MT90883 Zarlink Semiconductor, MT90883 Datasheet - Page 26

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

5.0
5.1
The MT9088x family provides the data-plane processing to enable constant bit rate TDM services to be carried
over a packet network, such as an Ethernet or IP network. The device segments the TDM data into user-defined
packets, and passes it transparently over the packet network to be reconstructed at the far end. This has a
number of applications, including packet backplanes for TDM-based equipment, and emulation of TDM circuits
(similar to the circuit emulation services for ATM, see references 5 and 6).
The advantages of using a packet medium for transport and distribution of TDM services include:
Scalability
Efficiency
Service provisioning
Cost
Physical distribution
bus segment
H.100/H.110
Overview
Functional Operation
MT90866
Switch
H.110
Figure 8 - H.100/H.110 Expansion using Ethernet Switching Fabric
Processor
MT90880
TDM-IP
TDM-based systems are hard to scale in capacity for two main reasons:
TDM equipment dedicates capacity to all channels, whether in use or not. Use of a
packet-based system allows the available bandwidth to be statistically multiplexed,
taking advantage of the fact that not all channels are active all the time.
It is easier to add new services by adding new line input cards or resource cards.
These are not constrained to be in the same physical rack, as with a TDM
backplane system.
Network hardware is readily available at lower cost than equivalent TDM
equipment, reducing the overall cost of ownership.
Equipment may be physically distributed over a wider area, connected either by
simple twisted pair network cable, or by fibre. This allows the footprint for
co-located equipment (for example) to be small, with the main resources located
elsewhere on the network.
• TDM clock frequency increases in proportion to the number of input channels, and
• Physical limitations - the form factor of hard backplane systems effectively restrict
this high frequency clock must be distributed around the system while maintaining
accurate phase alignment
the TDM backplane to a single rack, limiting the size of the system that can be
connected
Ethernet
H.100/H.110
bus segment
Zarlink Semiconductor Inc.
MT90880/1/2/3
MT90866
Switch
H.110
26
MVTX2604
Processor
MT90880
Ethernet
TDM-IP
Switch
Ethernet
bus segment
H.100/H.110
Ethernet
MT90866
Switch
H.110
Processor
MT90880
TDM-IP
Data Sheet