T4000 Sonet Clock Generators (Scgs) Leds; Figure 28: Scg With Rj-48 Ports - Juniper T4000 Hardware Manual

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T4000 SONET Clock Generators (SCGs) LEDs

Copyright © 2013, Juniper Networks, Inc.
The SCG with RJ-48 ports is shown in

Figure 28: SCG with RJ-48 ports

Online/Offline button
Fail Master
OK
Each SCG consists of the following components:
19.44-MHz Stratum 3 clock.
Field-programmable gate array (FPGA) that performs multiplexing of clock sources.
SCG online/offline button, located on the SCG faceplate.
Two external clock inputs.
NOTE: The external clock ports are not supported on the SCG with DB-9
ports.
For information about configuring external clock synchronization for T Series routers,
see the Junos OS Administration Library for Routing Devices.
For information about configuring an interface transmit clock, see the Router Interfaces.
Three LEDs— , , and
OK FAIL
status of the SCG.
T4000 SONET Clock Generators (SCGs) LEDs on page 51
Connecting the T4000 Router to an External Clocking Device on page 115
Maintaining the T4000 SCGs on page 187
Troubleshooting the T4000 SCGs on page 208
Three LEDs, located on the SCG faceplate, display the status of the SCG.
Table 24 on page 52 describes the functions of the SCG LEDs. Two
on the left of each RJ-48 port, display the status of the external clock inputs links. The
other LEDs on the right of each port are not used.
Figure 29 on page 52 shows the LEDs on the SCG with RJ-48 ports.
Chapter 3: T4000 Hardware Components Overview
Figure 28 on page
EXTERNAL CLOCK INPUTS
, located on the SCG faceplate, that display the
MASTER
51.
LEDs, located
LINK
51