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Knowledge Base / Hardware / Products / Digital Interface Cards / Quad Span / TE411P /
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How do I change the type of line from E1 to T1/J1 without using jumpers?

If you do not have physcial access to the card, and you need to set it in T1 or E1 mode you can pass a special option when loading the module to accomplish this task: 

insmod wct4xxp t1e1override=0xFF

This will set all four spans into E1 mode. 

insmod wct4xxp t1e1override=0x00

This will set all four spans into T1 mode.

If you need some spans T1 and some E1 use the following guidelines.

The settings of the spans must be passed as a bitmask in the module paramater. To create the bitmask use the table below adding the value of the numbers corrisponding to the spans you wish to enable.

span value
1 1
2 2
3 4
4 8

So to enable spans 1 and 4 you would call modprobe like so: 

modprobe wct4xxp t1e1override=0x09

As you can see I added 1 and 8 to get 9. Remember if you pass this value in HEX to format it properly.

To make spans 1, 2, and 4 E1 spans, you would use the following parameter:

... t1e1override=0x0B
or
... t1e1override=11
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