Configuring iMac Thunderbolt 4 ports for USB, Cat5, and FireWire cables

Depending on what you’re working with here, it may be more effective to replace some or all of what you’re thinking of migrating with newer gear.

Apple sells USB-C to USB-A adapters. There are other options.

Continuing with FireWire gear is likely a non-starter. Apple discontinued FireWire ports circa 2012. What adapters are available (used) are limited, and Not Cheap.

iMac 24” optionally includes Gigabit Ethernet available on the power brick on the lower-end configurations, and includes Gigabit Ethernet with the higher-end configurations. You will want Cat 6 or Cat 6A. Cat 5 isn’t rated for Gigabit Ethernet.

A FireWire hard disk drive is outdated.

You’ll want to migrate that data, as you may well spend more than the cost of a new hard disk in adapters to use it.

To a new hard disk, or to a big USB-C flash drive for that matter.

Hard disks from that long ago are usually tiny, slow (even for a hard disk), and closer to the inevitable demise.

There are Thunderbolt Ethernet adapters for Gigabit Ethernet (GbE), for the newer 2.5 GbE, and yet faster, yes. This if you didn’t buy an iMac 24” with the built-in Ethernet port.

Gigabit Ethernet will probably serve you well, at least for now.

Older networking routers and older switches can pre-date GbE support.

As an alternative to dealing with Ethernet cabling, Wi-Fi is pretty speedy these days, too.

wdmn wrote:

Haven’t bought it yet, but will get a 24”.

There are different models of 24”, some with Wi-Fi wireless networking, and the mid- and upper-end models with both Wi-Fi wireless and Ethernet wired networking.

Based solely on how long you’ve kept that previous FireWire (Mac?), I’d look for an iMac 24” model with 16 GB memory, and with more internal storage than you think you need. This more for longevity.

Just learning that the CAT cable isn’t an issue anymore, as I can get a new, wireless router. It’s been a while, didn’t realize coax connectors are obsolete.

Cat (“Category”) 5, Cat 5E, Cat 6, and Cat 6A cabling are twisted pair cabling using Bell System modular jack RJ45 (eight position, eight contact “8P8C”) crimped connectors. Coax is older, with 10BASE2 ThinWire coax (and BNC T connectors) and 10BASE5 “ThickWire” Coaxial (and vampire taps) Ethernet gear largely disappearing by Y2K. Well, disappearing outside of museums, collectors, and a few rare commercial systems or legacy systems.

While most networks are Wi-Fi in recent years and wired or optical Ethernet is less common, wired networking has some advantages over Wi-Fi, particularly where the gear involved has Ethernet RJ45 connectors.

Backhaul for middling and larger home networks and business networks — including Wi-Fi networks with multiple access points (APs) for better coverage — is either mesh (wireless), or (preferably) wired or optical.

If you have an existing Cat 5 cable run for an older (presumably) Mac, I’d replace that cable run with Cat 6 or 6A cable if easily feasible, and would then continue to use wired, and would add Wi-Fi networking.

I do still work with some coax communications wiring, but that’s for broadcast DTV and radio frequency gear and related antennae, and not for computer networking.

wdmn wrote:

I’d have to call Verizon to see if a 6 or 6a cable would be compatible with my existing wired router.

Post your router vendor and model.

If it is, how do I connect it to a Thunderbolt 4 port on the new iMac? Are there adapters?

Unclear why you’re even asking that question, if you’re ordering an iMac with the available Gigabit Ethernet port.

To add a bit to MrHoffman's reply:

• As mentioned, CAT 5 does not support Gigabit Ethernet, but CAT 5e can support Gigabit Ethernet up to 100m.
• CAT 6: Supports Gigabit Ethernet up to 100 meters but can also handle 10 Gigabit Ethernet (10GBASE-T) at distances up to 55 meters.
• CAT 6a (augmented): Designed for 10 Gigabit Ethernet up to 100 meters, with better shielding and reduced interference.

All in all, I would suggest that you consider using CAT 6a cabling for "future prooffing". At least until having the need to use CAT 7 or CAT 8 cabling. ;)