What Is a Ribbon Cable?
A ribbon cable is a cable where many thin conductors are arranged side by side in a flat band. It carries many signals in one orderly cable.
Its Structure
The conductors are arranged in parallel at an equal spacing (usually a 1.27 mm pitch). This regular pitch lets the cable be connected to IDC connectors in a single move.
IDC Connection
A ribbon cable is connected without soldering via an IDC (Insulation Displacement Connector): the connector's sharp tips pierce the insulation and grip the wire. With a single press all conductors are connected at once.
| Property | Value |
|---|---|
| Pitch | Usually 1.27 mm |
| Connection | IDC (bulk, solderless) |
| Wire 1 | Marked with a colored stripe |
The First-Wire Mark
The colored (usually red) stripe on one edge of the cable marks wire number 1. This mark is critical so the connector is inserted the right way and the pin order isn't confused.
Where Is It Used?
Old hard disk/floppy drive cables, header connections, JTAG/programming cables and on-board multi-line data buses.
Grounded Lines and Crosstalk
In high-speed ribbon cables, ground wires are interspersed between the signal wires (ground-signal-ground arrangement) to reduce crosstalk between lines. This reduces neighboring lines affecting each other and preserves signal integrity; it's especially important on long cables.
Common Mistakes
- Reverse insertion: if the wire-1 mark isn't heeded, all the pins shift.
- High speed: crosstalk increases on a long ribbon cable.
- Pitch match: the cable pitch must match the IDC connector.
Frequently Asked Questions
What does the red stripe mean?+
Why use IDC?+
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