Quick answer: Cat 6a carries 500 MHz and Cat 7 carries 600 MHz under ISO/IEC 11801, but the extra 100 MHz rarely changes what a building can run. Both handle 10GBASE-T to 100 m. Cat 7 normally arrives with GG45 or TERA connectors that will not enter an RJ45 port without an adapter, so most US projects stay on Cat 6a and spend the savings on better termination and link testing.
The quote in front of you lists two cable types with a wide price gap and almost identical speed claims. That is the usual starting point for the Cat 6a versus Cat 7 decision. Before you approve either one, you need to know which problems the extra frequency solves, which hardware it forces you to buy, and where the money actually goes on a per-port basis.
What 500 MHz and 600 MHz Actually Buy You
Frequency rating describes the range a pair set can carry while insertion loss and crosstalk stay inside limits. Cat 6a is specified to 500 MHz and Cat 7 to 600 MHz under ISO/IEC 11801, so the paper difference is one fifth of the Cat 6a spectrum. The applications that pay the bills, 10GBASE-T over 100 m and PoE Type 4 at 60 W, were both written around the Cat 6a envelope.
Bandwidth is not throughput
A higher MHz figure does not raise the speed of your network. Both cables run 10GBASE-T across a 100 m channel, and neither one is approved for 25GBASE-T or 40GBASE-T, which belong to Cat 8. Any expectation of double throughput is misplaced; the gain here is margin against alien crosstalk.
Where the extra 100 MHz shows up
The 600 MHz rating earns its keep in dense bundles, in trays that run beside motors and drives, and in shielded routes where coupling between cables is the limiting factor. On short, lightly loaded runs, that headroom rarely changes a test result.
Connectors: GG45 and TERA Against RJ45
Cat 7 was written around shielded cable and a connector that preserves pair isolation to 600 MHz. That is why GG45 and TERA exist. Both keep the four pairs in separated quadrants and both are physically different from the RJ45 plug on the average access switch.
Backward compatibility costs extra
GG45 outlets accept a standard RJ45 plug in a lower compatibility mode and switch to the full four quadrant layout for Cat 7 cords. TERA uses one keyed interface and needs a TERA to RJ45 cord or adapter at every legacy device. Each of those parts is another line item and another failure point.
Shielding and grounding discipline
Cat 7 is shielded by definition, so the job inherits every grounding rule that comes with foil and braid. A shield bonded at one end only, or bonded to a noisy ground, can perform worse than unshielded Cat 6a. Bonding at the panel and at the outlet is part of the specification.
Cost Per Port and the Comparison Table
Price gaps come from four places: cable, outlet, patch cords and the labor to terminate a shielded connector without damaging the foil. Cat 6a reuses RJ45 tooling and test adapters most contractors own, while Cat 7 pulls in new jacks, cords and often a new tester head.
| Attribute | Cat 6a | Cat 7 | What it means on site |
|---|
| Rated frequency | 500 MHz | 600 MHz | Margin for crosstalk, not more speed |
| Connector | RJ45 | GG45 or TERA | Cat 7 needs adapters at RJ45 gear |
| Shield | Optional, often F/UTP | Shielded, pair screened | Bonding and grounding required |
| Typical role | 10GBASE-T to 100 m | 10GBASE-T, dense shielded routes | Same link speed in both cases |
Read that table as a budget, not a ranking. The gap per port is driven by termination labor and adapter inventory far more than by copper. A tested and documented Cat 6a port usually outperforms a Cat 7 port installed without a field tester and a bonding check.
Practical scenarios
- Office fit-out: horizontal runs under 60 m to desks and wireless access points are well served by Cat 6a, and RJ45 patch panels keep moves adds and changes simple for the facility team.
- Industrial cabinet: drives and variable frequency drives next to data cable justify shielded Cat 7 with proper bonding, because coupling between cables rather than bandwidth is the real constraint.
- Retrofit: a building full of RJ45 outlets and Cat 6a patch cords gains little from Cat 7 unless the outlets are replaced in the same project budget.
- Floor-to-floor backbone: if the path exceeds 100 m, neither cable solves it. Fiber is the correct answer and copper should stop at the telecom room.
FAQ
Is Cat 7 faster than Cat 6a?
No. Both support 10GBASE-T to 100 m. Cat 7 has a higher rated frequency, which adds margin in noisy or tightly bundled routes, but it does not raise link speed.
Can I plug a Cat 7 cable into an RJ45 port?
Only with an adapter or a hybrid cord. GG45 sockets take RJ45 plugs in a compatibility mode, while TERA needs a dedicated adapter at every RJ45 device.
Does shielded cable need special grounding?
Yes. The shield must be bonded at the panel and at the outlet, and the building ground has to be sound. Without that, the shield can carry noise into the pairs it was meant to protect.
Next step
Before you lock a bill of materials, check the frequency and construction details in our Cat 6a specification overview, then compare the connector rules in the Cat 7 standards guide. If you are still weighing the previous generation, the Cat 6 vs Cat 6a comparison shows where the 250 MHz ceiling starts to bite.
