A hybrid fiber-power cable puts optical fibers and DC conductors in one jacket. It is a useful starting point for a new FTTA route serving several radios. Separate fiber and DC cables suit upgrades that reuse serviceable power feeds, need different routes, or require each cable to be replaceable on its own.
The choice changes cable handling, tower space, upgrade options and repair work. Compare the complete installed route, including breakouts, jumpers and support hardware, alongside the cable price.
Hybrid vs separate FTTA cables: how the layouts differ
A hybrid trunk carries fiber and power together along the main route. Near the radios, a breakout box or direct breakout separates them into optical and DC connections. With separate cables, the fiber and power feeds have their own jackets and can terminate at different points.
Modular is a connection architecture. It can use either hybrid trunks or separate fiber and power trunks, as shown in CommScope's HELIAX FTTA overview (page 1). Specify the cable construction and the breakout interface as two distinct choices.
Figure 1. A hybrid trunk with a breakout box below the radios. The box position sets the jumper lengths to the radios.
Figure 2. Separate fiber and DC cables can branch at different points. The two cables may use the same tower route.
Hybrid fiber-power vs separate cables: the practical trade-offs
| Decision | Hybrid fiber-power cable | Separate fiber and DC cables |
|---|---|---|
| Best fit | A new route with several radios and a defined fiber and power plan. | A retrofit using serviceable DC feeds, or a site with different fiber and power routes. |
| Installation | One combined trunk to handle; breakout, tails and radio jumpers are part of the installation. | Fiber and DC cables are handled separately, with their own terminations and supports. |
| Route space and tower load | Check trunk diameter, mass per meter, bend space and the complete support arrangement. | Check the combined footprint and mass of all fiber and DC runs, including their supports. |
| Existing DC feeds | A new combined trunk may duplicate usable power cabling; include removal or retention in the quote. | Fiber can be added while retaining DC feeds that meet the new radio load and voltage requirements. |
| Breakout position | A box-based layout groups branches at one planned point. Direct-breakout assemblies use factory tails. | Fiber and power can branch at different points, with jumper lengths matched to each route. |
| Future radios | New jumpers use available trunk capacity. Extra fibers, conductors or power capacity need an added feed or a new trunk. | Fiber and DC capacity can be expanded separately, subject to route space and support capacity. |
| Faults and replacement | Shared-jacket damage can affect both services. Replacement scope depends on the damaged section and assembly design. | The affected cable can be replaced separately. Damage along a shared route can still affect both cables. |
| Cost to compare | Trunk, breakout or tails, jumpers, support hardware, installation work and replacement stock. | Fiber cable, DC feeds, terminations, support hardware and installation work, less any usable cabling retained. |
A radio needs both a working optical link and DC power. Separate cables allow individual replacement; they provide no service redundancy by themselves.
Which layout fits your FTTA site?
Figure 3. Starting points for the layout comparison: a new route, reusable DC feeds and different fiber and power routes.
New site with several radios
Start with a hybrid option when the radio count, main route and breakout position are known. Size the trunk for the planned fiber pairs and power demand, then check the space and handling requirements at the tower. A combined trunk reduces the number of main cable runs; its diameter and weight still need to fit the route.
Retrofit with usable DC feeds
Start with separate fiber when the existing DC cables meet the new radios' voltage, load and termination requirements. Reusing them avoids buying and installing replacement power conductors. If those feeds also need replacement, compare quotes for both complete layouts, including removal work and support hardware.
Expansion or higher-power radios
Check three capacities separately: spare fibers, available DC circuits and the electrical capacity of the conductors and connectors. Replacing a jumper or adding a breakout port works within those limits. Once the trunk lacks capacity, add a suitable feed or replace the trunk. With separate cables, the constrained fiber or power run can be upgraded independently.
Figure 4. Check fiber, DC circuit and electrical capacity before adding radios. Extra breakout ports do not increase trunk capacity.
Limited access for future repairs
Compare the unit that would be replaced after damage: a radio jumper, a separate cable, or a complete trunk assembly. Stock spares by interface, length and capacity. Two cables on the same exposed route remain vulnerable to a common physical event, even though they can be replaced separately.
Compare complete installation costs
ANDREW's 2025 FTTA solutions sheet positions discrete cables for design flexibility and lower initial cost, and trunk-to-breakout layouts for deployment speed and upgrades. Use these as options to price against the same radio schedule and route.
- Include the main cable, breakouts or tails, all radio jumpers and termination hardware.
- Compare the installed cable mass, route footprint, hangers, glands, grounding and hoisting arrangement.
