Location Of Advanced Clocking Module In The Chassis; Advanced Clocking Module - Juniper BX7000 Hardware Manual

CHAPTER 1: BX7000 Multi-Access Gateway Overview

Location of Advanced Clocking Module in the Chassis

14

Advanced Clocking Module

An external source is derived from a signal coming into the gateway. These include:
A building-integrated timing supply (BITS) clock source supplied to the advanced clocking
module using a T1 or E1 connection using a Category 3 cable with an RJ-45 connector
One pulse per second (1PPS) input using BNC co-axial cable connected to the BNC connector
10 MHz, LVCMOS input using BNC co-axial cable connected to the BNC connector
IEEE 1588 PTP clock sources are rated by quality, or stratum level, where 1 represents the highest
possible quality of clocking. The advanced clocking module supports Stratum 3 level clock
synchronization.
All clock sources must conform to the following specifications:
ITU-T G.823/G.824 for E1/T1 clock requirements
PTP IEEE1588 support for slave mode
Note: The gateway supports only IEEE1588 slave mode.
You can configure the priority of the available clock sources from 1 through 7. The clock source with
priority one is locked and distributed to the TDM interfaces of the gateway. As the port providing
the clock source might fail, the priority for reference clock sources is programmable. For more
information about configuring the priority of a clock source, see the BXOS Configuration Guide.
Figure 10: Advanced Clocking Module
The Clock Card Expansion Bay accommodates the advanced clocking module. The advanced
clocking module is installed into the slot on the front of the gateway that is located above the
Interface Card Expansion Bay. shows the position of the advanced clocking module on the
chassis. For more information about configuring the advanced clocking module, see the BXOS
Configuration Guide.
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