Capturing with Ethereal is a different story. I saw some talk recently
about a patch to libpcap (used by tcpdump and Ethereal) to support
native capturing on Septel cards (probably if you compile your own
version with a special 'configure' option).
That's in the libpcap 0.9[.x] source. You do need to recompile libpcap,
with a special configure option, as that feature uses Intel's
Septel/NetStructure software - libpcap has to be linked with it. It
should work on Linux. It might be possible to make it work on Solaris;
somebody with Solaris and Septel/NetStructure cards and software would
have to do the work (which would involve transplanting the changes made
to pcap-linux.c to pcap-dlpi.c).
It might also be possible to capture it with some DAG cards from Endace
and the latest version of DAG software, as well as libpcap 0.9[.x] - if
you have an "HDLC" line, the link-layer type choices (which should
appear in the Ethereal GUI) offered are Cisco HDLC, PPP, Frame Relay,
and SS7 MTP2.
