ZL50110_08 ZARLINK [Zarlink Semiconductor Inc], ZL50110_08 Datasheet - Page 58

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

5.3
The ZL50110/11/12/14 family offers the following types of TDM service across the packet network:
Unstructured services are fully asynchronous, and include full support for clock recovery on a per stream basis.
Both adaptive and differential clock recovery mechanisms can be used. Structured services are synchronous, with
all streams driven by a common clock and frame reference. These services can be offered in two ways:
•
•
In either mode, N x 64 Kbps trunking is supported as detailed in “Structured Payload Order” on page 62.
The ZL50110/11/12/14 supports structured mode or unstructured mode, however it does not support structured
mode and unstructured mode at the same time, all ports are either structured or unstructured. In structured mode,
all TDM inputs must be synchronous.
In addition, it can be used with a variety of different protocols. It includes full support for the IETF RFCs for
CESoPSN (Circuit Emulation Services over Packet Switched Networks) and SAToP (Structure-Agnostic Transport
over Packet) protocols.
5.3.1
The TDM Access Interface consists of up to 32 streams (depending on variant), each with an input and an output
data stream operating at either 1.544 Mbps or 2.048 Mbps. It contains two basic types of interface: unstructured
clock and data, for interfacing directly to a line interface unit; or structured, framed data, for interfacing to a framer
or TDM backplane.
Unstructured data is treated asynchronously, with every stream using its own clock. Clock recovery is provided on
each output stream, to reproduce the TDM service frequency at the egress of the packet network. Structured data is
treated synchronously, i.e., all data streams are timed by the same clock and frame references. These can either be
supplied from an external source (slave mode) or generated internally using the on-chip stratum 4/4E DPLL (master
mode).
Unstructured
asynchronous
Structured synchronous
(N x 64 Kbps)
Synchronous master mode - the ZL50110/11/12/14 provides a common clock and frame pulse to all
streams, which may be locked to an incoming clock or frame reference
Synchronous slave mode - the ZL50110/11/12/14 accepts a common external clock and frame pulse to be
used by all streams
TDM Interface
Service type
TDM Interface Block
Table 25 - TDM Services Offered by the ZL50110/11/12/14 Family
T1, E1, J2, E3 and T3
T1, E1 and J2
Framed TDM data streams at
2.048 and 8.192 Mbps
TDM interface
ZL50110/11/12/14
Zarlink Semiconductor Inc.
58
Bit clock in and out
Data in and out
Bit clock out
Frame pulse out
Data in and out
Bit clock in
Frame in
Data in and out
Interface type
Line interface unit
Framers
TDM backplane (master)
Framers
TDM backplane (slave)
Interfaces to
Data Sheet