Facility profile
This use case presents a complete, worked fiber infrastructure design for a representative generic colocation (colo) data center, built from the fiberopticom.com product portfolio. The design targets ANSI/TIA-942-C Rating 3 — concurrently maintainable with dual independent distribution paths — appropriate for a mid-tier colo operator offering SLA-backed uptime guarantees to enterprise tenants.
| Parameter | Specification |
|---|---|
| Gross floor area | 2,000 m² total; 1,200 m² white-space raised-floor data hall (~21,500 / 12,900 sq ft) |
| Total rack count | 120 customer cabinets (42U, 800 mm deep, 600 mm wide) in 10 rows of 12, plus 10 network/distribution racks |
| Power capacity | 2 MW installed (N+1 UPS, dual-path PDUs to each cabinet); average 8 kW per rack, dense zones up to 20 kW |
| Cooling | In-row cooling units, N+1 CRAH units, hot-aisle containment; operating temp 18–27°C per ASHRAE A1 |
| Network redundancy | Dual fiber entry, dual MDA cross-connects, dual diverse-routed path from each MDA to each HDA |
| Target certification | ANSI/TIA-942-C Rating 3 (concurrently maintainable) |
TIA-942-C distribution area design
The facility is divided into five named distribution areas per ANSI/TIA-942-C Section 6. All multimode runs use OM4 with MTP low-loss connectors (≤0.20 dB IL); all single-mode runs use OS2.
| TIA-942-C space | Location | Fiber role | Primary fiberopticom.com products |
|---|---|---|---|
| Entrance Room (ER) | Two physically separate 30 m² rooms at opposite building perimeter walls | ISP/carrier hand-off; OSP fiber termination; campus backbone splice point | OS2 24F MPO trunk cables; MPO 96 Fixed Panels (OS2); splice closures; OS2 pigtails |
| Main Distribution Area (MDA) | Central 25-rack cage; dual-fabric (MDA-A and MDA-B); physically separated from colo floor | Core routing/switching; primary fiber cross-connect; backbone distribution to all HDAs | 4U 576F MPO Enclosures (×4, two per fabric); OM4 Base-24 trunk cables MDA-to-HDA; OS2 Base-12 ER-to-MDA trunks; 1U 144F Sliding Panels |
| Horizontal Distribution Area (HDA) | One HDA rack per two customer rows (5 HDAs per fabric = 10 HDA racks total); end-of-row position | Aggregation/access switching; horizontal cross-connect from MDA backbone to EDA racks | 1U 144F MPO Sliding Panels (×2 per HDA rack); OM4 Base-8 trunk cables HDA-to-EDA; MPO-to-LC cassette modules (12F OM4 Type B) |
| Zone Distribution Area (ZDA) | Optional 2U insert in every 6th customer rack | Consolidation point for MACs without requiring HDA access; valuable in multi-tenant environments | 2U MPO Cassette Panels; short OM4 Base-8 trunk cables (1–5 m); MPO-to-LC fan-out harnesses |
| Equipment Distribution Area (EDA) | All 120 customer cabinet positions on the colo floor | Server/storage connectivity; ToR switch uplink termination | OM4 Base-8 MPO patch cords (ToR-to-panel); LC duplex patch cords (server-to-ToR); MPO fan-out harnesses for legacy 10G |
Rating 3 dual-fabric routing architecture
The defining characteristic of this Rating 3 design is the physical separation of Fabric A and Fabric B throughout the facility. No single point of failure — trunk, panel, rack, or switch — can interrupt service to any customer cabinet.
Each HDA rack contains panels from both Fabric A and Fabric B. Each customer cabinet's ToR switch is dual-homed to Fabric A and Fabric B aggregation switches in its serving HDA rack. Any single trunk failure, panel failure, or aggregation switch failure causes zero service interruption to any customer cabinet.
For Rating 4 (fault tolerant), both paths must be simultaneously active and automatically fail over. This requires dual-homed switching at every EDA rack. The fiber routing infrastructure designed here supports Rating 4 upgrade without any cabling changes — only switching equipment and configuration are added.
Complete fiber infrastructure bill of quantities
The following bill of quantities covers the complete fiber infrastructure for the reference facility — 120 customer cabinets, dual Rating 3 fabric, all TIA-942-C distribution areas. All items are from the fiberopticom.com portfolio.
