All this talk of gender benders and null-modem adapters is exactly why I use the Yost serial connector scheme: http://yost.com/computers/RJ45-serial/ My notes from http://ntp.isc.org/Support/ConfiguringParseRefclocks say I used DCE adapters for the serial ports on our Meinberg GPS167BGT and a DTE adapter for the Meinberg DCF77-C51 H