SY000131B RALTRON 8-19 440-8-H SYNCHRONOUS TIMING EQUIPMENT CLOCK MODULE

Description

SY-0001B8-19.440-8-1                                      RALTRON ELECTRONICS, LTD.
The
SY-0001B
is an accurate time and frequency source that has been designed as a module level subsystem for easy incorporation into ATM, SONET, SDH, wireless systems or any other systems where synchronization is tantamount. The SY-0001B is an advanced synchronization solution for the timing needs of digital telecommunications, jitter and wander issues in accordance with ITU-T Recommendations G.813 and BellCore GR-1244-CORE, and the maintenance of end to end network performance
How the SY-0001B can be utilized in an application?
Basically, SY-0001B is used on a customer’s clock board as a module or sub-system. The SY-0001B module accepts four types of input signal, for example, T1, E1, SONET, and GPS that are usually resident within the network system. These input signal interface and connect the physical layer of the network to the SY-0001B module. The network interface consists of line interfaces, receivers, and transmitters usually implemented in an integrated circuit. The simplified operation. The simplified operation is as follows: The receiver in the interface takes data patterns from network and extracts the clock signal that will be used as the input reference for SY-0001B. The SY-0001B generates a new clock signal that supplies the transmitter IC of the interface. The new clock signal is now used as the master clock signal for this particular network element.
The SY-0001B Synchronization Module is a Digital PLL (DPLL) which utilizes application specific software in the digital signal processor (DSP).
The SY-0001B provides several key features:
Monitors the input references using an allocated memory buffer that estimates the signal existence and its quality.
Real time calculation of the filtering algorithm for jitter and wander in accordance with approved standards (ITU-T and Bellcore).
Alarm, status and messaging functions.
Controlling the internal references for frequency versus temperature, aging, and calibration effects.
From the simplified block diagram shown the unit operates in four working modes:
Slaved to Input Reference 2 Typically, the unit has to change timing modes in response to external events.
Two types of mechanism are offered to select between timing modes:
Autonomous mode performing in accordance with the program.
Manual selection is performed via controls consistent with the user system (Cnt. 0 and Cnt. 1).
Both mechanisms can be selected by setting the jumper (MAN/AUTO) on the module.