| fiberopticom.com product | Specification | Qty | Application |
|---|---|---|---|
| 4U 576F MPO High-Density Fiber Enclosure | 48× 12F cassette slots; OS2/OM4; 19-inch rack-mount | 4 | MDA-A and MDA-B (2 enclosures per fabric) |
| 1U 144F MPO Sliding Patch Panel | 12× MPO rear ports; up to 144 LC front; sliding drawer; OS2/OM4 | 26 | HDA racks (2 per HDA × 10 HDAs) + 4 MDA + 2 ER |
| MPO 96 Fixed Fiber Patch Panel | 4× cassette slots; 96F; cold-roll steel; 19-inch rack-mount | 4 | ER termination panels (2 per ER room × 2 ER rooms) |
| OM4 Base-24 MPO Trunk Cable | 24F OM4; MTP female both ends; Type B polarity; 5–30 m custom lengths | 60 | MDA-to-HDA backbone (dual path: 30 per fabric × 2) |
| OM4 Base-8 MPO Trunk Cable | 8F OM4; MTP female both ends; Type B polarity; 3–15 m custom lengths | 480 | HDA-to-EDA horizontal runs: 4 trunks per rack × 120 racks |
| OS2 Base-12 MPO Trunk Cable | 12F OS2; MTP female both ends; Type B polarity; 10–50 m custom lengths | 8 | ER-to-MDA backbone (2 paths × 2 ERs × 2 fabrics) |
| MPO-to-LC Cassette Module (12F OM4) | 12F OM4; MTP rear; 6× LC duplex front; Type B polarity | 240 | HDA panels: 12 cassettes per panel × 2 panels × 10 HDA racks |
| MPO-to-LC Harness Cable (12F OM4) | 12F OM4 MPO to 6× LC duplex fan-out; 1 m breakout legs | 120 | Legacy 10G server breakout at EDA (1 per customer rack) |
| OM4 Base-8 MPO Patch Cord (low-loss) | 8F OM4; MTP male-female; 1–3 m; ≤0.15 dB IL | 480 | ToR switch uplinks to 1U 144F panel (4 per rack × 120 racks) |
| LC Duplex Patch Cord (OM4, 1 m) | OM4 LC-LC duplex; aqua; UPC | 1,440 | Server-to-ToR switch (12 per rack × 120 racks) |
| LC Duplex Patch Cord (OM4, 3 m) | OM4 LC-LC duplex; aqua; UPC | 240 | HDA cross-patching and spare inventory |
| OS2 LC Duplex Patch Cord | OS2 LC-LC duplex; 1–5 m; yellow; UPC | 48 | MDA and ER single-mode patching |
| 1U Horizontal Cable Manager | 1U dual-sided D-ring; steel; 19-inch rack-mount | 260 | One above and below each patch panel unit across all racks |
| Full-Height Vertical Fiber Manager | 42U vertical dual-channel; 19-inch rack-mount | 30 | All MDA, HDA, and EDA distribution racks |
| MPO Dust Caps (bag of 100) | Standard MPO dust caps; mixed male/female | 20 bags | Spare port protection across entire facility |
Fiber count summary
Total fiber counts by segment and cable type for the complete facility, confirming the bill of quantities above.
| Segment | Fabric | Cable type | Fibers/cable | Count | Total fibers |
|---|---|---|---|---|---|
| ER to MDA (backbone) | A + B | OS2 Base-12 MPO | 12F | 8 | 96F |
| MDA to HDA (backbone) | A | OM4 Base-24 MPO | 24F | 30 | 720F |
| MDA to HDA (backbone) | B | OM4 Base-24 MPO | 24F | 30 | 720F |
| HDA to EDA (horizontal) | A + B | OM4 Base-8 MPO | 8F | 480 | 3,840F |
| HDA to ZDA (optional) | A + B | OM4 Base-8 MPO | 8F | up to 40 | up to 320F |
| Total installed fiber (minimum) | ~5,376F | ||||
Link loss budget — worst-case EDA-to-HDA channel
Cumulative optical loss for the worst-case horizontal channel (maximum component count, maximum cable length), confirming compliance with ANSI/TIA-942-C Annex B and IEEE 802.3bm for 100G SR4.
