Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual page 591

Engine. This feature, known as drop and insert, allows you to integrate voice and
data on a single T1 or E1 link by removing the DS0 time slots of one T1 or E1 port
and replacing them by inserting the time slots of another T1 or E1 port. It is not
necessary to use the same time slots on both interfaces, but the time slots count
must be same. The channels that are not configured for the drop-and-insert feature
are used for normal traffic.
You can configure:
30 channelized E1 time slots, with the 16th time slot operating as the signaling
channel
23 channelized T1 time slots, with the 24th time slot operating as the signaling
channel
The signaling channel, or D-channel, must be part of the channels that are being
switched through the drop-and-insert functionality. The JUNOS Software does not
support switching of voice and data between ports by default.
Both ports involved in the drop-and-insert configuration must use the same clock
source—either the router's internal clock or an external clock.
The following clock source settings are valid:
When port 0 is set to use the internal clock, port 1 must also be set to use it, and
vice versa.
When port 0 is set to use its external clock, port 1 must be set to run on the
same clock—the external clock for port 0.
When port 1 is set to use its external clock, port 0 must be set to run on the
same clock—the external clock for port 1.
For more details about valid clock combinations, see the JUNOS Software Interfaces
and Routing Configuration Guide.
To configure drop-and-insert time slots on a channelized T1 interface, include the
statement at the
partition
timeslots statement and interface-type
[edit interfaces]
ct1-pim/0/port {
partition 1 timeslots 1-10 interface-type ds;
partition 2 timeslots 11-14 interface-type ds;
partition 3 timeslots 15-32 interface-type ds;
}
This configuration creates interfaces
ds-pim/0/port:3 .
Use the same configuration to create drop-and insert time slots on a channelized E1
interface by including the
ce1-pim/0/port] hierarchy level.
Configuring a Channelized T1/E1 Interface to Drop and Insert Time Slots
Chapter 25: Configuring Channelized E1 PRI and T1 PRI Interfaces
[edit interfaces ct1-pim/0/port]
statements specified:
ds-pim/0/port:1
statement and options at the
partition
hierarchy level with the
, , and
ds-pim/0/port:2
[edit interfaces
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