We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green printed circuit board with gold edge connector and one RJ-45 port

3Com

3Com 3C509B-TP Etherlink III ISA 10BASE-T Network Card

SKU CH-PVA3-2GDJ3

An ISA Ethernet card with one RJ-45 port for 10BASE-T networking on 16-bit PCs

  • ISA host interface fits 16-bit slots
  • single RJ-45 port connects 10BASE-T networks
  • plug-in card form factor installs directly
  • two total ports provide flexibility
  • 3Com Etherlink III design ensures broad OS compatibility

Etherlink III ISA 10BASE-T Card

The 3Com 3C509B-TP Etherlink III is a 16-bit ISA network interface card that adds a single 10BASE-T Ethernet connection to an IBM-compatible PC. It is built for legacy systems that still rely on the ISA bus and need basic wired networking.

ISA Bus And 10 Mbps Throughput

The card plugs into a 16-bit ISA slot and operates at 10 Mbps over twisted-pair cabling using an RJ-45 port. Bandwidth is limited to the 10BASE-T standard and the throughput of the ISA bus itself, so it cannot serve modern high-speed networks.

Single RJ-45 Port For Twisted Pair

Only one RJ-45 jack is provided for 10BASE-T connectivity; there is no second network port for redundancy or segmentation. Buyers who need more than one wired link must add another card.

Highlights

  • ISA host interface fits 16-bit slots
  • single RJ-45 port connects 10BASE-T networks
  • plug-in card form factor installs directly
  • two total ports provide flexibility
  • 3Com Etherlink III design ensures broad OS compatibility

Specifications

BrandHPE

Questions about this item

Which Etherlink III ISA model should I pick for a 16-bit ISA slot?

The 3C509B-TP is the single 10BASE-T RJ-45 version built for 16-bit ISA IBM-compatible PCs.

What real throughput does the 10BASE-T rating deliver in a 16-bit ISA system?

10 Mbps maximum; the card's Parallel Tasking design keeps the ISA bus fed so you approach that ceiling under load.

How does the ISA host interface limit the 10BASE-T connection?

The 16-bit ISA bus caps sustained throughput at the 10 Mbps line rate, so the network link is never starved by the slot.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.