SY0003-2.048-38.88-38.88-S datasheet, PDF

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SY0003-2.048-38.88-38.88-S: DescriptionSupport Circuit, 1-Func,; CategoryWireless rf/communication Telecom circuit; File Size85KB，5 Pages; ManufacturerRaltron; Websitehttp://www.raltron.com/

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SY0003-2.048-38.88-38.88-S Overview

Support Circuit, 1-Func,

SY0003-2.048-38.88-38.88-S Parametric

Parameter Name	Attribute value
package instruction	,
Reach Compliance Code	compliant
app	SONET;SDH
JESD-30 code	R-XDMA-P18
Number of functions	1
Number of terminals	18
Maximum operating temperature	70 °C
Minimum operating temperature	-20 °C
Package body material	UNSPECIFIED
Package shape	RECTANGULAR
Package form	MICROELECTRONIC ASSEMBLY
Certification status	Not Qualified
Nominal supply voltage	5 V
surface mount	NO
Telecom integrated circuit types	ATM/SONET/SDH SUPPORT CIRCUIT
Temperature level	COMMERCIAL
Terminal form	PIN/PEG
Terminal location	DUAL
Base Number Matches	1

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SYNCHRONOUS EQUIPMENT

SONET MINIMUM CLOCK - SY0003

SY0003

Date: November 15, 2000

•

INTRODUCTION

The SY0003 is an accurate time and frequency source that has been designed as a module level subsystem for

easy incorporation into SONET/SDH systems or network elements. The SY0003 is an advanced synchronization

solution for timing, jitter and wander issues in accordance with specification for SONET Minimum Clock (SMC)

given by BellCore GR-253-CORE and BellCore GR-1244-CORE.

•

FEATURES

A synchronization solution for timing, jitter and wander concerns in a single module.

Complies with Bellcore GR-1244-CORE and GR-253-CORE for SMC applications.

Supports four modes of operation: Locked to Reference 1, Locked to Reference 2, Holdover and Free-run.

Accepts reference inputs from two independent sources from 8 kHz to 77.76 MHz.

Provides two outputs up to 77.76 MHz.

Loop filtering utilizing application specific software in the digital signal processor (DSP).

Continuously monitors and evaluate input reference signals.

Creates a history buffer for Holdover mode operation.

Manual or Automatic selection between timing modes.

Alarm and status signal.

Host interface and JTAG port.

Small dimensions of 2.0 x 2.0 x 0.55 inch.

•

APPLICATIONS

The SY0003 performs clock regeneration as a Synchronous Equipment Clock (SEC), and is particularly designed

for SONET equipment and network elements. However, SY0003 can be used in any other telecommunication

equipment where synchronization is necessary if the performance allowed.

RALTRON ELECTRONICS CORP.

10651 N.W.19 St

Florida 33172

U.S.A.

Tel: 305 593-6033

Fax: 305-594-3973

e-mail: sales@raltron.com

Internet: http:/www.raltron.com

SYNCHRONOUS EQUIPMENT

SONET MINIMUM CLOCK - SY0003

ALARMS

OUT 2

T.S

Ref. 1

Ref. 2

Cnt. 0

Cnt. 1

MUX,

FPD,

Counters

Logic

DSP

DAC

(RAM,

FLASH)

VCXO

OUT 1

MAN./AUTO

RS 232

JTAG

Figure 1. - The functional block diagram of SY0003

•

DESCRIPTION

The SY0003 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 (CPLD) 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. Depending on the

application, the user can specify an appropriate configuration to fit their system requirements. The basic

configuration utilizes one DPLL with a VCXO as on-board oscillator, shown in figure 1. The VCXO is driven by a

digital-to-analog converter (DAC1) and provides the accurate and stable signal with less power consumption. The

output frequency converters scale the output frequency from the oscillator. For other configurations, please contact

Raltron. The second output is provided by free running crystal oscillator.

The module operates in the following four 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

±20ppm. 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 SY0003 provides timing and synchronization signals that are based on the accuracy of on-

board oscillators only, and are not synchronized to the reference signals.

Holdover

In this mode the module has lost its reference inputs and is utilizing stored timing data, called history, to control the

output frequency. Holdover Mode is typically used while network synchronization is temporarily disrupted. In

Holdover Mode, the SY0003 provides timing, based on data from the history buffer, while unlocked to an external

reference signal. The history data is determined while the device is locked to an external reference signal. The

stability of the output signal in holdover mode depends primarily on the stability of on-board oscillator and

environment effects where the clock is mounted. The SY0003 uses an VCXO as an on-board oscillator but other

types of oscillators are available.

Locked to Ref.1

In this mode the output of the module is phase locked to input reference 1.

RALTRON ELECTRONICS CORP.

10651 N.W.19 St

Florida 33172

U.S.A.

Tel: 305 593-6033

Fax: 305-594-3973

e-mail: sales@raltron.com

Internet: http:/www.raltron.com

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