# Fiber Splice Design Services **URL:** https://draftech.com/services/fiber-splice-design **Canonical:** https://draftech.com/services/fiber-splice-design **Updated:** 2026-10-07 **Description:** Draftech's fiber splice design services deliver splice matrices and fiber assignment records for existing networks, kept current by one in-house team. **Visible word count:** 1339 **Source:** derived from services/fiber-splice-design.html by projects/content-pipeline/src/sync_blog_ai_mirrors.py - do not hand-edit --- [Part of our Fiber Network Design services](https://draftech.com/services/fiber-network-design) FIBER ASSIGNMENTS THAT STAY CURRENT Last reviewed: October 2026 Draftech designs and maintains splice matrices, closure diagrams and fiber assignment records for existing networks. Your single point of accountability is the engineering team revising the matrix, diagrams and assignment sheets together each time the network changes. [Get Your First 20,000 LF Free](https://draftech.com/free-design) 44K+ Miles of OSP Designed 2.6M+ Addresses Passed 24 Active States 600+ Engineers Nationwide ## Splice engineering tied to the current network record Draftech International provides fiber splice design services for ISPs, carriers and electric cooperatives that need standalone splice engineering for existing plant. We deliver splice matrices, closure-by-closure diagrams, buffer-tube and fiber assignment sheets, and maintained splice record books. The scope can cover a capacity reassignment, a re-splicing program, lessee assignment changes or a legacy network with inconsistent documentation. A correct record can become wrong after its next undocumented change. A technician arrives with a sheet that no longer matches the closure. A splice added after the last revision has quietly used a fiber the record still shows as spare. The result can be a wasted truck roll, a cut in the wrong tube or a capacity decision built on fibers that are no longer available. Each later project that trusts that file inherits the error. Reconciling that gap months or years later becomes its own engineering project. Within our [fiber network design services](https://draftech.com/services/fiber-network-design), this engagement gives the splice record its own engineering scope and continuity. Draftech's engineering is 100% in-house. The team producing the design also maintains its documented revisions, giving the owner a single point of accountability for the assignment record. ## Splice design for the change your existing network needs ### Capacity reassignment and re-splicing programs A route can have enough total fiber count while the fibers a new connection needs are already assigned or spliced through to the wrong path. Draftech develops the revised assignment scheme against the current network record, the intended connections and available closure capacity. The design identifies which assignments change and which must remain intact. Our fiber splice planning services trace a reassigned fiber through every downstream closure it passes. A reassigned fiber can alter the capacity available to another planned addition. We carry that relationship into the record so separate projects do not plan around the same apparent spare. ### Multi-tenant and dark-fiber networks Owners need individual fiber assignments that remain traceable as lessee requirements change. Draftech maintains the owner's assignment sheets against the supplied carrier or lessee requirements, identifying allocated fibers and the capacity retained for other uses. Changes remain associated with the affected assignment and its revision history. That detail matters when an allocation changes on only part of an existing route. A broad cable-level label cannot show which individual fibers remain committed through each affected closure. Our deliverable preserves that distinction in the owner's engineering record. ### Legacy records with gaps or conflicting versions For a network assembled through successive projects, separate splice books may describe overlapping portions of the same plant differently. Draftech produces a single reconciled assignment record from the available sources, with each conflicting entry flagged. The splice matrix and assignment sheets show each fiber's status at each closure as committed, available or unresolved. A conflicting assignment is marked unresolved, not available for the next addition. Flagging those entries gives the owner specific fibers and closures to resolve before reassignment. ## What our fiber splice design services deliver We define the deliverables around the affected network and your team's documentation requirements. Records are delivered in the format the client's team works in, with consistent references between the matrix, diagrams and assignment sheets. - **Splice matrices:** Fiber-to-fiber connections at each closure in the agreed scope, by cable ID, buffer tube and fiber color, including express tubes and fibers that pass through uncut, with existing assignments and proposed revisions distinguishable. - **Closure-by-closure splice diagrams:** A closure-level view of the assignment design, tied to the corresponding matrix. Revisions carry through both views so a diagram and its matrix do not describe different versions of the same connection. - **Strand and fiber assignment sheets:** Assignments at the buffer-tube and individual fiber level, including the owner's allocation requirements. Our fiber splice sheet documentation services preserve the detail needed to distinguish committed, available and unresolved assignments. - **Capacity planning for additions:** Splice point planning checked against the proposed assignment scheme, showing the spare fibers and splice tray capacity left at each affected closure after the addition. - **Maintained splice record books:** The coordinated record set and documented change log carried forward as adds, moves and changes occur. ## How we set the design basis before assigning fibers We begin with the existing design or as-built record, available assignment