82P33714_17 Datasheet, PDF (14/64 Pages) Integrated Device Technology – Synchronous Equipment Timing Source for Synchronous Ethernet

82P33714 Datasheet
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FUNCTIONAL DESCRIPTION
3.1 SYNCHRONOUS ETHERNET, SONET AND
SDH ARCHITECTURE
82P33714 integrates key features that allows the device to be used
in Synchronous Ethernet, SONET and SDH applications. There are sev-
eral key synchronization standards that are important to meet for such a
system, they are:
• ITU-T Recommendation G.8262, Timing characteristics of Syn-
chronous Ethernet Equipment slave clock (EEC)
• ITU-T Recommendation G.8264, Distribution of timing through
packet networks
• ITU-T Recommendation G.812, Timing requirements of slave
clocks suitable for use as node clocks in synchronization networks.
• ITU-T Recommendation G.813, Timing characteristics of SDH
equipment slave clocks (SEC).
• GR-253-CORE - Telcordia Technologies Generic Requirements -
Issue 5, October 2009
• GR-1244-CORE - Telcordia Technologies Generic Requirements -
Issue 4, October 2009
• ATIS-0900101.2006 - T1.101 - Synchronization Interface Standard
Figure 4 shows a single blade architecture that it is usually used in
simple equipment.
Single
Blade
BITS/SSU
SyncE (T0) ^APLL
T4
SyncE-TxCK
SyncE-RxCK
LOS
SyncE/
SONET
/SDH
PHY
CDR
Ethernet
TCXO
Figure 4. SyncE/SONET/SDH single blade application
Figure 5 shows an active/redundant architecture, as described
before it is usually used in Telecom equipment that are designed to have
a redundant timing card in case of primary timing card failure. The
redundant timing card mimics the output of the active timing card, so in
case of failure the system will still provide proper synchronization.
©2017 Integrated Device Technology, Inc.
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Revision 6, January 23, 2017