Implement separation of line/TEI/datalinks in E1 pcap
Actually, the fact that we only have a single pcap file for potentially multiple lines is a problem.
Classic pcap files do not offer a way to annotate each packet with information on which interface it was received, so you cannot distinguish traffic from multiple lines.
We need to address this in a generic way.
Ideally generating pcap-ng with interface descriptions, or by moving pcap generation to "per line".
But even a single line can contain multiple TEI / datalinks, and you want to somehow separate those.