Fiber Backbone Infrastructure
That Goes the Distance

The choice between single-mode and multimode fiber depends on the distance of each link and the budget available for transceivers:

• OM3 multimode: Use for links up to 300 meters at 10GbE or up to 100 meters at 40GbE. Lowest cost transceivers (850nm VCSEL). Best for intra-building and short campus links in smaller deployments
• OM4 multimode: Use for links up to 400 meters at 10GbE or 150 meters at 40GbE. Slightly higher cable cost than OM3 but recommended for all new installations to maximize headroom for future speed upgrades. Best for data center intra-DC and medium campus runs
• OS2 single-mode: Use for any link exceeding 400 meters, or whenever future-proofing for very high speeds is a priority. OS2 supports 10GbE to 10 km and 100GbE to 2 km on the same fiber. Transceiver cost is higher than multimode but cable cost per meter is comparable. Mandatory for inter-building campus runs, city fiber networks, and inter-site data center links

When in doubt, AE Connect recommends OM4 for indoor intra-building projects and OS2 for all outdoor and inter-building runs. Our team can help specify the right fiber for each link in your project based on measured route distances.

Direct burial fiber cable requires specific construction features to survive in-ground installation without conduit protection. The key requirements are:

• Steel wire armour (SWA): A layer of galvanized steel wires around the cable provides crush resistance against rocks in the trench, protection from digging equipment during future excavation near the route, and rodent bite resistance
• Gel-filled moisture blocking: Flooding gel between the cable's loose tube elements and inner jacket prevents water ingress along the cable length if the outer jacket is punctured or at connector entry points
• UV-resistant outer jacket: HDPE or PE outer jacket rated for UV exposure at any above-ground sections of the route, such as entry and exit points from underground conduit
• Temperature rating: Outdoor burial cables must be rated for the full temperature range of the installation region - typically -20 to +70 degrees C for Indian climate conditions

AE Connect armoured outdoor fiber cables are available in OS2 single-mode and OM3/OM4 multimode, in 6 to 48-core configurations, with all the above features for direct burial installation without additional conduit. For particularly aggressive soil conditions or high-risk routes, double-armoured variants are also available.

Pre-terminated fiber assemblies offer significant advantages over field termination in most project scenarios:

• Quality consistency: Factory polished connectors achieve insertion loss of 0.1 to 0.3 dB per connector - field connectors from even skilled technicians typically average 0.3 to 0.5 dB with more variation between connectors on the same link
• Installation speed: Pulling and plugging a pre-terminated trunk takes minutes per run. Field termination of the same link takes 20 to 60 minutes per connector depending on method and technician skill
• No specialized tools on site: Field termination requires fusion splicer, cleaver, OTDR, insertion loss meter, and connector supplies. Pre-terminated assemblies require none of this equipment on site
• Tested and certified: Each assembly is insertion-loss tested at the factory and shipped with a test report. Field installations have no test records unless separately tested after completion
• Predictable project scheduling: Pre-terminated assemblies have fixed factory lead times and installation rates. Field termination speed varies with technician availability and skill level

Pre-terminated assemblies are ideal for structured runs of known length - data center inter-rack connections, campus riser links, and any backbone segment where the route length can be measured before cable manufacture. AE Connect pre-terminated trunks are available in custom lengths from 1 meter to 300 meters.

A fiber media converter is a device that converts standard copper Ethernet signals (RJ45) to optical fiber signals (LC or SC fiber connector) at one end of a link, allowing a copper-only switch to connect to a fiber backbone run. At the other end of the fiber link, a second media converter converts back from fiber to copper for the next switch or device. Media converters are used when:

• A network switch does not have SFP fiber ports, and replacing it is not justified by the project budget
• A link must exceed 100 meters but the switch on one or both ends is copper-only
• Adding fiber uplink capability to an existing access switch in a building that is being connected to a new campus fiber backbone without replacing all access hardware
• Connecting fiber between two locations that are in different electrical ground potential zones - fiber provides galvanic isolation that prevents ground loop interference between buildings

AE Connect WDM BiDi media converters are particularly useful for projects with limited fiber strand availability in conduit - a BiDi pair runs a full duplex gigabit link over a single fiber strand using different wavelengths for transmit and receive, halving the fiber strand consumption of any link where BiDi converters are used.

Fiber core count planning should account for current active links, future expansion, and spare capacity for maintenance. The standard planning approach is:

• Active links: Each active fiber link requires 2 cores - one for transmit and one for receive. An aggregation point with 10 uplinks and downlinks requires 20 cores minimum for current traffic
• Future expansion: Plan for 50 to 100% more cores than currently required. If you need 20 active cores today, specify 36 to 48-core cable. Adding fiber cores after installation requires trenching and new cable pulls - far more expensive than installing larger core count cable during initial construction
• Maintenance spares: Reserve at least 10 to 20% of total cores as dedicated spare capacity for replacing damaged or degraded fibers without affecting live traffic during maintenance operations
• WDM upgrade path: If planning for future wavelength-division multiplexing to multiply bandwidth on existing fiber strands, single-mode OS2 fiber enables this - multimode does not support WDM

For most enterprise campus backbone projects, 12-core cable is adequate for single-building risers, 24-core for inter-building distribution runs, and 48-core for main campus backbone segments. AE Connect can help calculate exact core counts for your specific project topology.

Yes. AE Connect provides complete end-to-end fiber backbone infrastructure supply for projects of any scale, from single-building riser cabling to multi-kilometer city fiber networks. Our supply scope covers OS2 single-mode fiber cables in indoor, outdoor, and armoured variants for all environments and distances, OM3 and OM4 multimode fiber cables for intra-building and data center applications, steel wire armoured outdoor fiber for direct burial and aerial installation, pre-terminated fiber trunk assemblies in custom lengths and connector configurations, fiber distribution frames in wall-mount and rack-mount configurations from 12 to 96 ports, high-density 1U and 2U rack-mount fiber patch panels, OM3/OM4 and OS2 fiber patch cords in all standard connector types and lengths, WDM BiDi and standard fiber media converters for copper-to-fiber integration, and passive fiber accessories including splice closures, cable management trays, and connector adapter plates. For large EPC and infrastructure projects we provide fiber type selection by link, route-level core count planning, BoQ preparation, ISO documentation for tender compliance, phased delivery scheduling against construction milestones, and volume pricing for registered system integrators and EPC contractors. Contact our fiber team with your project scope and route layout to receive a complete product recommendation and project quotation.