An explansion board you insert into your computer so the computer can be connected to a network
C2G 0.45m USB to DB9 Serial Adapter Cable

C2G 0.45m USB to DB9 Serial Adapter Cable

C2G
£17.99
C2G USB 1284 DB25 Parallel Printer Adapter interface cards/adapter

C2G USB 1284 DB25 Parallel Printer Adapter interface cards/adapter

C2G
£25.99
C2G USB-C to Ethernet Network Adapter

C2G USB-C to Ethernet Network Adapter

C2G
£43.99
C2G USB 2.0 USB-C To DB9 Serial RS232 Adapter Cable

C2G USB 2.0 USB-C To DB9 Serial RS232 Adapter Cable

C2G
£35.99
C2G 86887 interface cards/adapter

C2G 86887 interface cards/adapter

C2G
£21.99
HP Thunderbolt 3.0 Flex IO v3 interface cards/adapter Internal

HP Thunderbolt 3.0 Flex IO v3 interface cards/adapter Internal

HP
£75.99
StarTech.com PEXUSB3S22 interface cards/adapter Internal USB 3.2 Gen 1 (3.1 Gen 1)

StarTech.com PEXUSB3S22 interface cards/adapter Internal USB 3.2 Gen 1 (3.1 Gen 1)

StarTech.com
£30.99
Perle IOLAN DS1 interface cards/adapter

Perle IOLAN DS1 interface cards/adapter

Perle
£417.99
Perle IOLAN DS1 interface cards/adapter

Perle IOLAN DS1 interface cards/adapter

Perle
£417.99
StarTech.com 4-Port USB-A PCIe Card, USB 3.2 10Gbps, PCI Express 3.0 Expansion Card, 4x Independent USB Controllers, Windows/Linux/macOS, TAA-Compliant

StarTech.com 4-Port USB-A PCIe Card, USB 3.2 10Gbps, PCI Express 3.0 Expansion Card, 4x Independent USB Controllers, Windows/Linux/macOS, TAA-Compliant

StarTech.com
£233.99
Cisco C9300X-NM-8Y-M-O interface cards/adapter Internal SFP+

Cisco C9300X-NM-8Y-M-O interface cards/adapter Internal SFP+

Cisco
£1,946.99
QNAP QXP-830S-3808 interface cards/adapter Internal Mini-SAS, SFF-8644

QNAP QXP-830S-3808 interface cards/adapter Internal Mini-SAS, SFF-8644

QNAP
£422.99