ZL30791, ZL30795, ZL30793

Product Brief

5

Microsemi Confidential

4. Software Features

The following figure shows the Time Synchronization Algorithm system environment. The subsections below list the

features of the Time Synchronization Algorithm.

Host Processor

Transport

Layer

Protocols

Microsemi

ZLS30390

IEEE 1588-2008

Protocol Engine

Microsemi

ZLS30380

Time Sync

Algorithm

Microsemi

PLL

SyncE/

Stratum 3/

GNSS/

IEEE 1588

Microsemi

Ethernet

MAC & PHY

(Timestamp)

Operating System

Application Layer

Control, Configuration, Stats & Alarms

Packet

Network

Clock

PPS

Timestamp Reference Clock

4.1

Time Synchronization Algorithm

The Time Synchronization Algorithm is responsible to accurately synchronize the local clock to a selected Server.

The Time Synchronization Algorithm is synchronizing the Client to the Server to meet a variety of specifications or

applications related to frequency accuracy (FFO), frequency (MTIE, TDEV), phase (1 Hz or 1PPS) and time (UTC

& GNSS/GPS).

The Time Synchronization Algorithm can run on a variety of host processor architectures, whether embedded into

an SoC or on a dedicated small scale CPU (such as Microsemi’s SmartFusion2 SoC FPGA). The Time

Synchronization Algorithm will interconnect with a wide array of software-programmable clock generators (such as

Microsemi’s Network Synchronizer PLLs), protocol engines (such as Microsemi’s ZLS30390 IEEE 1588-2008

Protocol Engine) and underlying Ethernet MACs and PHYs that perform hardware timestamping.

4.2

End Application Target Performance

The Time Synchronization Algorithm is suitable for many end application targets, including:

•

Frequency offset accuracy performance for GSM, WCDMA-FDD, LTE-FDD femtocell, small cell

(residential, urban, rural, enterprise), picocell and macrocell applications, with target performance less than

± 15 ppb

•

Frequency performance for ITU-T G.823 and G.824 synchronization interface, as well as G.8261 PNT

EEC, PNT PEC and CES interface specifications

•

Phase Synchronization performance for WCDMA-TDD, Mobile WiMAX, TD-SCDMA, CDMA2000, LTE-

TDD, LTE-A, LTE-A Pro and 5G NR femtocell, small cell (residential, urban, rural, enterprise), picocell and

macrocell applications with target performance less than ± 1

s phase alignment

•

Time Synchronization for TAI, UTC-traceability and GNSS/GPS replacement

4.3

Packet Networks

The Time Synchronization Algorithm is suitable for high performance over a variety of packet networks including:

•

ITU-T G.8261 Appendix VI

•

ITU-T G.8261.1 network limit compliant

•

ITU-T G.8271.1 network limit compliant without SyncE

•

ITU-T G.8271.2 network limit compliant