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SY10 Datasheet Preview

SY10 Datasheet

SYNCHRONOUS EQUIPMENT STRATUM 3/3E CLOCK UNIT

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SY10
FEATURES
SYNCHRONOUS EQUIPMENT
STRATUM 3/3E CLOCK UNIT – SY10
Date: August 30, 2002
INTRODUCTION
The SY10 - an accurate time and frequency source
that had been designed as a subsystem level
module. The module is designed to work within ATM,
SONET, SDH, and wireless systems where
synchronization is vital. The SY10 is an excellent
synchronization solution for timing, with jitter and
wander compliance per the specified within ITU-T
Recommendations G.812/G.813 and Bellcore GR-
1244-CORE. The SY10 is an enhanced version of
SY01 and is designed for Stratum 3 and Stratum 3E,
but also holds certain features that can make it
useful for SONET Minimum Clock (SMC) or other
kinds of system clocks.
v A synchronization solution for timing, jitter and wander concerns in a single module.
v Complies with ITU-T Recommendations G.812/813 and Bellcore GR-1244-CORE for Stratum 3 and Stratum
3E applications.
v Supports modes of operation: Locked, Holdover and Free-run.
v Accepts reference inputs from up to six independent sources from 8KHz to 77.76MHz
v Provides up to 3 output from 8KHz to 77.76MHz (Two user select and one fixed at 8KHz)
v Loop filtering utilizing specific software application in the digital signal processor (DSP).
v Continuously monitors and evaluate input reference signals.
v Phase build-out for output clock.
v Creates a history buffer for Holdover mode operation.
v Alarm and status signals and messages.
v Host interface SPI for configuring and remote monitoring.
v Supports Master/Slave configuration of two SY10 with minimum phase error between two clocks.
v Provides “hit-less” switching during switching between the clocks.
v Pin compatible with 18 pins SY01 module.
v Small dimensions of 1.82 x 1.82 x 0.7 inch. (0.60 inch with no mechanical cover)
APPLICATION
The SY10, a Synchronous Equipment Clock (SEC), fulfills clock regeneration function for STRATUM 3 and 3E
equipment for: ATM, SDH, PDH, and SONET networks. It was designed for network system manufacturers such
as: Access Switches, Core Switches, Cross Connects, Digital Multiplexers-Exchangers, and SDH/SONET
equipment. The unit is also suitable for PCS, WLL, and Wireless Base Stations. Wherever a Timing unit with high
performance specifications is required, the SY10 can be embedded within the network system and provide all
necessary frequencies and interfaces.
RALTRON ELECTRONICS CORP. § 10651 N.W.19th St § Florida 33172 § U.S.A.
Tel: 305 593-6033 § Fax: 305-594-3973 § e-mail: sales@raltron.com § Internet: http://www.raltron.com
1




Raltron Electronics

SY10 Datasheet Preview

SY10 Datasheet

SYNCHRONOUS EQUIPMENT STRATUM 3/3E CLOCK UNIT

No Preview Available !

SYNCHRONOUS EQUIPMENT
STRATUM 3/3E CLOCK UNIT – SY10
Alarms and Statuses
Ex.Ref.1
Ex.Ref.2
Ex.Ref.3
Ex.Ref.4
Ex.Ref.5
Ex.Ref.6
MUX,
FPD,
Counters
&
Logic
DSP
(RAM,
FLASH)
OCXO
DDS
Output
PLL
Synthesizer
OUT 3
OUT 2
OUT 1
Control Inputs
SPI JTAG
Figure 1. - The functional block diagram of SY10.
DESCRIPTION
The SY10 synchronization module is a Digital PLL (DPLL), which utilizes application specific software in the digital
signal processor (DSP). The DSP is complemented by fast hardware logic (FPGA) where all multiplexers,
counters, dividers, phase detectors, output frequency converters and other control logic circuits are completely
implemented. The functional block diagram with maximum configuration is shown in figure 1. The module has
three phase lock loop – primary PLL, secondary and utility PLL. The primary PLL utilizes a Direct Digital Synthesis
(DDS) technique combined with a high stability OCXO in order to provide an accurate and fast DPLL response and
eliminates the requirement for an OCXO with high pullability. The primary loop is a low bandwidth loop that filters a
major part of the wander and the jitter at the input. The output of the primary PLL is connected to the secondary
PLL synthesizer that is also a DPLL but with a wider loop bandwidth. The secondary PLL loop has also another
input that comes from the SEC IN pin. Depending on the master–slave mode, the secondary loop utilizes either
one of the inputs. The output of secondary PLL is connected to the utility PLL that is an analog phase lock loop.
- The outputs of secondary and utility PLL provide three independent output signals.
- The SPI serial communication interface provides a flow of messages between the module and a host
processor.
- The JTAG interface provides an easy access for future software upgrade re-programming without
removing the module from the system.
The SY10 software provides several features such as:
- switching between the references inputs on the basis of monitoring and estimation of the input signals
and internal state diagram;
- real time calculation of the filtering algorithm for jitter and wander in according to the approved
standards;
- alarm, status and messaging functions using output pins and serial communication port.
For other configurations, please contact Raltron.
ü The module operates in the following three timing modes:
Free-run
In this mode, the unit is unlocked to either of the inputs. The accuracy of the output frequencies in this mode is
±4.6ppm. Free-run mode is typically used when a master clock source is required, not valid history of data for the
Holdover mode, or immediately following system power-up before network synchronization is achieved. In the
Free-run Mode, the SY10 provides timing and synchronization signals that are based on the accuracy of on-board
oscillators only, and are not synchronized to the reference signals.
RALTRON ELECTRONICS CORP. § 10651 N.W.19th St § Florida 33172 § U.S.A.
Tel: 305 593-6033 § Fax: 305-594-3973 § e-mail: sales@raltron.com § Internet: http://www.raltron.com
2


Part Number SY10
Description SYNCHRONOUS EQUIPMENT STRATUM 3/3E CLOCK UNIT
Maker Raltron Electronics
Total Page 21 Pages
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