hi, this small tool is used to enable layer 1 and 2 on a given isdn card. the card can be used to retrieve clock signal from a network. layer 2 (PTP) is required to keep layer 1 without interruption. this tool works on e1 and s0 cards. to use the clock signal with other cards, interconnection with a clock-slave-card is required. this tool is GPL v2. the import to the subversion server on bs11-abis.gnumonks.org is welcome. a documentation with card interconnection howto does not exist, but if someone really successfully connects two cards (HFC-S PCI and HFC-E1), we can write one from these experiences. regards, andreas