DIRECT ANSWER / 01
Freeze route, length datums and installation sequence before ordering
A preterminated system is a cable or assembly terminated before installation. Ordering requires more than total length: datums, branches, pulling protection, pathway, labels and site acceptance matter. Factory termination does not exempt the installed link from testing.
Use this for inter-rack trunks, repeated equipment branches and pathway expansion. Corning’s preconnected-system guidance discusses route installation and pulling protection. The checklist below is a project-review aid, not a fixed promise of installation speed, pulling force or bend radius; obtain those values for the selected assembly.
SELECTION MATRIX / 02
Purchasing decision matrix
| Item | Identify | Correct action | Avoid |
|---|---|---|---|
| Length datum | Connector face, boot or breakout point | Show measurement endpoints and tolerances | Comparing quotes using different datums |
| Pathway | Tray, duct, cutout and cabinet entry | Check passage of the pulling end and maximum envelope | Checking only cable diameter |
| Breakouts | Length, direction, port numbering and slack | Draw branches against equipment ports and routing | Assuming equal branch lengths |
| Installation protection | Pulling configuration, limits and end-face protection | Follow assembly instructions and preserve labels | Applying pulling loads directly through connectors |
| Acceptance | Port map, labels, inspection and site testing | Record pre/post-installation state and reports | Replacing installed checks with a factory report |
RFQ INPUTS / 03
Minimum inputs a supplier can verify
| Category | Required input or confirmation |
|---|---|
| Route record | Measured path, entries, obstacles, direction and slack locations |
| Order drawing | Datums, tolerances, branch lengths, fibre, ends, mapping and labels |
| Installation and acceptance | Pulling protection, applicable instructions, test method, reports and approved revision |
BUYER FAQ / 04
Purchasing FAQ
Is total length the straight-line rack distance?
No. Use the actual route and agreed datums; define bends, cabinet entry, branches and maintenance slack.
How can branch lengths be specified clearly?
Show breakout-to-end datums, direction, tolerance and port ID, not just a number.
Is site testing needed after factory testing?
Review the installed link under the project plan. Pulling, mating, contamination and connection points can alter its final state.
Can all assemblies use the same duct?
No. Check the protected pulling-end envelope and pathway, not only the cable diameter.
How much maintenance slack is required?
There is no universal value in this guide. Approve it against racks, service space, bend limits and site rules.
SOURCES / 05
Sources and applicability
Sources checked: 2026-10-01. This guide clarifies purchasing fields; it does not replace current equipment data sheets, full standards or the approved project drawing.