Cisco Systems 3527 PRI Manual De Usuario
1-9
Installation and Upgrade Guide for Cisco Unified Videoconferencing 3522 BRI Gateway and 3527 PRI Gateway Release 5.5
OL-14910-01
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.
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
in
), or to a local private branch exchange (PBX) that provides the PRI connection (as shown
in
).
Figure 1-4
Connecting the PRI Gateway Directly to a Central Office Switch
Figure 1-5
Connecting the PRI Gateway to a PBX that Provides a PRI Line
92873
H.323
Terminal
IP phone
IP
IP
network
Public
PRI T1/E1
Central office
switch
Private
Cisco IPVC
Gateway
Cisco IPVC
chassis/unit
157167
IP
H.323 terminal
IP phone
Cisco chassis/unit
Cisco Gateway
IP network
PRI T1/E1
Central Office
switch
PBX
Public
Private