Chapter 1 Functionality
About Cisco Unified Videoconferencing 3500 Gateway Applications and Topologies
The Cisco PRI gateway features configurable E1/T1 PRI ISDN connections. When configured as an E1 connection, each port provides 30 B channels and one D signaling channel. When configured as a T1 connection, each port provides 23 B channels and one D signaling channel. The type of line available depends on your local ISDN provider. You configure the gateway PRI port to an E1 or T1 interface accordingly. In addition, you can choose to activate only specific channels by using fractional channel selection.
PRI Gateways
You can connect the PRI gateway directly to a PRI line provided by your local ISDN provider (as shown in Figure
Figure 1-4 Connecting the PRI Gateway Directly to a Central Office Switch
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Figure 1-5 Connecting the PRI Gateway to a PBX that Provides a PRI Line
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Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.5
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