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Installation and Upgrade Guide for CiscoUnified Videoconferencing 3522BRI Gateway and 3527 PRI Gateway Release5.5
OL-14910-01
Chapter1 Functionality
About Cisco U nified Videoconferencing3500 Gateway Functionality
Resource Allocation across E1/T1 Lines
The gateway can allocate bandwidth resources to calls across separate E1 or T1 co nnections 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 ca lls on ea ch T 1 li ne, w ith 32 0 Kb ps
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 + 32 0 K bps s par e
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 CiscoUnified Communications Manager without the need for a
gatekeeper.