Chapter 1 Functionality
About Cisco Unified Videoconferencing 3500 Gateway Functionality
Resource Allocation across E1/T1 Lines
The gateway can allocate bandwidth resources to calls across separate E1 or T1 connections to maximize bandwidth capacity in cases where there is not enough capacity for a call on a single E1 or T1 connection, but where sufficient capacity does exist when remaining capacity on both E1/T1 lines is combined.
For example, a gateway using two T1 lines can support three 6B calls on each T1 line, with 320 Kbps spare capacity per line:
•Each T1 line provides 23 B channels.
•Each B channel supports 64 Kbps
•Each T1 line supports 23 x 64 = 1472 Kbps
•Each 6B call requires 6 x 64 = 384 Kbps
•Each T1 line supports 1472/384 = 3 6B calls + 320 Kbps spare
The gateway processes an additional 6B call requiring a further 384 Kbps by taking bandwidth resources from each of the two T1 lines, both of which have 320 Kbps available. In this way, the gateway spreads the call over both T1 lines.
About Peer-to-Peer Connectivity
The gateway supports the following types of connectivity to the IP network
•Through a gatekeeper
•Directly to a peer device such as Cisco Unified Communications Manager without the need for a gatekeeper.
| Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.5 |