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JUNOS 10.1 Network Interfaces Configuration Guide
Configuring the T3 CSU Compatibility Mode
Subrating a T3 interface reduces the maximum allowable peak rate by limiting the
HDLC-encapsulated payload. Subrate modes configure the PIC to connect with channel
service units (CSUs) that use proprietary methods of multiplexing.
You can configure T3 interfaces to be compatible with a Digital Link, Kentrox, or
Larscom CSUs. For T3 intelligent queuing (IQ) channels only, you can also configure
Adtran or Verilink CSU compatibility.
NOTE: To subrate an E3 interface to be compatible with a Kentrox CSU, you must
have an IQ or IQE based PIC. Non-IQ or IQE PICs allow a commit of the configuration,
but the interfaces remain at the full E3 rate for the Kentrox compatibility mode.
4-port and 2-port channelized DS3(T3) IQ PICs do not support Adtran and Verilink
compatibility modes. If configured, the default mode is applied on both the interfaces,
that is, no subrating.
To configure a T3 interface so that it is compatible with the CSU at the remote end
of the line, include the
t3-options]
The subrate of a T3 interface must exactly match that of the remote CSU. To specify
the subrate, include the
590
Configuring the T3 CSU Compatibility Mode
[edit interfaces interface-name t3-options]
cbit-parity;
compatibility
hierarchy level:
[edit interfaces interface-name t3-options]
compatibility-mode (adtran | digital-link | kentrox | larscom | verilink) <subrate value>;
subrate
For Adtran CSUs, specify the subrate as a number from 1 through 588 that exactly
matches the value configured on the CSU. A subrate value of 588 corresponds
to 44.2 Mbps, or 100 percent of the HDLC-encapsulated payload. A subrate value
of 1 corresponds to 44.2 / 588, which is 75.17 Kbps, or 0.17 percent of the
HDLC-encapsulated payload.
For Digital Link CSUs, specify the subrate as the data rate you configured on the
CSU in the format xKb or x.xMb. For Digital Link CSUs, you can specify the
subrate value to match the data rate configured on the CSU in the format
x.xMb
. You can configure the subrate values shown in Table 54 on page 591.
For Kentrox CSUs, specify the subrate as a number from 1 through 69 that exactly
matches the value configured on the CSU. A subrate value of 69 corresponds to
34.995097 Mbps, or 79.17 percent of the HDLC-encapsulated payload (44.2
Mbps). A subrate value of 1 corresponds to 999.958 Kbps, which is 2.26 percent
of the HDLC-encapsulated payload. Each increment of the subrate value
corresponds to a rate increment of about 0.5 Mbps.
For Larscom CSUs, specify the subrate as a number from 1 through 14 that
exactly matches the value configured on the CSU. A subrate value of 14
corresponds to 44.2 Mbps, or 100 percent of the HDLC-encapsulated payload.
statement at the
[edit interfaces interface-name
statement in the configuration:
or
xkb
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