Map the site before choosing cable types

Utility and transport networks may place radio equipment on poles, towers, cabinets or remote structures. Start the remote site cable RFQ with a single-line diagram showing the network handoff, cabinet equipment, radio, antenna and power source. Identify what is already installed, what is being supplied by another party and what belongs in the cable package.

For each cable, define End A, End B, equipment make and model, port designation and connector interface. Attach equipment drawings where a port is recessed or uses a proprietary seal. A photograph can help identify access constraints, but it should supplement the technical interface definition rather than replace it.

This functional separation prevents a common quoting problem: a generic request for a telecom cable set with no defined equipment boundaries. It also helps distinguish optical backhaul, fronthaul and local patching when more than one optical connection exists at the site.

Specify the outdoor fiber jumper as an assembly

An outdoor fiber jumper is more than an indoor patch cord with a different jacket. Define the fiber category and count, connector at each end, polish, pinning where relevant, required length and tolerance, and any breakout dimensions. Confirm the optical interface with the equipment documentation instead of selecting a connector by appearance.

• State the exposed route, cabinet entries and any transition between outdoor and indoor spaces. Identify UV, water, temperature and required fire-performance conditions.
• Specify the cable diameter range accepted by each gland and whether a connector must pass through a pre-existing opening.
• Record the optical performance required for the assembly and how it fits within the overall link budget. Define test wavelengths and report expectations.
• List pulling protection, bend management, strain relief, labels and spare fibers where required by the design.

An enclosure rating applies under defined assembly conditions. Ask how the connector, seal, cable and equipment receptacle form the intended protected interface, including the mated or capped state. A cable jacket description alone cannot establish the protection of the completed connection.

Review fiber patching and passive optical components alongside the route drawing. The cable, adapters, patch panel and closure may all affect the final connection. Keep service loops intentional and use the specified installation and operating bend limits rather than adding an arbitrary coil at each end.

Define the RF jumper by frequency and interfaces

An RF jumper cable request should identify the operating frequency range, system impedance, connector series and interface at both ends, assembly length and any right-angle orientation. Ask for attenuation across the required band and the agreed return-loss or VSWR performance, using the complete assembly as the defined test scope.

Where passive intermodulation performance is required by the radio design, specify the test tones, power, method and acceptance limit. A low-PIM description without test conditions does not create a comparable RFQ. Check whether adapters or surge-protection devices are part of the supply because they introduce additional interfaces and may affect performance.

Do not assume that a connector which appears to fit is the intended mating part. Confirm the interface designation and equipment requirements. Keep connector access and tool clearance visible in the drawing so an acceptable laboratory assembly can also be installed and maintained at the site.

For further background on cable-to-connector compatibility, weather protection and RF assembly performance, see CommScope’s guide to optimizing the RF path. Apply the requirements of the selected equipment and project when preparing the final RFQ.

Size the DC cable from the complete circuit

For a DC power cable, provide the source-voltage range, allowable input range at the load, normal and maximum demand, startup behavior and one-way route length. State the conductor arrangement, termination method and grounding or bonding scheme. The cable selection must address both voltage drop and current-carrying requirements under the actual installation conditions.

For a simple two-conductor DC circuit, voltage drop equals current multiplied by total loop resistance: ΔV = I × R_loop. The loop includes both outgoing and return conductors, plus relevant connection resistance. Use resistance at the intended operating conditions. CommScope’s discussion of remote-radio voltage drop explains why this becomes important as power is delivered over longer cable runs.

As an arithmetic example only, a 10 A load and a total loop resistance of 0.20 Ω produce a 2 V drop. If the minimum source voltage magnitude is 48 V, the calculated load-side magnitude is 46 V before any other uncounted losses. These assumed values are not a cable recommendation. Compare the result with the actual equipment input range, and consider the worst operating condition; a constant-power load may draw more current as its input voltage falls.

Voltage drop alone does not establish a suitable conductor size. The design also needs to consider ambient temperature, grouping, installation method, terminal ratings and protective-device coordination under the applicable project requirements. Supply this information to the responsible electrical designer and cable supplier. Identify polarity and terminal details explicitly, especially when equipment conventions differ.

Describe route conditions and accessory boundaries

A remote installation can be delayed by a missing gland or bracket even when every cable has arrived. Include a route drawing that shows the actual path, vertical rises, penetrations, bend locations and service access. State exposure to sunlight, moisture, salt, vibration or other relevant conditions without substituting a generic outdoor label for the site description.

• Measure the installed route and define how service loops and termination allowances are included in the ordered length.
• Identify support spacing and attachment requirements from the selected cable and installation design; do not use connectors as load-bearing supports.
• Assign responsibility for glands, seals, strain relief, brackets, grounding kits, surge devices and consumables.
• State site-specific separation, bonding and protection requirements in the drawing and installation scope.
• Specify storage, transport and labeling needs for remote access locations and staged installation crews.

For a mixed cable package, list the acceptance evidence by cable type. Fiber may require optical loss and end-face records; RF may require band-specific electrical results; DC assemblies may require continuity, polarity and other tests specified by the design. Agree methods and limits rather than applying one generic certificate to the entire kit.

Issue a site-by-site RFQ matrix

Use one line per assembly and keep the site identifier separate from the part number. This allows suppliers to quote repeated assemblies efficiently while preserving the delivery information needed by installers. Mark unresolved measurements or equipment selections as open items and assign a decision date before production release.

Ask suppliers to return a compliance response, an itemized quotation and a single deviation list. Identify which lead times depend on custom connectors, drawings or final route lengths. Review alternatives across the whole interface: a different cable diameter can affect a gland, while a different connector body can affect access in a crowded cabinet.

Before approving the package, reconcile the fiber, RF and power schedules with the same equipment revision. A complete remote site cable RFQ gives the procurement team comparable offers and gives the installation team a package with clear interfaces, evidence and ownership.

Frequently asked questions