3Com 3C10200 NBX Installation Guide - Page 154
Adding an E1 Digital Line Card, Preparing the NBX System for E1 Cards, Ordering DID, CLIP
View all 3Com 3C10200 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 154 highlights
154 CHAPTER 7: E1 ISDN PRI DIGITAL LINE CARD Adding an E1 Digital Line Card The following sections tell you how to add an E1 Digital Line Card to an NBX system: ■ Preparing the NBX System for E1 Cards ■ Ordering DID, CLIP, and MSN Services for E1 ■ Inserting the E1 Digital Line Card Preparing the NBX Before you insert the E1 Digital Line Card into the chassis, order an E1 System for E1 Cards line, with the specifications you want, from your telephone carrier, and have them install the line. Ordering DID, CLIP, and MSN Services for E1 When you order E1 with DID, CLIP, or MSN services, the local telephone carrier assigns a block of telephone numbers to you. Usually, you can request a specific range of numbers, but sometimes the carrier assigns numbers other than the ones you request. You may be able to request that the local telephone carrier pass you a specific number of digits for each incoming telephone call. Sometimes the carrier does not offer any choice. In either situation, you need to know how many digits the carrier passes. Example: Carriers commonly pass either the last three digits or last four digits of the number for each incoming call. Sometimes the last digits of the telephone numbers the carrier assigns to you do not match the telephone extension numbers you want to use for internal calls. You can create entries in your Dial Plan configuration file to translate the incoming numbers into the corresponding extension numbers. Example: You want to use internal extensions 4000 through 4999, but the local telephone carrier assigns you numbers from 617-555-3500 through 617-555-4499. You can create translator entries in the Dial Plan configuration file to translate an incoming digit sequence such as 3795 into extension number 4295, and a sequence such as 4213 into 4713. The configuration would require several translator entries to handle subsets of the total range. A unique set of entries would handle incoming digit sequences from 3500 through 3599, from 3600 through 3699, and each of the other sequences in which the first two digits were unique in the range from 37XX through 44XX. If the DDI/DID numbers match your internal extension numbers, the translator entries in your Dial Plan can be much simpler. Example: You plan to use internal extensions from 100 through 299, and the local telephone company assigns you numbers from