SM3-19.44M

Application Specific Clock/Timing Overview

The SM3-19.44M is a Stratum 3 timing module manufactured by Connor-Winfield, designed to serve as a complete system clock solution for telecommunications networks. It complies with Bellcore GR-1221-CORE (Stratum 3) and ITU-T G.812 standards. The module provides redundant reference inputs and offers two synchronous output frequencies selectable from 8 kHz to 77.76 MHz. It features a 40-second filtered holdover history capability to maintain timing accuracy during reference loss. This component integrates oscillator and control circuitry into a single form factor suitable for network synchronization applications.

Application Specific Clock/Timing Feature Summary

• Compliant with Stratum 3 (GR-1221-CORE) and ITU-T G.812 timing standards
• Supports redundant reference inputs for enhanced reliability
• Provides two synchronous outputs ranging from 8 kHz to 77.76 MHz
• Includes 40-second filtered holdover history for stability

Application Specific Clock/Timing Applications

• Telecommunications network synchronization
• SDH/SONET system timing
• Digital cross-connect systems (DXC)
• Multiplex equipment clocking

Application Specific Clock/Timing Part Context

This part belongs to the MSTM-S3 series of Stratum 3 timing modules from Connor-Winfield. These modules are engineered to replace discrete oscillator and phase-locked loop components in timing-sensitive infrastructure. The specific model suffix indicates the nominal frequency or configuration variant within the Stratum 3 product line, distinct from standard crystal oscillators like the HSM or CWX series.

Application Specific Clock/Timing Replacement Considerations

Direct replacement requires verifying pinout compatibility and electrical interface specifications with the target system design. While other Stratum 3 modules may offer similar compliance, specific holdover characteristics and output frequency ranges must be confirmed against the original design requirements.