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JunosE 11.2.x Physical Layer Configuration Guide
Numbering Scheme
112
Table 12: Definitions for Identifiers for SONET/SDH VT Controllers
(continued)
Identifier
Definition
tributaryGroup
Number of the tributary
group within the path
tributaryNumber
Number of the tributary
within the group
channelGroup
A fraction of a T1 or an E1
line
T3 Controllers
You can configure the STS-1 frame to carry a single T3 signal through asynchronous
mapping. As Figure 9 on page 110 shows, T3 on cOCx/STMx interfaces supports the
following options:
An unchannelized T3 controller
A T3 controller channelized to DS0 (fractional T1). To configure fractional T1 over T3
on cOCx/STMx interfaces, you assign timeslots (also known as subchannels) to the T1
channel. Each T1 channel supports 24 T1 timeslots.
For any configuration, you must identify the path and each controller in the layers above
the path layer. For example, for a T3 controller channelized to T1, you must identify the
path channel, the T3 channel, and the T1 channel. Table 13 on page 112 presents the
identifiers for the T3 configurations.
Table 13: Identifiers for T3 Controllers
Configuration
Unchannelized T3
T3 channelized to DS0
HDLC
You must configure HDLC over the T3, unframed E1, or fractional T1/E1 line that you
configure on an interface. As Figure 8 on page 109 shows, HDLC is at the top layer of the
interface stack.
A cOCx/STMx interface is identified by the slot/port format, where:
Value
In SONET mode, tributary group is the number
of the VT group. In SDH mode, tributaryGroup
is the number of the TUG-2 group.
In SONET mode, tributaryNumber is the
number of the VT. In SDH mode,
tributaryNumber is the number of the TUG-1
group or tributary unit.
A number in the range 1-24 for T1 or 1-31 for
E1
Identifier
pathChannel/ds3-
channel-number
pathChannel/ ds3Channel-number/ ds1-
channel-number/subchannelNumber
Copyright © 2010, Juniper Networks, Inc.
Example
1/1
1/1/10/15
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