Table 6: Advanced Clocking Module Features - Juniper BX7000 Hardware Manual

CHAPTER 1: BX7000 Multi-Access Gateway Overview
16 Advanced Clocking Module
Table 6 on page 16 shows the features of the advanced clocking module.

Table 6: Advanced Clocking Module Features

Hardware features Stratum 3 level clock synchronization
−
Accuracy or adjust range: 4.6 x 10
−
Pull in range: Must be capable of synchronizing to
clock with accuracy with ±4.6 x 10
–7
−
Stability: 3.7 x 10
−
Time to first slip: 6 minutes (255 in 24 hrs)
Integrated design to support synchronization accuracy
− ±50 ppb with OCXO
−
±280 ppb with TCXO
Programmable priority for reference clock inputs
Internal
−
T1/E1 (1.544/2.048MHz) line clocks
−
Ethernet recovered clocks
−
IEEE1588V2 recovered clock
− xDSL NTU-R timing
External
− BITS T1/E1 (1.544/2.048 MHz) through RJ-45 (Cat 3)
−
10 MHz, LVCMOS through BNC connectors (50 ohms
TTL)
Provides synchronized reference clock outputs
Internal
− T1/E1 (1.544/2.048 MHz) line clocks to mother board
and daughter board
−
25 MHz clock to Ethernet interface in mother board
and daughter board
−
8.192 MHz clock to mother board
−
19.44 MHz clock to mother board for differential
clock recovery
Meets ITU-T G.823/G.824 for E1/T1 timing requirements
PTP IEEE1588v2 support for slave mode
Field-replaceable unit but not hot-swappable
Board ID EEPROM and anti-counterfeit for secure
access
Temperature monitoring
Provided with heat sink arrangement for heat transfer
LEDs for synchronization status (reference source lock
or unlock)
Copyright © 2010, Juniper Networks, Inc.
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