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Product

Aerospace & Avionics Data Bus & RF CablesASCB-C & ASCB-D Bus100 Ω / 120 Ω Twinax-55 to +200 °C FAR 25.853

ASCB-C / ASCB-D Avionics Standard Communications Bus CableASCB-C / ASCB-D · 100 Ω / 120 Ω ± 6 Ω · 22–26 AWG SPC/Alloy · Foam FEP (78 % VoP) · Foil

ASCB-C / ASCB-D Avionics Standard Communications Bus Cable is a high-integrity 100 Ω or 120 Ω fault-tolerant avionics data bus twinax/quadrax cable engineered for dual-redundant Integrated Modular Avionics (IMA), Primus Epic / SPZ-8000 flight control

EMC screen
Low-EMC design
Flame-retardant
Approved
Order designation
ASCB-C 120 Ω Twinax 1×2×24 AWG Foam FEP
Outer Ø ≈
3.25 mm
Metal weight
10.2 kg/km
Total weight ≈
18.2 kg/km
Min. bend R (fixed)
16 mm
All sizes (4)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Impedance Z₀
100 Ω or 120 Ω
ASCB-D (100 Ω) & ASCB-C (120 Ω)
Topology
Twinax or Quadr
Single pair or dual-redundant bus
Mutual cap.
≤ 42–48 pF/m
Gas-injected foam FEP (78 % VoP)
Data rate
667 kbps to 20
HDLC / Manchester & Ethernet IMA
Shielding
100 % Foil +
High HIRF & lightning isolation
Temp. rating
-55 to +200 °C
Laser-markable FEP/ETFE/PTFE

Typical values for this cable type, based on ASCB-C / ASCB-D Avionics Bus / MIL-DTL-27500 — confirmed in the datasheet and quotation for your order.

Application fit

Is ASCB-C / ASCB-D right for your machine?

Designed for business jet, regional airliner, and helicopter Integrated Modular Avionics (IMA) cabinets (Modular Avionics Units / MAUs), Primary Flight Displays, Flight Guidance Computers, and NIC

Switchgear & control cabinet wiring

Suitable

Interconnects Modular Avionics Units (MAUs), NIC modules, and cockpit display units with ultra-low skew.

Fixed installation

Suitable

Lightweight fluoropolymer harness construction meets FAR 25.853 flammability and Skydrol fluid immunity.

Furnace, kiln & high-temp zone

Suitable

-55 °C to +200 °C continuous thermal rating for pressurized and unpressurized airframe bays.

Energy chain / drag chain

Not suitable

Airframe IMA bus cable is intended for fixed harness installation, not industrial drag chains.

S 369 C TP
Typical machinesIntegrated Modular Avionics (IMA) BaysBusiness & Regional Jet Flight DecksHelicopter Dual-Redundant Bus NetworksAvionics Bench & Iron-Bird SimulatorsMRO Cabin & Flight-Deck Retrofits

Construction

Layer by layer

22, 24, or 26 AWG (19-strand) silver-plated copper or silver-plated high-strength copper-alloy conductors in 1-pair twinax or 2-pair

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
119-strand SPC or Ag-Cu alloy conductors22, 24, or 26 AWG (19-strand) silver-plated copper or high-tensile copper alloy per SAEAS22759 / ASCB Spec
2Gas-injected foam FEP / PTFE dielectricLow-dielectric-constant cellular fluoropolymer (78–80 % VoP, 42–48 pF/m) tuned to 100 ΩASCB-C / ASCB-D
3100 % aluminised fluoropolymer/polyimidFull-coverage metallic tape screen providing 360° high-frequency HIRF isolationMIL-DTL-27500
4Silver-plated copper wire braid shield38 AWG silver-plated copper braid (≥ 90 % coverage) for low surface transfer impedanceMIL-DTL-27500
5UV-laser-markable FEP / ETFE / PTFEWhite (or colour-striped) fluoropolymer outer jacket rated -55 °C to +200 °C per FARFAR 25.853

ASCB-C 120 Ω ± 6 Ω Twinax (1×2×24 AWG)

Classic 120 Ω RS-485/HDLC physical layer ASCB-C bus cable for SPZ-8000 / Primus 1000/2000 avionics.