- Include existing cable removal, installation work and the spare assemblies needed for repairs.
For a hybrid direct-breakout example, HELIAX installation bulletin 7689527, Rev. L identifies the assembly accessories on page 2 and hoisting requirements on page 4. Use the installation data for the quoted cable to build its hardware and labor allowance.
What to specify in an FTTA cable RFQ
Use the radio data sheets and site power design for electrical inputs. Record the following fields for both quotes so that the comparison covers the same installation.
| Item | Required project input |
|---|---|
| Cable and termination layout | Hybrid or separate cables; breakout box, direct tails or modular connections; termination points on the route drawing. |
| Radio interfaces | Radio models, port drawings, connector housing, keying and sealing arrangement at both ends. |
| Fiber capacity and mapping | Fiber category, working fibers per radio, spare fibers, port map and factory termination map. |
| Optical acceptance | UPC or APC, insertion loss and return loss limits, test wavelengths, end-face inspection and serial-numbered reports. |
| Radio power demand | Rated and minimum input voltage, operating and peak load per radio, and the planned expansion load. |
| DC cable selection | Supply and return route lengths, allowable voltage drop, conductor cross-section, current rating and the temperature and installation conditions used for sizing. |
| Protection and bonding | Surge protection locations, grounding and bonding details, conductor terminations and connection requirements. |
| Dimensions and support | Cable outside diameter, mass per meter, trunk and jumper lengths, breakout locations, hangers and hoisting provisions. |
| Mechanical limits | Installation and operating bend radii, cable and connector tensile limits, crush resistance and strain relief. |
| Environment and spares | Temperature range, UV exposure, jacket and armor, ingress rating and mating state, labels and replacement units to stock. |
On a pre-terminated trunk, the factory connector and tail arrangement sets the delivered termination map. Record any patching or modular reassignment separately. For end-face inspection, reference IEC 61300-3-35:2022 alongside the optical performance tests.
Glory's FTTA cable, closure and connector guide covers the individual optical components used to build that fiber path.
Glory fiber components for either layout
Glory's 5G FTTA Fiber Connection Solution covers cabinet patching, outdoor fiber feeders, splice protection and radio-side assemblies. In a hybrid layout, these optical components connect at the trunk's ends. In a separate-cable layout, the outdoor fiber feeder is also a standalone run.
| Optical assembly | Use in the fiber path | Published cable dimensions |
|---|---|---|
| FullAXS LC Fiber Patch Cable | Radio-side connection matched to the equipment port drawing. | 4.8 mm cable; minimum bend radius 20 mm during installation and operation. |
| ODC FullAXS LC Outdoor Patch Cord | Optical link between the specified ODC and FullAXS interfaces. | 5.0 mm armored cable; minimum bend radius 40 mm during installation and 20 mm in operation. |
These dimensions apply to the linked product configurations. Match the housing, keying, cable entry and sealing arrangement to the actual ports.
Frequently asked questions
Is modular FTTA the same as hybrid cable?
Modular FTTA uses plug-and-play breakout connections. It can use a hybrid trunk or separate fiber and power trunks. Hybrid describes what shares the cable jacket.
Can more radios be added by changing jumpers?
Yes, when spare fibers, DC circuits and electrical capacity are available. More breakout ports alone cannot increase the capacity of the trunk.
Can existing DC cables be reused?
They can be retained when conductor size, condition, route length and terminations meet the new radio's load and voltage requirements.
Does replacing one separate cable interrupt the radio?
The radio requires both fiber connectivity and DC power. Work that interrupts either feed stops that radio unless the site has a separate redundancy arrangement.
Does IP67 apply when the connector is unmated?
Glory's ODC-FullAXS product specifies IP67 for the mated connector pair. Its unmated connectors require dust caps. Include the required mating state in the RFQ.
Request an FTTA fiber BOM
Send the radio models, port drawings, sector counts, route sketch and optical acceptance requirements. Glory can prepare a fiber BOM covering patching, feeder cable, protection and radio-side assemblies for the selected layout.
Sources and references
- CommScope, HELIAX FTTA family of solutions, CO-117505-EN (03-23), page 1: discrete, modular and trunk-to-breakout layouts.
- ANDREW / Amphenol, FTTA solutions, CO-200016-EN (01/25): discrete and trunk-to-breakout positioning.
- CommScope, HELIAX Hybrid Direct Fiber installation guidelines, bulletin 7689527, Rev. L, pages 2 and 4: direct-breakout accessories and hoisting.
- IEC, IEC 61300-3-35:2022: visual inspection of fiber optic connector end faces.