| Loss element | Component description | fiberopticom.com spec | Loss (dB) |
|---|---|---|---|
| Tx connector at ToR switch | MTP connector mate at 1U 144F panel rear MPO port | MTP low-loss ≤0.20 dB IL | 0.20 |
| MPO patch cord (ToR to panel) | OM4 Base-8 MTP-MTP; 3 m | Patch cord IL ≤0.15 dB total | 0.15 |
| HDA panel cassette rear mate | MPO-to-LC cassette internal MPO mate | Cassette IL ≤0.35 dB | 0.35 |
| OM4 Base-8 trunk cable (HDA to EDA) | OM4 8F trunk; 15 m worst-case horizontal run | 0.003 dB/m × 15 m = 0.05 dB | 0.05 |
| EDA panel front LC adapter | LC adapter in 1U 144F sliding panel front face | LC adapter ≤0.15 dB | 0.15 |
| LC duplex patch cord (panel to server NIC) | OM4 LC-LC; 1 m; UPC | Patch cord IL ≤0.10 dB | 0.10 |
| Rx connector at server NIC | LC mate at server SFP28/QSFP28 transceiver cage | ≤0.15 dB | 0.15 |
| Total channel loss | 1.15 dB | ||
| Standard / limit | Maximum allowed | Actual channel loss | Verdict |
|---|---|---|---|
| TIA-942-C Annex B (OM4, EDA-to-HDA) | 2.0 dB at 850 nm | 1.15 dB | PASS — 0.85 dB margin |
| IEEE 802.3bm (100G SR4, Clause 95) | 1.9 dB channel | 1.15 dB | PASS — 0.75 dB margin |
| IEEE 802.3cd (400G SR4.2 / 50G lanes) | 1.5 dB channel | 1.15 dB | PASS — 0.35 dB margin |
The worst-case channel loss of 1.15 dB provides 0.35 dB of margin against the tightest IEEE 802.3cd 400G SR4.2 limit. Specifying fiberopticom.com MTP low-loss connectors (≤0.20 dB IL) rather than generic MPO connectors (up to 0.35 dB IL) is what makes this margin possible. Generic connectors at full rated loss would reduce the 400G margin to essentially zero.
Rack elevations by TIA-942-C space
Each TIA-942-C distribution area uses a standardized rack layout. All racks are standard 42U, 19-inch EIA-310 equipment cabinets with front and rear cable access.
7.1 Entrance Room (ER) rack — one per ER room, two total
Terminates outside plant fiber from carriers, splices to MDA backbone trunks, and provides the physical point of demarcation. Two identical ER racks deployed in physically separate rooms.
| U position | Equipment | fiberopticom.com product | Notes |
|---|---|---|---|
| 1U–2U | 1U blank panels × 2 | — | Top clearance / access guard |
| 3U | MPO 96 Fixed Fiber Patch Panel | MPO 96 Fixed Panel — OS2 SM | Carrier termination; Base-12 |
| 4U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | OS2 trunk cable routing |
| 5U | MPO 96 Fixed Fiber Patch Panel | MPO 96 Fixed Panel — OS2 SM | Second panel for carrier redundancy |
| 6U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | OS2 trunk routing |
| 7U–8U | 1U 144F MPO Sliding Panels × 2 | 1U 144F Sliding Panel — OS2 | ER-to-MDA backbone; Type B polarity |
| 9U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | Patch cord management |
| 10U–14U | Slack storage / cable coil brackets | — | OS2 service loop storage |
| 15U–25U | Carrier equipment space (reserved) | — | Carrier-installed demarcation equipment |
| 26U–40U | Spare — future expansion | — | 1U blanks installed |
| 41U–42U | PDU A + PDU B | — | Dual-corded; separate A and B feeds |
7.2 Main Distribution Area (MDA) rack — one per fabric, two total
Central fiber distribution frame for each fabric. Fiber frames in upper half; active switching in lower half. MDA-A and MDA-B are mirror images.
| U position | Equipment | fiberopticom.com product | Notes |
|---|---|---|---|
| 1U | 1U blank panel | — | Top clearance |
| 2U–5U | 4U 576F MPO Enclosure — Unit 1 (OM4) | 4U 576F MPO High-Density Enclosure | MDA-to-HDA OM4 backbone; 48 cassette slots; Base-24 |
| 6U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | OM4 Base-24 trunk routing |
| 7U–10U | 4U 576F MPO Enclosure — Unit 2 (OS2) | 4U 576F MPO High-Density Enclosure | ER-to-MDA OS2 backbone termination; Base-12 |
| 11U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | OS2 trunk routing |
| 12U–13U | 1U 144F MPO Sliding Panels × 2 (OM4) | 1U 144F Sliding Panel — OM4 | MDA internal patching and test access |
| 14U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | Patch cord management |
| 15U–16U | 1U 144F MPO Sliding Panels × 2 (OS2) | 1U 144F Sliding Panel — OS2 | Single-mode cross-connect patching |
| 17U–18U | 2U workspace / inspection clearance | — | Connector inspection and cleaning; never fill |
| 19U–22U | Core switch — Fabric A (4U, vendor-supplied) | — | 400G-capable spine; MPO uplinks to panels |
| 23U–26U | Core switch — Fabric B / redundant (4U) | — | N+1 redundancy per Rating 3 |
| 27U–28U | OOB management switch (2U) | — | Out-of-band / IPMI; LC duplex OS2 uplinks |
| 29U–38U | Spare — future core expansion | — | 10U; 1U blanks installed |
| 39U–40U | Vertical fiber manager (sides) | Vertical Fiber Manager | Routes trunk cables top-to-bottom |
| 41U–42U | PDU A + PDU B (dual-corded) | — | Separate A and B power feeds |
7.3 Horizontal Distribution Area (HDA) rack — one per row-pair, ten total
Each HDA rack serves two customer rows (24 cabinets) and contains panels from both Fabric A and Fabric B. Aggregation switches are customer-supplied.
