Can you tell me the advantages and disadvantages of V5.2 interface and E1, PRI ISDN?

Can you tell me the advantages and disadvantages of V5.2 interface and E1, PRI ISDN?

Regarding VoDSL, we need a voice gate way to communicate with PSTN. We can use V5.2 interface or E1, PRI ISDN. Can you tell me the advantages and disadvantages of each?

    Requires Free Membership to View

    Login

    SearchUnifiedCommunications.com members gain immediate and unlimited access breaking industry news, expert advice on UC, technical guides, and more -- all at no cost. Join me on SearchUnifiedCommunications.com today!

    Kate Gerwig, Editorial Director

    By submitting your registration information to SearchUnifiedCommunications.com you agree to receive email communications from TechTarget and TechTarget partners. We encourage you to read our Privacy Policy which contains important disclosures about how we collect and use your registration and other information. If you reside outside of the United States, by submitting this registration information you consent to having your personal data transferred to and processed in the United States. Your use of SearchUnifiedCommunications.com is governed by our Terms of Use. You may contact us at webmaster@TechTarget.com.

There are multiple providers of VoDSL voice gateways that allow for communication with the PSTN. Here are some providers of gateways that support V5.2 or E1 PRI.

When possible, it is better to use V5.2. A single V5.2 interface group can expand from one to 16 E1 circuits (up to 494 simultaneous calls) and provides redundancy on the two E1 circuits carrying the data links. V5.2 also supports concentration so that more subscribers can be provisioned than there are available timeslots between the gateway and the central office switch. V5.2 supports up to 32,768 subscribers per interface group, but in practice, about a 4:1 subscriber to available timeslots ratio is used. With standard E1 PRI (not using NFAS), there is no redundancy in the data links. Each E1 has its own data link which uses up timeslot 16 (which is available for calls on all E1 interfaces in a V5.2 interface group except on primary and secondary E1 carrying the data links). Additionally, E1 PRI does not support concentration. The only reason to use E1 PRI would be if V5.2 service could not be provided by the local switch.

This was first published in April 2004