI network interface modules:
• T1 - used in North America, Japan, Taiwan, and Hong Kong.
• E1 - used in Europe and most of the other countries that do not
use the T1.
The T1 interface network module supports twenty-three 64 kbps B
channels and one D channel (channel 24) for signaling. The E1
network interface module supports thirty 64 kbps B channels and
one D channel (channel 16). Therefore, the aggregate data capacity
is:
• T1 - 1472 kbps
• E1 - 1920 kbps
The T1 and E1 also have different methods of signaling and framing.
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