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ToPSync?
ACS9550T
ADVANCED COMMS & SENSING
Principles of operation
The ACS9550T provides standards-based timing for
equipment used in packet switched networks. Control of the
device is exercised by an API. The ACS9550T also has a Self-
Test capability that checks for defective operation prior to use.
The ACS9550T provides timing solutions that deliver a
performance better than that required by the G.8261 4
standard. The device can align its timebase with that of the
PTP Grandmaster and can generate time-of-day signals as well
as clock signals. The device filters packet delay variations and
maintains phase/time alignment with the Grandmaster,
without the need for PTP assistance in intermediary network
nodes (such as boundary clocks or transparent clocks).
Possible applications include:
? Providing six programmable rate clock (up to 62.5 MHz),
allowing wireless operators to migrate to packet-based
backhaul technology and eliminate T1/E1 interfaces, while
maintaining the required timing to all network elements.
? Providing a 1 PPnS signal, with or without associated ToD
information, which is aligned with the timebase of a central
Grandmaster clock, thereby supporting applications which
require a common phase to be available around a network
(such as wireless applications using TDD technologies).
The ACS9550T operates as a slave in accordance with the PTP
best master clock algorithm (BMCA), or via configuration that
allows the device to operate with another clock selection
mechanism.
The ACS9550T has holdover and free-run features for
conditions when no timing packet streams are available. The
stability of the output clocks during such self-timing activities
is dependent on the performance of an external oscillator that
controls the internal clocks. The oscillator should be chosen to
suit the frequency accuracy and phase stability requirements
of the application.
The ACS9550T performs all the functions required for a
complete, stand-alone, clock recovery system - including
hardware time-stamping, PTP protocol, network noise
suppression, network re-route accommodation and holdover,
and provides outputs for applications that require continuation
of frequency, phase and time. A serial peripheral interface is
provided for communication with a host microprocessor.
An API is provided for configuration and status monitoring. The
API offers system developers the means to produce
appropriate application software to configure and control the
ACS9550T and thus integrate the required functionality from
the device into their synchronization scheme.
The ACS9550T requires:
1 MB of SRAM
a generic packet PHY with appropriate termination circuitry.
FINAL PRODUCT BRIEF
References to standards
[1] IEEE Std. 1588? V2 -2008 (2008).
[2] ITU-T G.823 (03/2000).
[3] ITU-T G.824 (03/2000).
[4] ITU-T G.8261 (former G.pactiming).
[5] RoHS Directive 2002/95/EC.
[6] Waste electrical and electronic equipment (WEEE) 2003.
Associated documents
Refer also to the ACS9550T Datasheet, User Guide and
Application Programming Interface document.
Disclaimers & acknowledgements
This product is not designed or intended for use in life support
equipment, devices or systems, or other critical applications,
and is not authorized or warranted for such use.
Semtech Corporation reserves the right to make changes to
this product without notice. Customers are advised to obtain
the latest version of the documentation before placing orders.
Operation of this device is subject to the User’s
implementation and design practices. It is the responsibility of
the User to ensure that equipment employing this device is
compliant to all relevant standards.
ToPSync? is a registered trademark of the Semtech
Corporation. All other manufacturers’ trademarks are hereby
acknowledged.
ACS9550TPB_US, Revision 04, February 2010
?2010 Semtech Corp.
Page 2
www.semtech.com
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