ASCB-D 100 Ω ± 5 Ω High-Speed Twinax (1×2×24 AWG)

100 Ω high-speed digital ASCB-D bus cable for Primus Epic Modular Avionics Units (MAUs) and 10/100BASE-T.

ASCB-D 100 Ω Quadrax (1×4×24 AWG Star-Quad)

Dual-channel 4-conductor quadrax construction fitting Size 8 quadrax avionics contacts.

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on ASCB-C / ASCB-D Avionics Bus / MIL-DTL-27500. Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance (ASCB-D
100 Ω ± 5 Ω (ASCB-D) / 120 Ω ± 6 Ω (ASCB-C)
Mutual pair capacitance
42.0 pF/m (120 Ω) / 46.5 pF/m (100 Ω)
Velocity of propagation (VoP)
78.0 % – 80.0 % (4.20 ns/m delay)
Intra-pair propagation skew
≤ 1.5 ns / 100 m
Max. operating voltage
600 V rms
Dielectric withstand test
1,500 V rms at 60 Hz

Thermal

Operating temperature range
-55 °C to +200 °C continuous
Storage temperature range
-65 °C to +200 °C
Flammability & smoke rating
FAA FAR 25.853, ABD0031, BSS 7230
Thermal shock stability
-55 °C to +200 °C per AS4373
Cold-bend rating
-55 °C without cracking
UV laser markability
High-contrast 355 nm UV laser printable

Mechanical

Conductor gauges available
22 AWG, 24 AWG, and 26 AWG (19-strand)
Outer jacket diameter (Twinax
3.15 mm (Twinax) / 3.95 mm (Quadrax)
Min. bend radius (fixed / install)
16 mm (5×D) / 32 mm (10×D)
Nominal weight (24 AWG Twinax
17.8 kg/km / 28.5 kg/km
Connector compatibility
Size 8 Twinax / Quadrax (D38999 & ARINC 600)
Crush & vibration endurance
Closed-cell foam fluoropolymer

Resistance

Aviation fluids & Skydrol
100 % resistant to Skydrol, Jet-A &
HIRF & lightning protection
100 % foil + ≥ 90 % SPC braid
Wet/dry arc-tracking
Passes SAE AS4373 arc-track test
Moisture & altitude sealing
Non-hygroscopic fluoropolymer core & sheath
Abrasion resistance
Tough extruded FEP / ETFE / PTFE
RoHS / REACH status
Aerospace RoHS compliant

Reference standards

Avionics bus architecture
ASCB-C (120 Ω) & ASCB-D (100 Ω) IMA Bus
Aerospace harness standard
MIL-DTL-27500 & SAE AS22759
High-speed aerospace data norm
SAE AS6070 / EN 3375
Airframe flammability standard
FAA FAR 25.853 / EASA CS-25
Aerospace wire test standard
SAE AS4373 / EN 3475
Quality certification
EN 10204 3.1 + 100 % TDR & skew report

Identification

Twinax core colours
Blue & White
Quadrax core colours
Blue, White, Orange, Green (or
Outer jacket colour
White (UV-laser markable)
Surface legend
TEBAOFLEX ASCB-C/D [100/120 OHM] 24AWG 200C
Standard spool lengths
152 m (500 ft), 305 m (1000 ft), 500 m
Batch traceability
Aerospace lot number & conformity cert

Sizes

4 standard configurations (ASCB-C / ASCB-D)

Dimensional, physical and high-frequency electrical parameters for ASCB-C / ASCB-D per ASCB-C / ASCB-D Avionics Bus / MIL-DTL-27500.

