USB B USB B: What a B-to-B Cable Is and What It Carries
A USB B to USB B cable – a B-to-B run with the squarish Type-B plug on both ends – is the less common sibling of the standard A-to-B printer cable, and it serves a different job: linking two devices with B ports, or connecting a B-port device in a chain or panel where neither end goes to a standard host A port. This guide covers what a B-to-B cable is, where you actually see one (print and scanning chains, kiosks, industrial and lab panels), what it carries over the link, and how it differs from the A-to-B cable most people reach for first.
Quick Answer / Technical Summary
A USB B to USB B cable has a USB Type-B plug on both ends, and it is used to link two B-port devices – for example, a scanner to a printer in a digitize-and-print chain, or a B-port device into an industrial or kiosk panel that presents a B socket. It carries the same USB 2.0 (480 Mbps) or USB 3.0 (5 Gbps) data and power as the matching A-to-B version, but neither end terminates in a standard host A port. It is a device-to-device interconnect, not the default computer-to-printer cable, which is A-to-B.
What a B-to-B Cable Connects
A B-to-B cable joins two USB-B endpoints – two B-port devices, or a B-port device and a panel or enclosure that presents a B socket. Neither end is the standard rectangular host A plug, so the cable is not the computer-to-printer link.
Its home is device-to-device connection, where both sides of the link speak USB-B.
Where You Actually See One
Typical homes are a scanner-to-printer digitize-and-print chain, a kiosk or vending enclosure that routes a B-port device through a panel, an industrial or lab setup where equipment is chained B-to-B, and certain multi-device stations. In each the two B ends match the two B sockets on the equipment.
If a setup has two B sockets to join, the B-to-B cable is the part.
Power and Data on a B-to-B Run
A B-to-B cable carries the same four-wire USB 2.0 data-and-power set (VCC, GND, D+, D-) as an A-to-B cable, or the nine-pin 3.0 set where both ends are 3.0 B. The link provides the data path and the 5 V the USB connection is specified around, just as the A-to-B does – only the two host-side A plugs are replaced by B plugs.
Version matching still applies: both ends must be the same USB generation to use the higher rate.
Choosing a B-to-B Cable
Confirm both sockets are USB-B (and the same generation), set the length to the real distance between the two devices, and choose shielding and build for the environment. Where the two B ports are close – a chain on one bench or a panel – a short B-to-B is the clean, direct link.
Specify the B-to-B the same way you would an A-to-B: version, length, shielding, build.
Technical Specifications & Performance Benchmarks
| Cable | End 1 | End 2 | Typical Use |
|---|---|---|---|
| A to B | Rectangular A (host) | Square B (device) | Computer to printer / scanner |
| B to B | Square B | Square B | Device-to-device, kiosk / panel chains |
| A to A | Rectangular A | Rectangular A | Host to an A-female device |
| Version rule | Match generations | Both ends same gen | For the higher rate |
| Reach | Passive ~5 m (2.0) | Same passive limit | Shorter for device chains |
Industrial & Enterprise Application Scenarios
- Digitize-and-Print Chain: A scanner and a printer on one bench are linked through a short B-to-B run in a combined scan-and-print station.
- Kiosk Enclosure: A kiosk routes a B-port device through a panel B socket using a B-to-B cable, keeping the connection internal and serviceable.
- Industrial / Lab Panel: Equipment chained B-to-B on a control panel uses short, shielded B-to-B cables for the device-to-device data links.
- Multi-Device Station: A station with two B sockets joins them with a B-to-B cable rather than routing both out to separate host ports.
System Integration & Recommended Connectivity Infrastructure
To build a complete, single-cable workstation or equipment-cabinet connectivity stack, pair these USB cable and connector products with our certified data and power interconnect range:
- usb extension cable: Where a B-to-B chain needs a little more reach between the two B sockets, a usb extension cable on the host side of the panel adds it.
- adapter series: The adapter series covers the A-side and version conversions a B-to-B link meets when one endpoint is not a standard B socket.
- type c-hub: The host side of a B-to-B setup often feeds from a type c-hub that presents the USB-A port the panel’s A side connects to.
- ethernet cable: For device-to-device data across a room, an ethernet cable over the network is the longer-reach alternative to a B-to-B USB run.
Frequently Asked Questions (FAQ)
Q: What is a USB B to USB B cable?
A cable with a USB Type-B plug on both ends, used to link two B-port devices or connect a B-port device into a panel that presents a B socket – a device-to-device interconnect, not the standard computer-to-printer A-to-B cable.
Q: Where is a B-to-B cable used?
In scanner-to-printer chains, kiosk or vending enclosures that route a B-port device through a panel, industrial or lab setups that chain equipment B-to-B, and multi-device stations with two B sockets.
Q: Is a B-to-B cable the same as an A-to-B cable?
No – an A-to-B has a rectangular host A plug on one end and a B plug on the other, for a computer-to-device link. A B-to-B has B plugs on both ends, for a device-to-device link. They carry the same USB data and power but serve different connections.
Q: What version should a B-to-B cable be?
Match the two B sockets – both USB 2.0 or both USB 3.0. To use the higher 5 Gbps rate both ends must be 3.0 B; otherwise the link runs at 2.0.