The cable's heavier build - 7.0–15.0 mm OD, 200 N long-term / 800 N short-term pull rating, and 45–198 kg/km weight - reflects its role as a backbone and riser cable, not a last-metre patch. It is designed to survive repeated pulls through conduits and cable trays during phased construction, and to carry its own weight over long vertical riser sections without creep damage to the fibers.
Where the GJFJV bundle cable delivers a single-jacket multi-fiber run, this distribution cable adds a second layer of organisation: fibers are pre-grouped into sub-units before they leave the factory. An 8-core version might ship with four 2-fiber sub-units, or two 4-fiber sub-units - each group identifiable by a distinct sub-unit jacket colour. The result is a cable that acts as its own distribution point, bringing order to complex branching topologies before a single connector is ever installed.
| Parameter | Specification |
|---|---|
| Model / Standard | GJFJV-S per YD/T 1258 & IEC 60794-2-10 |
| Fiber Type | OM1 / OM2 / OM3 / OM4 / OM5 multimode & G.652D single-mode |
| Core Count | 4 / 6 / 8 / 12 / 24 (custom configurations available) |
| Sub-unit Structure | Each sub-unit: 0.9 mm tight-buffered fibers in individual LSZH/PVC sub-jacket |
| Outer Diameter | 7.0 mm (4-core) - 15.0 mm (24-core) |
| Outer Jacket | PVC (standard) / LSZH (IEC 60332-1 flame retardant) |
| Sub-unit Jacket Color | Unique color per sub-unit for instant visual identification at branch points |
| Central Strength Member | Non-metallic FRP rod |
| Reinforcement | Aramid yarn (Kevlar®) - outer jacket + individual sub-unit reinforcement |
| Long-term Tensile Strength | 200 N |
| Short-term Tensile Strength | 800 N |
| Min. Bend Radius (long-term) | ≥ 15 × OD |
| Min. Bend Radius (short-term) | ≥ 10 × OD |
| Operating Temperature | −30°C to +80°C |
| Storage Temperature | −40°C to +80°C |
| Net Weight | 45 – 198 kg/km (varies by core count and OD) |
| Standard Reel Length | 500 m / 1,000 m / custom |
| Filling Material | None - direct termination of sub-unit fibers after peeling |
Riser & Long-conduit Pull Capability
Distribution cables are pulled through conduits that may run 30–80 m between access points. At 800 N, this cable handles the weight and friction of long horizontal pulls, or vertical riser segments of up to 50 m, without placing stress on individual fiber strands.
Tighter Radius Than Loose-tube Alternatives
The tight-buffered sub-unit construction yields a more flexible cable than gel-filled loose-tube designs of comparable OD, letting installers navigate 90° cable tray bends and access-panel corners without dedicated sweep fittings.
Vertical Riser Load Management
For a 24-core cable at 198 kg/km in a 30 m riser, the self-weight load is approximately 59 N - well within the 200 N long-term limit. Clamp every 2 m as per ANSI/TIA-568 recommendations to distribute load evenly and prevent cumulative creep.
Two-tier Mechanical Isolation
Unlike a simple bundle cable, each sub-unit carries its own aramid reinforcement inside its individual sub-jacket. This means a physical impact or sharp bend that damages one sub-unit does not propagate micro-stress to adjacent fiber groups - a critical advantage in high-traffic cable trays.
| Project Scenario | Recommended Config | Fiber Type | Sub-unit Layout | Reason |
|---|---|---|---|---|
| 4-room office floor, 1 link/room | 4-core (2×2) | OM4 or SM | 2 × 2-fiber SU | One sub-unit per side of floor; minimal waste |
| Open-plan office, 3–4 access points | 8-core (4×2) | OM4 | 4 × 2-fiber SU | One duplex sub-unit per cluster; supports 10G now, 25G later |
| School wing, multi-classroom | 12-core (3×4) | OM3 or OM4 | 3 × 4-fiber SU | Serves 3 classrooms, 2 fibers active + 2 spare per room |
| Hospital ward, AV + data + PACS | 12-core (6×2) | SM G.652D | 6 × 2-fiber SU | SM for PACS long-reach; granular branching per bed cluster |
| Large commercial floor, 8+ zones | 24-core (8×3) | OM4 or SM | 8 × 3-fiber SU | One sub-unit per zone; 2 active + 1 spare per zone |
| Mixed SM/MM building backbone | 12-core custom | SM + OM4 mix | Custom per project | SM sub-units for inter-floor WAN; MM sub-units for local LAN |
† Always include at least 20% spare fiber capacity per sub-unit for future moves, adds, and changes (MAC). Consult TIA-568.3-D for campus and horizontal structured cabling design guidance.