Dimensions & construction
Order designationConstruction / VariantConductorOuter Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard ASCB-C / ASCB-D variants
ASCB-C 120 Ω Twinax 1×2×24 AWG Foam FEP120 Ω Pair + Foil + 90% SPC Braid24 AWG (19×36 Alloy)3.2510.218.216
ASCB-D 100 Ω Twinax 1×2×24 AWG Foam FEP100 Ω Pair + Foil + 90% SPC Braid24 AWG (19×36 Alloy)3.1010.217.516
ASCB-D 100 Ω Quadrax 1×4×24 AWG Star-Quad2× 100 Ω Pairs + Foil + SPC Braid4 × 24 AWG (19×36)3.9519.528.520
ASCB-C 120 Ω Twinax 1×2×22 AWG Long-Run120 Ω Pair + Foil + 90% SPC Braid22 AWG (19×34 SPC)3.6515.025.418
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dimensions and weights are nominal production values subject to manufacturing tolerances per ASCB-C / ASCB-D Avionics Bus / MIL-DTL-27500.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % TDR differential impedance & skew100 Ω ± 5 Ω (ASCB-D) or 120 Ω ± 6 Ω (ASCB-C); skew ≤ 1.5 ns/100mEvery spool
1.5 kV rms AC dielectric & spark testZero breakdown core-to-core and core-to-shieldEvery spool
Sample tests
High-frequency attenuation & NEXT (quadrax)NEXT ≥ 50 dB at 100 MHz on quadrax; meets ASCB eye maskPer batch
FAR 25.853 flammability & Skydrol fluid testPasses vertical burn, smoke density, and fluid immersionQualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

ASCB-C (120 Ω) & ASCB-D (100 Ω)MIL-DTL-27500 / SAE AS6070FAA FAR 25.853 / ABD0031

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX ASCB-C/D [100/120 OHM] 24AWG
Delivery form
Spools, reels or export wooden drums
Standard reel lengths
100 m · 305 m (1000 ft) · 500 m · 1000 m
MOQ
100 m (stock) · 305–500 m (production)
Lead time
1–3 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFASCB-C / ASCB-D Avionics Standard Communications Bus Cable – technical datasheet4 sizes · construction, technical data, approvalsXLSXASCB-C / ASCB-D spec data (Excel)All 4 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

What is the electrical difference between ASCB-C and ASCB-D avionics data buses?
ASCB-C (Versions A/B/C) uses a 120 Ω ± 6 Ω RS-485/HDLC Manchester-coded bus running at 667 kbps across dual-redundant twisted-pair trunks, whereas ASCB-D (Version D, used in Primus Epic Modular Avionics Units) upgrades to a 100 Ω ± 5 Ω transformer-coupled 10/20 Mbps Ethernet-class physical layer available in both twinax and 4-wire quadrax.
Why can't 78 Ω ARINC 429 cable be substituted onto an ASCB-C or ASCB-D bus?
Using a 78 Ω cable on a 100 Ω or 120 Ω terminated ASCB bus creates a 22 % to 35 % impedance mismatch at every stub coupler and terminator, causing severe signal reflections that corrupt Manchester/HDLC zero crossings and trigger bus fault warnings.
When should 100 Ω Quadrax be chosen over 100 Ω Twinax for ASCB-D?
Choose 100 Ω Quadrax when terminating into Size 8 quadrax contacts on Modular Avionics Units (MAUs) where two independent 100 Ω differential pairs (Transmit and Receive, or Bus A and Bus B) are carried inside a single shielded cable. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.
Is this cable suitable for flight-simulator and iron-bird integration rigs as well as flying aircraft?
Yes, we supply identical FAR 25.853 airframe-certified spools for both flying MRO/OEM harnesses and full-flight simulator / iron-bird avionics racks. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.

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ASCB-C / ASCB-D Avionics Standard Communications Bus Cable

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