Juniper JUNOSE 11.2.X MULTICAST ROUTING, Руководство по настройке

Страница: 132 / 256

NOTE: To configure a whole T1 or E1 line, assign 24 T1 or 31 E1 timeslots to a channel
group or configure an unframed E1 line.
To identify a controller over SONET/SDH VT, you must consider the multiplexing for
SONET and SDH
virtual tributaries . In SONET, an STS-1 frame can be divided into seven
virtual tributary (VT) groups. Similarly, for SDH, an STM-0 frame can be divided into
seven tributary units (TUs). Each group or unit contains a number of virtual tributaries;
that number depends on the VT type or TU name. Table 10 on page 110 lists the VT types
and TU names that the router supports.
Table 10: Tributary Standards That cOCx/STMx Interfaces Support
Signal Standard
Number of
Tributaries in a Group
TU Name (SDH)
VT Type
(SONET)
T1 4 TU-11 VT1.5
E1 3 TU-12 Not supported
Figure 9 on page 110 shows the structure for SONET, and Figure 10 on page 111 shows the
structure for SDH.
Figure 9: SONET Multiplexing
Copyright © 2010, Juniper Networks, Inc. 110
JunosE 11.2.x Physical Layer Configuration Guide