Here's some info on CAT 7 ethernet cables:
Specifications of the Cat 7 Ethernet Cable
Cat-7 cabling supports frequencies of up to 600 Mhz and speeds of up to 10,000 Mbit/s.
This is a big improvement on previous network cabling speeds (CAT 3: 10 Mhz, CAT 5: 100Mhz, CAT 6: 250 Mhz).
Cat 7a cables can perform up to frequencies of 1000 Mhz and 40 Gbit/s.
CAT7 cables feature even more strict specifications for crosstalk and system noise then CAT 6.
This is achieved through shielding on the individual wire pairs and the cable as a whole.
Category 7 is recognized for all the country organizations members of ISO.
Uses for Cat 7 Cables
Cat-7 network cables can be used for 1000Base-TX, 100Base-T & 10Base-T networking and Cat-7a cables can go up to 10Gbase-T (10-Gigabit Ethernet).
It is important to remember that your network will not perform at Gigabit speeds, unless all of the components are validated at Gigabit speeds.
So you will need not only need gigabit cables, but you will need a gigabit switch, router or hub and also gigabit network cards.
There are two types of Cat7 cables.
One of them is a cross-over cable that is used to connect two devices directly to eachother, eg. a PC directly to another PC or a Hub to another Hub.
However, the majority of Cat7 cables are straight through cables, and these are used to connect computers to hubs and switches.
You can read more about this on the computer network cable page.
CAT7 Cables Summary
CAT7 Cables can either be crossover or straight through cables
CAT7 cables are fairly new and becoming more popular
CAT7 Network Cables support frequencies of up to 250Mhz (CAT 7a up to 500Mhz) and speeds of up to 1000 Mbit/s (CAT 7a up to 10Gbit/s)