PCM4L datasheet(1/38 Pages) RENESAS

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Datasheet

R31DS0087EU0101 Rev.1.01

Page 1

Sep.28.21

The PTP Clock Manager for Linux (pcm4l) is

designed as a high-performance clock recovery

solution for packet-based time/phase/frequency

synchronization. The pcm4l software includes the

features required to meet the ITU-T Telecom packet

equipment clock recommendations, including a

packet clock state machine.

In complex networks with partially unknown packet

delays, typical in telecom applications, pcm4l offers

patented filter algorithms that help to improve

synchronization accuracy with time/phase accuracy of

under 1 microsecond and frequency accuracy of

under 16 parts-per-billion (ppb).

In networks with full IEEE 1588 support that are made

up of Boundary Clock (BC) or Transparent Clock (TC)

nodes, the pcm4l offers an outlier detection algorithm,

used in conjunction with the Renesas ITU-T G.8273.2

hardware filter, which helps to improve

synchronization accuracy with time/phase accuracy of

under 5ns filtered (provisional Class D). These tight

requirements dictate the use of timing hardware for

the synthesis of the physical clock.

The adaptive servo is implemented in software

running on a host processor that controls the PTP

Hardware Clock (PHC). The IEEE 1588 protocol also

runs on a host processor but does not need to be co-

located with pcm4l (i.e., a different processor). The

pcm4l architecture and interfaces makes it ideal for

open-source architectures, such as White Box

hardware and O-RAN.

For more information about the PTP Clock Manager,

see the pcm4l product page.

Application Standards

▪ ITU-T G.8275.1 Appendix V and G.8275.2

Appendix IV PTP clock state machine

▪ ITU-T G.8273.4 T-BC-P/T-TSC-P

▪ ITU-T G.8263 PEC-S-F

▪ ITU-T G.8265.1 Master Selection Algorithm (MSA)

Features

▪ Filters the effects of high Packet Delay Variation

(PDV) per G.8273.4 or G.8263

▪ Calibrates for asymmetry when an external local

time reference is available per G.8273.4 APTS

▪ Software provided as clear C code, ready for Linux

distributions

• Runs on Linux kernel v3.0 and higher, using the

PTP Hardware Clock Infrastructure for clock

control

• Dramatically simplifies software integration and

debugging

▪ Support for IEEE1588-2019 Slave Event

Monitoring channel to allow for a timestamp

interface to an external PTP stack

▪ Full PTP clock state machine per ITU-T G.8275.1

Appendix V and G.8275.2 Appendix IV

Applications

▪ Wireless infrastructure for 4.5G and 5G network

equipment

▪ Phase/time synchronization with full timing support

from the network per ITU-T G.8275.1

• Telecom Boundary Clocks (T-BCs) and Telecom

Time Slave Clocks (T-TSCs) according to ITU-T

G.8273.2 for Full Timing Support (FTS) networks

▪ Phase/time synchronization with assisted or partial

timing support from the network per ITU-T

G.8275.2

• Telecom Boundary Clocks (T-BCs) and Telecom

Time Slave Clocks (T-TSCs) according to ITU-T

G.8273.4 for Assisted Partial Timing Support

(APTS) or Partial Timing Support (PTS)

networks

pcm4l

PTP Clock Manager for Linux

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