Quick Answer / Summary: A complete custom cable RFQ states the drawing or dimensions, quantities and lengths, connector and cable specification, test scope, labeling and packaging, delivery location and date, commercial terms, and the approval process. Send all eight and ask the supplier to quote against them explicitly.
Most slow or inaccurate custom cable quotes are caused by the request, not the supplier. An RFQ that lists a cable type and a quantity will produce a price for an assumption. An RFQ that lists the eight requirements below will produce a price you can place an order against.
Eight requirements turn a price into an order.Technical Requirements
The technical section defines the product. It should be specific enough that two suppliers would build the same thing.
Drawing or dimensions
Provide a drawing where one exists, or a dimensioned sketch with length tolerance. Include breakout positions, bend constraints and the connector at each end. A photograph is not a specification.
Cable and connector specification
Name the cable construction, gauge or fiber type, shield, jacket and connector part where known. Where you do not know, state the environment and the performance target so the supplier can propose, and mark those proposals as assumptions to approve.
Quantities and Commercial Terms
Quantities drive tooling amortisation and price breaks. Terms decide how the price becomes an order.
Quantities and lengths
Give the quantity per length, not just a total. Add a spare allowance and state whether the order may be split into releases. Suppliers price differently for one release and for scheduled call-offs.
Incoterms, payment and validity
State the delivery location and the Incoterm, the payment structure and how long the quote must remain valid. Copper and fiber prices move, so a quote without a validity period is not a commitment.
Quality and Documentation
Quality requirements are the most commonly omitted section and the one that explains most price differences.
Test scope and reports
State the tests required, the acceptance criteria and the report format. If you need per-leg insertion loss or a category-level channel test, say so in the RFQ, because a supplier quoting continuity only will look cheaper.
First article and approval
State that a first article is required and who approves it. Add whether the approval sample must be sealed and retained. This one paragraph prevents most batch-level surprises.
Labeling, Packaging and Delivery
These items are cheap to specify and expensive to fix after production.
Labeling
Provide the label text format, placement and material. If labels must survive cleaning or UV, say so, because a standard paper label will not.
Packaging and delivery
State the coil diameter, bag or carton, and whether deliveries must be sequenced by rack, floor or phase. Add the required-on-site date, not just a lead time, so the supplier can work backwards.
Custom Cable RFQ Checklist
| Section | Required content | Effect if omitted |
|---|
| Drawing | Dimensions, tolerance, breakouts | Wrong lengths and fit |
| Specification | Cable, connector, environment | Supplier assumes a cheaper part |
| Quantities | Per length, spares, releases | Price breaks and tooling wrong |
| Test scope | Tests, criteria, report format | Uncomparable quotes |
| Labeling | Text, placement, material | Rework at the factory |
| Packaging | Coil, carton, sequencing | Damage and picking errors |
| Delivery | Location, Incoterm, date | Schedule misalignment |
| Terms | Payment, validity, approval | Quote expires or changes |
Practical Applications
A structured RFQ is used for data center bundles, industrial harnesses, fiber trunk assemblies and any build-to-print cable. It is also the document that makes a later cost review possible, because each line can be compared with the order. Add one line to the RFQ that asks the supplier to list any assumption they made in order to quote. Assumptions are where price and product diverge, and a supplier who states them is easier to trust than one who does not. Reviewing three or four stated assumptions often changes the specification before the order is placed, which is exactly the point at which changes are still free. Keep a copy of the RFQ and the supplier’s stated assumptions with the purchase order. When a delivery arrives and something differs from expectation, the assumptions explain why faster than any meeting. This is also the document that makes a repeat order quick, because the same assumptions can be confirmed rather than rediscovered. Ask the supplier to quote two test scopes, one basic and one full, and show both prices. The difference is the real cost of evidence, and seeing it as a number makes the decision about risk explicit rather than implicit.
Reviewed by ZONG Cable Editorial | Last updated: 3 November 2026 | Reviewed against TIA-568 structured cabling practice and ISO/IEC 11801 fiber channel requirements.
How this guide was built: The checklist follows build-to-print procurement practice: technical definition, quantity structure, quality and documentation, logistics and commercial terms. Each section maps to a known cause of quote error or dispute.
Disclosure: We do not quote cable assemblies. Send the checklist to your suppliers and compare responses line by line.
Frequently Asked Questions
What should I include in a custom cable RFQ?
Drawing, specification, quantities per length, test scope, labeling, packaging, delivery terms and the approval process.
Why do quotes take so long?
Usually because the RFQ is missing dimensions or test requirements, so the supplier has to ask or assume. A complete RFQ shortens the cycle.
Should I ask for a sample with the quote?
Ask for a sample after the drawing is agreed. A sample before the drawing is agreed tests the wrong design.
How long should a quote be valid?
Long enough to cover your approval cycle. Copper and fiber pricing moves, so a quote without validity is an estimate.
What is the most common omission?
Test scope. It is the main reason two quotes for the same drawing differ by a wide margin.
