User's Manual

Navini Networks, Inc. Ripwave Base Station I&C Guide
Part #40-00047-00 Rev D v1.0 85
February 28, 2003
Each group identifies a set of T1 ports that are being combined to form one larger virtual port.
For the sake of boot parameter specification, ALL T1 interfaces for the Management PVC’s
IMA group are assumed to be identical. So the parameters for T1 specifications apply to all T1’s
of the IMA group:
pvc type-atm i/f : ima-0
Once the IMA interface is selected, a set of IMA parameters must be specified for the IMA
group used by the Management PVC. An IMA group inherently supports dynamic addition and
drops of individual T1 facilities from the group to facilitate fault tolerance to failed T1 facilities.
The minimum number of T1 ports, or links, that must exist for the IMA group to function is
specified here. A value from 1-7 is required for each of the receive and transmit directions.
Separate the values with “:”. You can increase the values from the default of 1 link in each
direction or accept the default by pressing the Enter key.
ima min rx:tx links : 1:1 [1-7:1-7]
Next, specify which T1 ports are used to form the IMA group. This is a list of T1 port identifiers
(1-8), each separated by commas. The BTS makes sure you enter at least as many links as you
specified for the minimum requirements above:
selected ima links : 1,2,3,4,5,6,7,8
The near- and far-end IMA protocols use an ID number to identify each other. This value must
agree with that provisioned at the far-end of the IMA link. The BTS defaults to a value of 0, but
you can specify any value from 0 to 255:
ima group id : 0 [0-255]
Group symmetry modes allow symmetric or asymmetric operation of IMA links:
ima symmetry : sym [sym|asym|asym-cfg]
IMA frame length specifies the size of the IMA frames that are being transmitted:
ima frame length : 128 [32|64|128]
The IMA alpha/beta/gamma parameters are used by the IMA frame synchronization mechanism.:
ima alpha:beta:gamma : 2:2:1 [1-2:1-5:1-5]
The IMA clock mode selects either a common or independent IMA clock mode (Exhibit 6). It is
the same as for ATM/T1.