SCG Slots
The SCGs are installed into the upper rear of the chassis in the slots labeled
SCG0
and
SCG1
.
SCG Function
SCGs provide 19.44-MHz Stratum 3 clock signal for the SONET/SDH interfaces on the
router.
SCG Redundancy
One SCG is shipped as part of the standard router configuration, but up to two SCGs can
be installed to provide redundancy. A nonredundant SCG is hot-pluggable. For redundant
SCGs, the master SCG is hot-pluggable. If the master SCG is functioning, the backup
SCG is hot-removable and hot-insertable. Removing the backup SCG does not affect
the functioning of the router. Taking the master SCG offline might result in a brief loss of
SONET clock lock while the backup SCG becomes the master.
Supported SCGs
The T4000 router supports the SCG in
Table 23 on page 50
.
NOTE:
Redundant SCGs must be the same model number, except during
upgrade.
Table 23: Supported SCG
First Supported Junos OS
Release
Model Number
Name
12.1
SCG-T-EC
SCG with RJ-48 ports
12.1
SCG-T
SCG with DB-9 ports
SCG Components
The SCG with DB-9 ports is shown in
Figure 27 on page 50
.
Figure 27: SCG with DB-9 Ports
Copyright © 2013, Juniper Networks, Inc.
50
T4000 Router Hardware Guide
Summary of Contents for T4000 -
Page 1: ...T4000 Core Router Hardware Guide Published 2013 08 28 Copyright 2013 Juniper Networks Inc ...
Page 18: ...Copyright 2013 Juniper Networks Inc xviii T4000 Router Hardware Guide ...
Page 26: ...Copyright 2013 Juniper Networks Inc 2 T4000 Router Hardware Guide ...
Page 30: ...Copyright 2013 Juniper Networks Inc 6 T4000 Router Hardware Guide ...
Page 36: ...Copyright 2013 Juniper Networks Inc 12 T4000 Router Hardware Guide ...
Page 78: ...Copyright 2013 Juniper Networks Inc 54 T4000 Router Hardware Guide ...
Page 90: ...Copyright 2013 Juniper Networks Inc 66 T4000 Router Hardware Guide ...
Page 98: ...Copyright 2013 Juniper Networks Inc 74 T4000 Router Hardware Guide ...
Page 100: ...Copyright 2013 Juniper Networks Inc 76 T4000 Router Hardware Guide ...
Page 108: ...Copyright 2013 Juniper Networks Inc 84 T4000 Router Hardware Guide ...
Page 144: ...Copyright 2013 Juniper Networks Inc 120 T4000 Router Hardware Guide ...
Page 168: ...Copyright 2013 Juniper Networks Inc 144 T4000 Router Hardware Guide ...
Page 176: ...Copyright 2013 Juniper Networks Inc 152 T4000 Router Hardware Guide ...
Page 178: ...Copyright 2013 Juniper Networks Inc 154 T4000 Router Hardware Guide ...
Page 190: ...Copyright 2013 Juniper Networks Inc 166 T4000 Router Hardware Guide ...
Page 200: ...Copyright 2013 Juniper Networks Inc 176 T4000 Router Hardware Guide ...
Page 202: ...Copyright 2013 Juniper Networks Inc 178 T4000 Router Hardware Guide ...
Page 212: ...Copyright 2013 Juniper Networks Inc 188 T4000 Router Hardware Guide ...
Page 314: ...Copyright 2013 Juniper Networks Inc 290 T4000 Router Hardware Guide ...
Page 354: ...Copyright 2013 Juniper Networks Inc 330 T4000 Router Hardware Guide ...
Page 358: ...Copyright 2013 Juniper Networks Inc 334 T4000 Router Hardware Guide ...
Page 389: ...PART 6 Index Index on page 367 365 Copyright 2013 Juniper Networks Inc ...
Page 390: ...Copyright 2013 Juniper Networks Inc 366 T4000 Router Hardware Guide ...