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SY01-SMC Dataheets PDF



Part Number SY01-SMC
Manufacturers Raltron Electronics Corporation
Logo Raltron Electronics Corporation
Description SYNCHRONOUS EQUIPMENT SONET MINIMUM CLOCK
Datasheet SY01-SMC DatasheetSY01-SMC Datasheet (PDF)

www.DataSheet4U.com SYNCHRONOUS EQUIPMENT SONET MINIMUM CLOCK - SY01-SMC SY01-SMC Date: April 20, 2002 • INTRODUCTION The SY01-SMC 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 SY01-SMC 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-.

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www.DataSheet4U.com SYNCHRONOUS EQUIPMENT SONET MINIMUM CLOCK - SY01-SMC SY01-SMC Date: April 20, 2002 • INTRODUCTION The SY01-SMC 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 SY01-SMC 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 8KHz 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 SY01-SMC performs clock regeneration as a Synchronous Equipment Clock (SEC), and is particularly designed for SONET equipment and network elements. However, SY01-SMC can be used in any other telecommunication equipment where synchronization is necessary if the performance allowed. RALTRON ELECTRONICS CORP. § 10651 N.W.19th St § Florida 33172 § U.S.A. Tel: 305 593-6033 § Fax: 305-594-3973 § e-mail: [email protected] § Internet: http:/www.raltron.com DataSheet 4 U .com www.DataSheet4U.com SYNCHRONOUS EQUIPMENT SONET MINIMUM CLOCK - SY01-SMC ALARMS OUT 2 XO T.S. Ref. 1 Ref. 2 Cnt. 0 Cnt. 1 MUX, FPD, Counter s& Logic DSP (RAM, FLASH) OUT 1 DAC VCXO MAN./AUTO RS 232 JTAG Figure 1. - The functional block diagram of SY01-SMC • DESCRIPTION The SY01-SMC 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 SY01-SMC 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 SY01-SMC 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 SY01-SMC 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.19th St § Florida 33172 § U.S.A. Tel: 305 593-6033 § Fax: 305-594-3973 § e-mail: [email protected] § Internet: http:/www.raltron.com DataSheet 4 U .com www.DataSheet4U.com SYNCHRONOUS EQUIPMENT SONET MINIMUM CLOCK - SY01-SMC 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 SY01-SMC provides timing signals, which are synchronized, to one of two references inputs (REF1 or REF2). The i.


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