SY0003-1.544-38.88-51.84-S [RALTRON]

Support Circuit, 1-Func,;


型号：	SY0003-1.544-38.88-51.84-S
厂家：	Raltron Electronics Corporation
描述：	Support Circuit, 1-Func,
文件：	总5页 (文件大小：85K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SYNCHRONOUS EQUIPMENT

SONET MINIMUM CLOCK - SY0003

Date: November 15, 2000

SY0003

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^thSt § 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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SONET MINIMUM CLOCK - SY0003

ALARMS

OUT 2

T.S.

MUX,

FPD,

Counters

Ref. 1

Ref. 2

OUT 1

VCXO

DSP

DAC

(RAM,

FLASH)

Cnt. 0

Cnt. 1

Logic

RS 232

MAN./AUTO

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.

ü 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^thSt § 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

Locked to Ref.2

In this mode the output of the module is phase locked to input reference 2.

The REF1 or REF2 Modes are typically used when a slave clock source is synchronized to the network. In these

modes, the SY0003 provides timing signals, which are synchronized, to one of two references inputs (REF1 or

REF2). The input reference signals may have a variety of nominal frequencies, which is typically specified by the

end user. When the modes are selected the unit goes through a reference evaluation, and then a frequency

acquisition, and finally to phase locking.

Input References

The SY0003 module accepts two input references EX REF1 and EX REF2. End users can specify the frequencies

within a range of 8 kHz to 77.76 MHz. The input reference signals are HCMOS/TTL levels with timing

characteristic in according to Bellcore GR-1244-core 3.2.1.R3-1 or equivalent standards. Please note that the end

user must specify the two input frequencies at the time of order.

Output Signals

The SY0003 module provides two output signals OUT and OPT OUT. The first outputs are generated by the

internal oscillator and scaled by the output frequency converters if necessary. The second output is coming from

free running crystal oscillator. The performance of the module significantly depends on the internal oscillator and

special care was taken to define its specification. A high quality Crystal Oscillator (VCXO) is used as the internal

oscillator. The frequency of the oscillator is specified according to the network application where the SY0003 will

be used. The frequency converters divide signal from the oscillator to the specified frequencies.

RALTRON ELECTRONICS CORP. § 10651 N.W.19^thSt § 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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SONET MINIMUM CLOCK - SY0003

PIN DESCRIPTION

+5V

EX REF1

GND

HOLDOVER

REF 1

REF2

EX REF 2

GND

FREERUN

GND

OPT OUT

GND

ALARM OUT

CNT 1

OUT

CNT 2

GND

PLL UNLOCK

Bottom View

Pin #

Name

Description

Holdover Signal -> the unit is in holdover mode

Reference 1 Signal -> the unit is enslaved to the reference 1

Reference 2 Signal -> the unit is enslaved to the reference 2

Freerun Signal -> the unit is in the free run mode

Alarm signal

Control Input 1 -> the external input for selecting mode of the unit

Control Input 2 -> the external input for selecting mode of the unit

PLL Unlocked Signal -> the unit is unlocked

Ground

HOLDOVER

REF 1

REF 2

FREERUN

ALARM OUT

CNT 1

CNT 2

PLL UNLOCK

GND

5,10,12,14,16

+5V

OUT

OPT OUT

EX REF1

EX REF 2

Positive Voltage Supply

Synchronized Output -> the primary output

Optional Second Output -> the secondary output, optional, user selectable

External Reference 1 Input -> the input from reference 1

External Reference 2 Input -> the input from reference 2

ORDERING INFORMATION

SY0003 - [Input Reference Frequencies] - [Output 1] - [Output 2] –[Output 2 type]

-> 8kHz

-> 1.544MHz

-> 2.048MHz

19.44

38.88

77.76

51.84

-> 19.44MHz

-> 38.88MHz

-> 77.76MHz

-> 51.84MHz

-> 8kHz

Free run

Synchronized

1.544

2.048

19.44

38.88

77.76

51.84

->19.44MHz

->38.88MHz

->77.76MHz

-> 51.84MHz

- For other frequencies contact the factory!

- Example: SY0003-8-19.44-19.44-F

RALTRON ELECTRONICS CORP. § 10651 N.W.19^thSt § 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

SPECIFICATION

General Specifications

Mechanical 2” (D) x 2” (W) x 0.55” (H)

Power 5VDC, 2W

Metal box, 18p dual-in-line

Environment Operating Temperature

Storage Temperature

Humidity

-20°C to 70°C

-40° to 85°C

5% to 95% non-condensing

FCC Part 15, Class B, CE Marked, UL

EMC

Internal Oscillators Voltage Controlled Crystal Oscillator

(VCXO) and Clock Oscillator

Input Signals

Number of Inputs

Input reference frequency 8kHz

Signal Level HCMOS/TTL Compatible

Time Reference characteristics Bellcore: GR-1244-core

Number of Outputs

Selectable from range 4kHz to 77.76MHz

Output Signals

Output 1 19.44MHz

Output 1 Signal Level HCMOS

Output 2 19.44MHz

Selectable from range 8kHz to 38.88MHz

Free-running clock

Output 2 Signal Level HCMOS

Signal Quality

Performance

Jitter generation <0.03UIp-p

Jitter tolerance Bellcore: GR-253-core rev. 1

Wander generation Bellcore: GR-253-core rev. 1

Wander tolerance Bellcore: GR-253-core rev. 1

Wander transfer Bellcore: GR-1244-core

Filtering (Wander transfer) <0.1Hz

Frequency Output

Performance

Free run accuracy

±20ppm

Holdover stability

±4.6ppm

Initial offset

Temperature

Pull-in/Hold-in range

<±0.05ppm

<±4.1ppm

±20ppm

Holdover history 1 min

OUTLINE DRAWING

.010

(.25)

2.00 SQ.

(50.08 SQ.)

.55

(13.97)

1.60

(40.64)

SY0003

RALTRON

YYWW

0.147

(3.73)

RALTRON ELECTRONICS CORP. § 10651 N.W.19^thSt § Florida 33172 § U.S.A.

Tel: 305 593-6033 § Fax: 305-594-3973 § e-mail: sales@raltron.com § Internet: http:/www.raltron.com

SY0003-1.544-38.88-51.84-S [RALTRON]

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