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1Plan branch points before pulling. Mark conduit entry points on the cable reel using cable ties or tape at the distances calculated from your floor plan. This avoids opening the outer jacket at incorrect positions after the pull.
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2Pull with a stocking grip on the outer jacket. Attach the pulling stocking to the full cable body - never to individual sub-units. Keep pulling tension below 800 N (use a tension meter for runs over 30 m or vertical sections). Lubricate for conduit pulls exceeding 20 m.
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3Open the outer jacket at branch points. At each marked position, longitudinally slit and remove a 150–200 mm window of outer jacket using a ringing tool or cable slitter - do not use diagonal cutters. The inner sub-units will be visible; their individual jackets remain intact.
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4Separate and redirect the target sub-unit. Identify the correct sub-unit by jacket color. Gently pull it clear of the bundle and route it toward the zone endpoint. Use a helical binding tape or fabric sleeve to close the outer jacket opening around the remaining sub-units before continuing the trunk.
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5Terminate sub-unit fibers at the endpoint. Strip the sub-unit jacket to expose the individual 0.9 mm tight-buffered fibers. Install LC, SC, or FC connectors using standard crimping tools - no gel cleaning required. Allow at least 1 m of sub-unit slack at each termination point for future re-termination.
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6Riser support - mandatory for vertical runs. Clamp the trunk cable to the riser wall or cable ladder every 1.5–2 m using P-clips sized to the cable OD. For a 24-core cable at 198 kg/km in a 30 m riser, total weight load approaches 59 N; without support clamps this load accumulates at the bottom conduit entry and risks long-term jacket deformation.
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7Cap and label all unused sub-units. At the terminus of each unused sub-unit, fit dust caps and wrap the exposed end with vinyl tape. Label each sub-unit with the zone designation at both the IDF and the branch point, and update the cable schedule immediately after installation.
Q1: What is the core structural difference between a sub-unit distribution cable and a standard bundle cable?
In a standard GJFJV bundle cable, all fibers share a single outer jacket with no internal division - all fibers must be accessed together. In a sub-unit distribution cable, fibers are pre-grouped into mini-cables (sub-units) inside the main trunk, each with its own individual jacket, color ID, and aramid reinforcement. This means you can open the outer jacket at any point along the route, peel away the sub-unit needed for that zone, and route it independently - while the remaining sub-units continue to the next branch point completely undisturbed.
Q2: Can I mix single-mode and multimode sub-units in the same trunk cable?
Yes, on custom OEM orders. For example, a 12-core trunk can be built with four 2-fiber SM G.652D sub-units (for inter-floor WAN links or PACS imaging) and two 2-fiber OM4 sub-units (for local floor LAN). Sub-unit jacket colours differentiate the fiber types visually. This hybrid approach is particularly popular in hospital and research facility cabling where single-mode backbone and multimode floor distribution share the same riser conduit.
Q3: Why is the short-term tensile rating (800 N) significantly higher than the bundle cable's 600 N?
Distribution cables are built for backbone and riser roles - longer pulls, heavier cross-sections, and greater conduit friction than horizontal bundle cables. The higher pull rating comes from two sources: (1) heavier-gauge aramid yarn in the outer jacket, and (2) additional aramid reinforcement within each sub-unit's individual jacket. Together they allow the cable to survive the friction loads of a 50 m conduit pull or carry its own weight over a 40 m vertical riser without approaching the fiber's strain limit.
Q4: How do I identify which sub-unit to peel at each branch point?
Each sub-unit has a distinct outer jacket colour. Before installation, record the sub-unit colour assignment in your cable schedule (e.g. blue sub-unit → Zone A, orange sub-unit → Zone B). At each branch-point window, the sub-unit jacket colours are immediately visible. Additionally, at the IDF end all sub-units are labelled with sticky-back zone tags before the trunk is pulled, so even if one tag is obscured at a mid-route access point, the IDF record confirms the assignment.
Q5: Does Glory Optical offer factory pre-terminated versions of this cable?
Yes. We offer pre-terminated distribution assemblies where sub-units arrive with LC/SC/FC connectors (UPC or APC) factory-installed at one or both ends. Pre-terminated assemblies eliminate field termination entirely - install teams simply pull the trunk, peel the sub-units at marked positions, and plug in. Lead times are slightly longer (typically 3–5 additional working days) due to factory test and polish, but on-site installation time can be reduced by 60–70% compared to field termination, making them cost-effective for large-scale fit-outs.
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