R2511-HP MSR Router Series Interface Configuration Guide(V5)

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Configuring an IMA-E1/T1 interface
Overview
The IMA-E1/T1 interface configuration includes two parts: physical parameters of ATM E1/T1 interfaces
and IMA features. If no IMA group is configured for transmitting ATM cell streams, the cells are
distributed directly over E1/T1 links. You can, however, assign multiple IMA-E1/T1 interfaces to an IMA
group to form a higher-speed IMA interface link for ATM cell transmission.
For both IMA groups and the E1/T1 links outside the groups, you can create PVCs, specify service types,
and configure the related parameters. For more information (including the configuration of PVCs), see
Layer 2—WAN Configuration Guide.
The following matrix shows the interface and router compatibility:
Interface MSR900 MSR93X
MSR20-1
X
MSR20 MSR30 MSR50 MSR1000
IMA-E1/T1 No No No No Yes Yes No
Configuration procedure
To configure an IMA E1/T1 interface:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter ATM E1/T1 interface
view.
interface atm interface-number N/A
3. Set the clock mode.
clock { master | slave }
Optional.
The default setting is slave.
4. Enable automatic clock
mode change.
clock-change auto
Optional.
This function is disabled by default.
5. Set the framing format.
• On an E1 interface:
frame-format { crc4-adm |
no-crc4-adm }
• On a T1 interface:
frame-format { esf-adm |
sf-adm }
Optional.
By default, the framing format for
an E1 interface is CRC4 ADM and
that for an T1 interface is ESF
ADM.
6. Set the line coding format.
• On an E1 interface:
code { ami | hdb3 }
• On a T1 interface:
code { ami | b8zs }
Optional.
The default line coding format for
an E1 interface is HDB3 and for a
T1 interface is B8ZS.
7. Enable scrambling.
scramble
Optional.
Scrambling is enabled by default.