This is the only link I could get. You need to search under MAPLIN CODE: SN90X
In-line connector for joining two RJ45 (FCC 8P8C) modular plugs. Two versions are available:
TZ09K RJ45 Coupler
SN90X Reverse Coupler RJ45
I am not too familiar with networking PCs, however
with regard to TCP/IP addresses; is there a format that is required when networking p-p.