sheets, closure information and the owner's requested changes. Carrier or lessee requirements belong in that intake because they can constrain which fibers are available for reassignment. We also set the boundaries of the engagement, including affected closures and fibers that express through the affected closures to points beyond them. Our engineers compare the source records for conflicting assignments, missing references and uncertain revision status. Where reliable records do not exist, the design depends on field-verified data. We then validate the assignment scheme against actual closure capacity and the supplied operating requirements. A proposed addition may fit the fiber count but exceed the closure's available capacity. Resolving those conditions before producing the revised record prevents the design from carrying an avoidable conflict forward. ## Internal QA across the complete record Draftech produces the record set under the same internal QA applied to our engineering deliverables. Review checks that the documents describe the same assignment scheme, use consistent cable and closure references, and reflect the confirmed closure capacity and allocation requirements. QA also checks that existing assignments and proposed changes are distinguished consistently across every document in the set. A planned reassignment is labeled proposed until supporting information confirms it is built. We resolve discrepancies within our deliverables and document remaining input gaps. Your team receives an engineering record whose revision status and limitations are visible, so the next decision does not depend on guessing which sheet governs. ## Assignment records maintained between projects Record maintenance needs an agreed flow of change information. At scoping, Draftech defines with the owner which network changes require an update, what supporting information accompanies them and how revisions are identified. As adds, moves and changes occur, we update the affected matrix entries, diagrams and assignment sheets together. With fiber splice matrix documentation services, each revision stays traceable to the fibers and closures it affects. The change log identifies the affected records and what changed. When construction changes the plant, the revised splice design becomes an input to [as-built documentation](https://draftech.com/services/as-built-documentation) once that work is in the ground. The maintained assignment record and its change log then carry forward to the next project. ## Fit splice engineering into the right service scope Standalone splice design starts with an existing network or a documented design. It can be commissioned independently of a [bundled new-build LLD engagement](https://draftech.com/services/lld-services), allowing the owner to address assignment changes without reopening the scope of an entire network design package. For work before a route is selected, [fiber route engineering](https://draftech.com/services/fiber-route-engineering) addresses pre-design routing and feasibility. When the need is an independent assessment of a design another firm produced, [fiber design review](https://draftech.com/services/fiber-design-review) is the appropriate engagement. Here, Draftech produces and maintains the splice design and assignment record itself. More in This Pillar - [Fiber Network Design](https://draftech.com/services/fiber-network-design) - [FTTH Design Engineering](https://draftech.com/services/ftth-design) - [HLD Engineering](https://draftech.com/services/hld-services) - [LLD Engineering](https://draftech.com/services/lld-services) - [MDU Fiber Engineering](https://draftech.com/services/mdu-fiber-engineering) - [Fiber Route Engineering](https://draftech.com/services/fiber-route-engineering) - [Fiber Design Review](https://draftech.com/services/fiber-design-review) Get Started ## Put your splice records under one accountable team Bring your available splice records to a discussion of the changes your network needs. Tell us where the records have gaps, which delivery format your team uses and whether the engagement should cover a defined assignment program or continued record maintenance. [Contact Draftech's engineering team](https://draftech.com/contact) to scope the design, documentation and updates your network needs. [info@draftech.com](mailto:info@draftech.com) | [305-306-7407](tel:3053067407) ## Frequently Asked Questions ### Can Draftech work on a network another company designed or built? Yes. The engagement can begin with the existing design or as-built records, regardless of who originally produced them. We establish the design basis and flag any gaps before the affected assignments are relied on. ### Can we hire Draftech for a single reassignment program? Yes. We can scope the design around an identified capacity reassignment or re-splicing program on an existing route. The engagement defines the affected records and whether ongoing maintenance continues after that work. ### What if our splice records have never been formally documented? We identify the available source information and the gaps that prevent a dependable assignment record. Share any existing design or as-built documents, partial splice books, assignment sheets and carrier or lessee requirements that can help us build the record. Draftech then produces the agreed splice design and record set from that basis. ### Does Draftech offer or arrange dark-fiber leases? No. Draftech maintains the network owner's fiber assignment records against the carrier or lessee requirements the owner supplies. We do not lease, sell, broker or market fiber. ### How do we submit fiber assignment changes for ongoing maintenance? Provide the affected cable and closure references, the fiber assignments that changed and the supporting revision information through the change flow agreed with our engineering team. If an update concerns a carrier or lessee allocation, provide the revised assignment requirements as well. Draftech incorporates those changes into the coordinated record set and its change log.