MT90883 Zarlink Semiconductor, MT90883 Datasheet - Page 22

• Manufacturer Part Number: MT90883
• Description: (MT90880 - MT90883) TDM to Packet Processors
• Manufacturer: Zarlink Semiconductor

4.3
Internet off-load is a means of relieving the congestion in circuit-switching equipment caused by excessive dial-up
modem traffic with long call duration. Modem traffic is directed to the packet-switched network, bypassing traditional
voice switches. This reduces the capacity of the required circuit switches, and hence the cost of a typical
installation.
The MT90880 is an ideal device for implementing internet off-load, allowing voice traffic to be routed through the
TDM switch to the voice switching infrastructure, and modem traffic to be sent over the packet network to the
Remote Access Concentrator (Figure 4). The RAC could be local or remote, with traffic routed over the data
networks.
Internet Off-load
T1/E1/
ISDN
subscribers
Dial-up
Line Input Card
Framer/LIU
MT9076
Interworking Function
Circuit Emulation
Figure 3 - Circuit Emulation Services over the packet network
PSTN
Figure 4 - Internet Off-load solution using the MT90880
Processor
MT90880
TDM-IP
Voice Traffic
Modem Traffic
T1/E1/
ISDN
Zarlink Semiconductor Inc.
MT90880/1/2/3
Line Input Card
transparent data flow
MT9076
Framer
Ethernet
22
TDM
Ethernet
MVTX2604
Processor
MT90880
Ethernet
TDM-IP
Switch
Line Input Card
Processor
MT90880
TDM-IP
Interworking Function
Circuit Emulation
TDM
Framer/LIU
MT9076
Voice Switch
Packet
Class 5
Data Sheet
T1/E1/
ISDN