| U position | Equipment | fiberopticom.com product | Notes |
|---|---|---|---|
| 1U | 1U blank panel | — | Top clearance |
| 2U–3U | 1U 144F Sliding Panels × 2 — Fabric A | 1U 144F Sliding Panel — OM4, Base-8 | MDA-A to HDA backbone termination; Type B polarity |
| 4U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | Fabric A trunk cable routing |
| 5U–6U | 1U 144F Sliding Panels × 2 — Fabric B | 1U 144F Sliding Panel — OM4, Base-8 | MDA-B to HDA backbone (diverse path); Rating 3 |
| 7U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | Fabric B trunk routing |
| 8U–9U | 1U 144F Sliding Panels × 2 — EDA horizontal | 1U 144F Sliding Panel — OM4, Base-8 | HDA-to-customer-rack horizontal runs |
| 10U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | EDA patch cord management |
| 11U | 1U workspace / inspection clearance | — | Connector inspection; do not fill |
| 12U–15U | Aggregation switch — Fabric A (4U) | — | Customer-supplied 25G/100G aggregation |
| 16U–19U | Aggregation switch — Fabric B (4U, redundant) | — | Rating 3 dual-path; EDA racks dual-home to both |
| 20U | 1U OOB management / console | — | Out-of-band management; LC duplex OS2 uplink |
| 21U–38U | Spare — future expansion | — | 18U; 1U blanks; pre-cabled trunk coils on VFM |
| 39U–40U | Vertical fiber manager (sides) | Vertical Fiber Manager | Trunk cable routing to overhead ladder rack |
| 41U–42U | PDU A + PDU B | — | Dual-corded; separate A and B feeds |
7.4 Equipment Distribution Area (EDA) — customer cabinet, 120 total
The top 4U of every customer cabinet is pre-deployed by the colo operator as standard base infrastructure before customer occupancy. Customer equipment occupies 5U–38U.
| U position | Equipment | fiberopticom.com product | Notes |
|---|---|---|---|
| 1U | 1U 144F MPO Sliding Panel (ToR uplinks) | 1U 144F Sliding Panel — OM4, Base-8 | 4× MPO rear pre-connected to HDA via Base-8 trunks; front LC for ToR uplinks |
| 2U–3U | Horizontal + D-ring cable manager × 2 | 1U D-Ring Cable Manager | ToR uplink patch cord routing |
| 4U | ToR switch (customer-supplied, 1U) | — | 25G/100G top-of-rack; uplinks via MPO patch cords to U1; 1 m MTP-MTP Base-8 |
| 5U–38U | Customer equipment | — | Servers, storage, appliances per customer deployment plan |
| 39U | Horizontal + D-ring cable manager | 1U D-Ring Cable Manager | Bottom cable management for power and console cables |
| 40U | 1U blank / KVM tray | — | Console access or blank panel |
| 41U–42U | PDU A + PDU B (vertical, customer-supplied) | — | Dual-corded power strips; separate A and B feeds |
Design standards and compliance
All rack elevations and infrastructure designs in this use case comply with the following standards. These are not aspirational — they are the minimum requirements verified at every project milestone.
| Standard | Scope | How it applies to this design |
|---|---|---|
| ANSI/TIA-942-C (2024) | Data center telecommunications infrastructure | Primary design framework; Rating 3 criteria govern all redundancy decisions; Section 6 cable management rules applied to all rack elevations |
| ANSI/TIA-568.3-D | Optical fiber cabling and polarity methods | Type B polarity used throughout; Base-8/12/24 architecture compliant with structured cabling clauses |
| IEC 61754-7 | MPO connector interface geometry | All fiberopticom.com MPO/MTP connectors comply; ensures interoperability across component vendors |
| IEC 61300-3-34 | MPO insertion loss measurement | Test documentation supplied with every fiberopticom.com assembly; incoming inspection verifiable |
| IEC 61300-3-35 | Connector endface cleanliness pass/fail | Inspection program specified for all connector mating events; four-zone pass/fail criteria applied |
| IEEE 802.3bm / 802.3cd | 100G SR4 and 400G SR4.2 transceiver loss budgets | Channel loss budget (Section 6) verified against both standards; 0.35 dB margin at 400G confirmed |
| ANSI/TIA-606-B | Data center labeling and administration | All panels, trunk cables, and patch cords labeled at installation with circuit IDs before active equipment installed |
| ASHRAE TC 9.9 (5th Ed.) | Thermal guidelines for data processing environments | H1 class applied to high-density zones; temperature and humidity requirements aligned with TIA-942-C |
Ready to spec your project?
This use case is available as the basis for your facility design. Contact fiberopticom.com for a project-specific bill of quantities, custom cable lengths, and engineering consultation.