ITU-T G.8263-2012
Timing characteristics of packet-based equipment clocks (Study Group 15)

Standard No.

ITU-T G.8263-2012

Release Date

2012

Published By

International Telecommunication Union (ITU)

Latest

ITU-T G.8263-2012

Scope

This Recommendation outlines minimum requirements for the timing functions of the Packet Slave Clocks as defined in G.8265. It supports frequency synchronization distribution when using packet based methods. This Recommendation allows for proper network operation when a Packet Slave Clock is timed from a Packet Master Clock as defined in G.8265. This Recommendation focuses on mobile applications, and in particular on the delivery of frequency synchronization for end applications such as mobile base stations. It supports the architecture defined in Recommendation G.8265. Other applications are for further study. This Recommendation focuses on two different deployment cases for the Packet Slave Clock: Packet Slave Clock embedded in a device co-located with the end application, as shown after the connection C1 in Figure 3 of Recommendation G.8261.1 Packet Slave Clock embedded within the end application, as shown after the connection C2 in Figure 3 of Recommendation G.8261.1. This second case is for further study for the first version of this Recommendation other deployment cases for the Packet Slave Clock are for further study. This Recommendation focuses on the types of networks corresponding to the HRM-1 and HRM-2 as defined in G.8261.1. Note: the HRM-2 type of network is for further study for the first version of this Recommendation. Other types of networks are out of the scope of this Recommendation. This Recommendation defines the minimum requirements for the Packet Slave Clocks. These requirements apply under the normal environmental conditions specified for the equipment. This Recommendation includes clock accuracy, Packet Delay Variation noise tolerance, holdover performance and noise generation. The start-up conditions (e.g. variable filtering bandwidth at start-up, stabilization period, etc.) are for further study.

ITU-T G.8263-2012 Referenced Document

• ITU-T G.810-1996 DEFINITIONS AND TERMINOLOGY FOR SYNCHRONIZATION NETWORKS Study Group 13
• ITU-T G.811-1997 Timing Characteristics of Primary Reference Clocks - Series G: Transmission Systems and Media Digital Systems and Networks Digital Transmission Systems - Digital Networks - Design Objectives for Digital Networks Study Group 13; 10 pp
• ITU-T G.823-2000 Control of Jitter and Wander within Digital Networks Which Are Based on the 2048 KBIT/S Hierarchy Series G: Transmission Systems and Media Digital Systems and Networks; Digital Networks - Quality and Availability Targets
• ITU-T G.824-2000 Control of Jitter and Wander Within Digital Networks Which are Based on the 1544 kbit/s Hierarchy - Series G: Transmission Systems and Media Digital Systems and Networks Digital Transmission Systems - Digital Networks - Quality and Availability Targets St
• ITU-T G.8260-2012 Definitions and terminology for synchronization in packet networks (Study Group 15)
• ITU-T G.8261-2008 Timing and synchronization aspects in packet networks (Study Group 15)
• ITU-T G.8261.1-2012 Packet delay variation network limits applicable to packet-based methods (Frequency synchronization) (Study Group 15)
• ITU-T G.8265-2010 Architecture and requirements for packet-based frequency delivery (Study Group 15)
• ITU-T G.8265.1-2010 Precision time protocol telecom profile for frequency synchronization (Study Group 15)

ITU-T G.8263-2012 history

• 2012 ITU-T G.8263-2012 Timing characteristics of packet-based equipment clocks (Study Group 15)