T1/E1 jumper on TE11xP, TE2xxP, and TE4xxP

These cards have a physical jumper for selecting whether the ports are T1 (open) or E1 (closed).
But there is also a software override for the jumper in the wct4xxp and wct11xp drivers. (See http://kb.digium.com/entry/1/121/)

To set all spans to E1 mode, use:

insmod wct4xxp t1e1override=0xFF

To set all spans to T1 mode, use:

insmod wct4xxp t1e1override=0x00

An even easier way is to add this to your /etc/modprobe.d/zaptel file:

options wct4xxp t1e1override=0xFF

The argument is a bitmask, which can be used to set each span separately, if that is needed for some reason. Span 1 is 0x01, span 2 is 0x02, span 3 is 0x04, and span 4 is 0x08. For example, "t1e1override=0x0B" would set spans 1, 2, and 4 to E1 mode, and leave span 3 in T1 mode.