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1. Voice-over-Broadband Networking 1000-A2-GN22-00
1-4 February 2003
Packet
Network
Configuration
The CPX-1000 transports voice traffic via an ATM network. When
Frame Relay is used, the frames are encapsulated in ATM cells.
In the packet network (Figure 1–3), voice-over-broadband requires
a minimum of two Permanent Virtual Circuits (PVCs) across the
network for each IAD (in both ATM and Frame Relay networks).
The first PVC transports the voice and management traffic
associated with all of the subscriber's telephone lines. The
voice PVC is configured as a variable bit rate-real time
(VBR-rt) PVC, and has priority over the data PVC.
The second PVC transports the data traffic. The data PVC is
typically set up as an unspecified bit rate (UBR) PVC.
Figure 1–3. VoBB Network Configuration
0250
Internet
PSTN
Frame
Relay
Access
MUX
Voice PVC
Data PVC
Packet
Switch
CPX-
1000
Class 5
Voice
Switch
FRF8
IWF
ILEC CO
ATM
Access
MUX
ILEC CO
ICP RSC
Subscribers
LAN
Phone Sys
IAD
LAN
Phone Sys
IAD
LAN
Phone Sys
IAD
LAN
Phone Sys
IAD
Data
DLCI
Voice
DLCI
Local
Loop