Zhone Technologies, Inc. | IMACS Product Book, Version 4 |
Applications
The ISDN PRI Server card can be used in a variety of applications:
•Fractional ISDN PRI provisioning
•Video conferencing
•Integrated ISDN access with SINA
•Video Broadcast
•Router with redundant trunk routing via ISDN
•Router adding incremental bandwidth
•PRI to FXS
Fractional PRI Provisioning
An IMACS equipped with a 8840C PRI Server card is used to groom multiple fractional PRI circuits into one or more PRI circuits for backhaul to an ISDN switch. Perhaps a customer may not need the entire bandwidth delivered by a PRI circuit. The optimal alternative would be to purchase a fractional PRI service delivered over a regular T1 or E1 circuit. When a service provider has multiple fractional PRI customers, the service provider can deploy the IMACS to groom the multiple fractional PRI circuits into one fully utilized PRI T1/E1 circuit, which is back hauled to the switch. This concentration of PRI circuits reduced back haul costs for the service provider, and conserves T1/E1 ports and
Figure 23 shows that three customers are subscribing to ISDN services. Each customer is using a fractional PRI service. Each customer could be directly connected to the ISDN switch, which would consume three fractional T1/E1 circuits, and three D channels. Instead, the 3 fractional ISDN circuits are connected to a PRI Server equipped IMACS. The PRI server grooms the B channels in the three fractional ISDN circuits into one circuit. It also grooms the three D-channel circuits into a single D channel that is routed to the switch. The IMACS benefits in this application include saving on back haul costs, switch port costs and switch system resources.
Customer 1 10B+D
Customer 2 |
|
7B+D | IMACS |
ISDN
Switch
23B+D on T1
30B+D on E1
Customer 3 5B+D
Figure 23—Fractional PRI Provisioning Using IMACS
ISDN Video Conferencing and Video Broadcast
The IMACS is used to connect
March 2001 | Page 72 |
