CHAPTER 1: BX7000 Multi-Access Gateway Overview
14
Advanced Clocking Module
Copyright © 2010, Juniper Networks, Inc.
An external source is derived from a signal coming into the gateway. These include:
z
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
z
One pulse per second (1PPS) input using BNC co-axial cable connected to the BNC connector
z
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:
z
ITU-T G.823/G.824 for E1/T1 clock requirements
z
PTP IEEE1588 support for 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
Location of Advanced Clocking Module in the Chassis
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
.
Note:
The gateway supports only IEEE1588 slave mode.
Summary of Contents for BX7000
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Page 18: ...About This Guide xviii Requesting Support Copyright 2010 Juniper Networks Inc ...
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Page 90: ... 72 Copyright 2010 Juniper Networks Inc ...
Page 122: ... 104 Hardware Compliance Copyright 2010 Juniper Networks Inc ...
Page 131: ...Copyright 2010 Juniper Networks Inc 113 Appendix E Declaration of Conformity ...
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Page 133: ...Copyright 2011 Juniper Networks Inc 115 PART 4 Index z Index on page 117 ...