Create an IMA group and add T1s

Create one or more IMA groups, then add multiple T1 ports from a single T1-6 A+T card.

IMA group creation rules

Follow these rules when planning to configure IMA groups for your network:

All T1 ports must be configured with DS1 Mapping set to N/A prior to being added to an IMA group.

On the T1-6 A+T card, the sum of VPs plus VCs of type CBR, VBR, and GFR cannot exceed 60 VCs per card.

On the T1-6 A+T card, the number of VCs of type UBR cannot exceed 600 VCs per card. Create IMA groups on multiple cards if you require more than 600 UBR VCs.

A T1-6 A+T card can be configured for 1:n equipment protection if none of its ports are configured for TDM traffic.

Recommendations for IMA 1.0 compatibility

Use the following practices to ensure compatibility with external devices using IMA 1.0:

Use sequential T1 ports in an IMA group.
OK: Create an IMA group with ports 1-3.
Not OK: Create an IMA group with ports 1,3, and 5.

Wire ports on the Calix T1-6 A+T card to the matching port number on the external device.

Configure the IMA Group to force compatibility with IMA 1.0 devices and older Cisco routers. Change the ALTV_1 parameter to Y (yes) if you have difficulty connecting to an external device using IMA 1.0.

If you are connecting to another Calix C7 shelf or an IMA 1.1-compatible device, these steps are not required.

Procedure to create an IMA group

An IMA group is associated with a single T1-6 A+T card.

Step	Action
1.	On the File menu, click Create > Ports to open the new Ports Creation dialog box.
2.	In the New Ports Creation dialog box do the following: In the Shelf list, click the shelf where the T1-6 A+T card for the IMA group is located. In the Port Type list, click IMA Group. In the list of available IMA Groups, click a group on the T1-6 A+T card to contain the IMA group. Click Add to place the selected IMA Groups in the To Be Created Ports list. Click OK to create the IMA Groups.

Procedure to add T1 ports to an IMA group

All the T1 ports added to an IMA group must be on the same T1-6 A+T card.

Step	Action
1.	On the Navigation Tree, click an IMA group to select it.
2.	In the Work Area, click Provisioning to see the IMA group parameters.
3.	On the Provisioning page, next to the Physical Location Identifiers box, click the Add button to open the New Add T1 IMA dialog box.
4.	In the New Add T1 IMA dialog box, do the following: In the Available Ports list, click the T1 ports to add to the IMA group. Click Add to place the ports in the Selected Ports list. Click OK to add the ports to the IMA group.