HFC & High Split Upgrade Engineering

Turnkey Engineering Solutions provides field engineering, plant mapping, and design documentation for HFC upgrades — including mid split and high split migrations supporting DOCSIS 3.1 and DOCSIS 4.0. We work at program scale for cable operators and the prime contractors executing their upgrade cycles, delivering construction-ready deliverables across the southeastern United States.

What a High Split Upgrade Actually Requires

North American HFC plant has historically run a sub-split architecture: roughly 5-42 MHz upstream, with downstream beginning at 54 MHz. That allocation was built for an era when subscribers consumed far more than they sent.

Upstream demand broke that assumption. Operators have been moving up the band split ladder ever since:

Moving to high split reclaims a substantial block of spectrum for upstream — but it is not a headend-only change. Everything in the path has to support the new split, and everything that doesn't has to be found, documented, and replaced. That is a field engineering problem before it is a construction problem, and it is where upgrade programs slip.

Where TESINC Fits

Upgrade programs fail on documentation, not on theory. Operators frequently discover that as-built records don't match the plant in the ground — and every discrepancy found during construction instead of during design is a truck roll, a change order, and a schedule day lost.

We do the work that prevents that:

• HFC plant mapping and verification — walking the plant and capturing what is actually there, not what the records claim
• High split and mid split upgrade documentation — identifying actives, passives, and plant elements requiring replacement to support the new split
• Node split design support — documentation for segmentation and node-split programs
• Fiber deep and DAA migration support — field data for architecture transitions
• As-built surveys — closing the loop so records match reality when the program ends
• Make ready and pole loading — where upgrades require plant changes in the aerial path

Deliverables come back in Katapult Pro, KMZ, or custom GIS formats, and our CAD team works in AutoCAD and MicroStation.

Program-Scale Capacity

HFC upgrade programs are measured in thousands of plant miles, not route segments. They require a bench that can be stood up quickly, hold a consistent data standard across many crews, and sustain throughput for months.

TESINC is actively engaged in high split mapping in the Southeast. We can staff a defined footprint or carry field engineering and documentation for an entire upgrade program, and we add crews as a program expands rather than becoming the constraint on it.

Why Operators and Primes Work With TESINC

• HFC depth, not just fiber. Most engineering firms market FTTH. We do both, and we work coax plant fluently.
• Field data you can build from. GPS-synced capture in the formats your team already uses.
• Documentation discipline. Consistent standards across crews, so a large multi-crew program reads like one dataset instead of twelve.
• Southeastern footprint. Florida, Georgia, the Carolinas, and Alabama — with DOT permitting expertise in each when upgrades touch right-of-way.

Where an upgrade changes the aerial path, the same field survey feeds our make ready engineering and pole loading analysis work.

Frequently Asked Questions

What is a high split?

A high split reallocates the coax band to 5 to 204 MHz upstream, with downstream beginning at 258 MHz. Legacy North American plant runs a sub-split at 5 to 42 MHz upstream with downstream beginning at 54 MHz, and a mid split runs 5 to 85 MHz with downstream beginning at 108 MHz.

Why does a high split upgrade need field engineering?

Moving to a high split is not a headend-only change. Everything in the signal path has to support the new split, and anything that does not has to be found, documented and replaced. Operators frequently discover that as-built records do not match the plant in the ground, and every discrepancy found during construction rather than during design is a truck roll, a change order and a schedule day lost.

What formats do HFC deliverables come back in?

Field data comes back in Katapult Pro, KMZ or custom GIS formats, and drafting is produced in AutoCAD or MicroStation.

Planning an upgrade? Our field-level reference on what a high split upgrade requires covers the band splits, what has to come out of the plant, the legacy out-of-band signalling conflict at 70–130 MHz, and why leakage monitoring inverts once upstream reaches the aeronautical band.