21-4
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter21 Configuring IMA Port Adapter Interfaces
Configuring the T1/E1 IMA Port Adapter
Clock source = system clock
Transmit clock source = network derived
Loopback = no loopback
BERT = disabled
The following port adapter types have specific defaults assigned.
T1 port adapter:
Framing = extended super frame (ESF)
Line build-out (LBO) = short 133
Linecode = b8zs
Facilities Data Link (FDL) = no FDL
Yellow = enabled
E1 port adapter:
Framing = pcm30adm
Line build-out (LBO) = short gain12 22db
Linecode = hdb3
National bits = 1 1 1 1 1 1
The following defaults are assigned to all IMA groups:
Minimum number of active links = 1
Clock mode = common
Differential delay = 25 milliseconds
Frame length = 128 cells
Test link = first link in the group
Test pattern = value of test link
Configuring the T1/E1 IMA Interface
To manually change any of your default configuration values, perform the following steps, beginning in
global configuration mode:
Note IMA is only possible on switches with FC-PFQ installed.
Command Purpose
Step1 Switch(config)# interface atm card/subcard/port
Switch(config-if)#
Specifies the ATM interface and enters interface
configuration mode.
Step2 Switch(config-if)# bert pattern {2^15 | 2^20 |
2^23 | 0s | 1s | 2^11 | 2^20-QRSS | alt-0-1}
interval minutes
Configures the bit error rate test pattern.