M88 IEEE 1588 Module

(Master, Slave, Boundary Clock)

The M88 combines a high precision IEEE1588-2008 PTP packet gateway clock with Silicon Labs’ Si5348 ultra‐low jitter network synchronizer. The M88 is a turnkey (hardware and software) solution that provides IEEE 1588 and SyncE standards‐compliant phase and frequency synchronization, jitter attenuation, and clock generation in a unified, small form factor design.

Multi-sync & Algorithms + System Features + Network Interface

The M88 is a clock module that is suitable for wireless backhaul, IP radios, small and macro eNodeBs and datacenter switches. It is ideal for implementing a highly precise clock system for communications equipment.

The M88 module provides PTP functionality (Master, Slave, Gateway or T-BC) together with several other low-jitter timing outputs. Industry-leading algorithms deliver high performance with respect to the ITU-T G.8261 test suite, even with inexpensive oscillators. The M88 can take a GNSS reference signal when available, and can also handle up to 4 frequency inputs.

It has three DSPLLs that can be independently configured for SyncE or IEEE 1588 DCO operation. The unique design enables precise time adjustments for 1588 clock steering applications and for using a reference input from a TCXO or OCXO.

The M88 is easy to use and highly programmable, simplifying control, configuration and operation.

Block Diagram

System Features

  • Assisted Partial Timing Support Clock
    (APTSC ) G.8273.4
  • Telecom Boundary Clock
    (T-BC) ITU-T G8273.2 1
  • Multi-Sync handling support
  • Phase accuracy better than ±1 µs
  • Fractional Frequency Offset better than 1 ppb under ITU-T test conditions1

Network Interface

  • 2x RGMII ports
  • Integrated TCP/IP stack
  • IPv4 and IPv6 (PTP)

1ITU-T G.8261 & ITU-T G8273.2 tests conducted at internal labs and 3rd party labs – details available on request and under NDA



  • Unified full clock solution
  • Synchronizes to GNSS, SyncE, BITS, PTP (IEEE-1588 2008)
  • Industry-leading IEEE 1588 time & frequency recovery algorithms
  • Gateway and boundary clock
  • Supports one-step and two-step clock
  • Telecom, power & default profiles
  • Industry leading algorithm for G.8261
  • Meets the requirements of:
    • ITU-T G.8261, G.8265, G.8275
    • ITU-T G.8273 T-GM, T-BC and T-SC
    • ITU-T G.8262 (SyncE) EEC Options 1&2
    • ITU-T-G.813 Option 1
    • Telcordia GR1244,GR253 (Stratum 3/3E)
  • Flexible frequency synthesis with multiple outputs
  • Scalable to 128 PTP clients


  • Mobile Backhaul Carrier Ethernet
  • Macro / micro eNodeB and small cells (eNodeBs)
  • C-RAN BBU to RRH sync
  • Data center switches
  • Broadband access - G.fast, xDSL and xPON)
  • Broadcast video genlock (SMPTE 2059)


  • Easy & rapid integration in host system
  • Full clock subsystem, lower design cost
  • Excellent phase noise performance
  • Low power consumption
  • Ultra-low jitter network-synchronized multiple frequency outputs

Technical Specifications


  • 5x low-jitter (low phase noise) outputs
    • Programmable frequency up to 350 MHz;
    • Can be locked to any reference input
    • Programmable loop B/W per DSPLL: 1 MHz-4 kHz
  • Additional 5/10/20/25 MHz synthonized output
  • Time outputs: 1 PPS & ToD (time of day)
  • IEEE 1588 (PTP) output (in GM mode)
    • May be locked to GNSS, or PTP (in gateway clock mode), or external 1 PPS / ToD

Timing References (Inputs)

  • 1 PPS / ToD
  • Alternative PPS
  • PTP
  • SyncE
  • External oscillator
  • 3 x frequency inputs

Physical Interfaces

  • 2 x GbE RGMII signal
  • Clock inputs/outputs configurable for LVDS, LVPECL, LVCMOS, HCSL, CML

PTP Master

  • Accuracy with GPS as reference better than ±25ns
  • Support one step and two step operation
  • Message rates up to 128 packets per second
  • Multicast and unicasr operation

Other Features

  • DHCPv4 client; FTP server; TELNET server; SSH server; serial terminal
  • Remote firmware upgrade
  • Command line interface configuration (Telnet, SSH or serial port terminal)

ToD Format (output)

  • ASCII, NMEA and China Mobile Binary format

Physical Interfaces

  • GPIO, Asynchronous serial, SPI, RGMII and MDIO

Operating Specifications

  • Supply: 3.3 V, 1.8 V, 1.2 V +/- 10%
  • Operating temperature: 0 ºC to 70 ºC
    (-40 ºC to 85 ºC optional)
  • RoHS compliant
  • Low power dissipation: 1.1 W (typical)

Physical Specifications

  • Package: LGA-144
  • Size: 29.2 mm X 29.2 mm
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