ZL50110_08 ZARLINK [Zarlink Semiconductor Inc], ZL50110_08 Datasheet - Page 51

• Manufacturer Part Number: ZL50110_08
• Description: 128, 256, 512 and 1024 Channel CESoP Processors
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

The ZL50110/11/12/14 is capable of handling circuit emulation of both structured T1, E1, and J2 links (e.g., for
support of fractional circuits) and unstructured (or clear channel) T1, E1, J2, T3 and E3 links. The device handles
the data-plane requirements of the provider edge inter-working function (with the exception of the physical
interfaces and line interface units). Control plane functions are forwarded to the host processor controlling the
ZL50110/11/12/14 device.
The ZL50110/11/12/14 provides a per-stream clock recovery function, in unstructured mode, to reproduce the TDM
service frequency at the egress of the packet network. This is required otherwise the queue at the egress of the
packet network will either fill up or empty, depending on whether the regenerated clock is slower or faster than the
original.
4.2
The metro Ethernet application, shown in Figure 7, consists of the metro Ethernet service modules sitting on the
edge of the Metro Ethernet ring. The modules will connect Ethernet circuits and TDM circuits to the metro ring.
The ZL50110/11/12/14 is used to emulate leased line TDM circuits over Ethernet by establishing CESoP
connections over the Metro Ethernet ring between the MTUs/MDUs and the PSTN. The use of CESoP eliminates
the need for a separate TDM network in the metro core, thereby enabling convergence on a unified Ethernet
network.
Metropolitan Area Network Aggregation
Multi-Tenant
Customer
Premises
Units
f
service
~
Figure 7 - Metropolitan Area Network Aggregation using CESoP
Figure 6 - Leased Line Services Over a Circuit Emulation Link
TDM
T1/E1
Links
Provider Edge
CESoP
Interworking
Function
TDM to
packet
Access
Metro
ZL50110/11/12/14
Zarlink Semiconductor Inc.
(Resilient Packet Ring or
Access Network
Carrier Network
Metropolitan
Metro Ethernet)
Network
Packet
Metro
Core
51
OC-3, DS3
Access
Metro
Provider Edge
queue
Interworking
Function
CESoP
f
service
~
T1/E1
Links
TDM
Customer
Extract
Premises
Clock
Campus
f
service
Data Sheet