Specifications

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Chapter 2 Cisco IGX 8400 Series Cards
Universal Router Module
Connections terminating on the URM can be virtual path connections (VPC) or virtual channel
connections (VCC).
The Cisco IOS router in the URM connects to Cisco IGX WAN through an internal ATM interface on
the URM card. Because the URM supports voice connections using either standard VoIP or
Cisco proprietary VoATM configurations (using ATM PVCs on the internal ATM interface), the remote
end of these connections is either an ATM PVC endpoint or a Frame Relay (FR) PVC endpoint.
Voice Connections on the URM
For voice applications, both the embedded UXM-E and the embedded router must be configured with
WAN connections that terminate at the internal ATM port. The embedded router must also be configured
with voice ports and dial-peers. The routing of a voice call from a voice port to the WAN connection
depends on the destination information for each voice call (each call’s routing information is described
in the dial-peer configuration commands).
When a call is placed, the URM receives the call through one of the T1 or E1 ports on the URI back card,
and decides where to route the call with the help of the embedded router dial-peers. ATM cells transfer
from the embedded router to the Cisco IGX, then to the configured ATM PVC destination. At the
destination, ATM cells travel from the Cisco IGX network into the embedded router of the destination
URM. With the help of dial-peers, this destination router routes the cells to the appropriate voice port,
which plays the voice into a T1/E1 channel.
Setting Up Communication in a Voice Network
When setting up a communication in a voice network using the URM, you will perform the following
tasks (see the “URM Configuration” section on page 2-93 for details):
1. Use the switch software CLI to set up connections between any IGX Frame Relay (FR) port or
external ATM port and the internal ATM interface within the URM.
2. Use the Cisco IOS CLI to configure the corresponding ATM PVCs on the internal ATM interface.
3. Use the Cisco IOS CLI to program dial-peers that connect the VoIP or VoATM voice ports of the
URM to the internal ATM interface.
Frame Relay Connections on the URM
Note Cisco IOS Release 12.1(5)YA does not support FRF.5/FRF.8 services for connections that originate or
terminate in the embedded router.
FR connections that originate in the URM card cannot be configured to go over the internal ATM
interface connecting the embedded router to the IGX WAN. Remote FR cards that support FRF.8 service
interworking, such as the IGX UFM, should use FRF.8 service interworking at the FR/ATM network
boundary to make end-to-end voice/data connections with the Cisco IGX URM.
The translational mode of the FRF.8 service interworking feature supports data and VoIP connections
between the URM and remote FR endpoints. The transparent mode of FRF.8 service interworking allows
the VoATM connections on URM to terminate in remote FR endpoints that have been configured for
Voice over Frame Relay (VoFR) operation.
End-to-end data and voice connections using VoIP are supported over both ATM trunks and FastPacket
trunks.