CHM86 — crash hardened video memory module

Not just a hardened disk. Evidence outlives the event.

CHM86 marketing sheet (PDF) Specification package

The CHM86 is a crash protected memory unit for onboard video and event data, tested to IEEE Std 1482.1-2013 and FRA 49 CFR Part 229. That makes it usable as the certified crashworthy memory module §229.136(a)(5) requires for a cab image recording system, and as the crash and fire protected storage APTA RT-OP-RP-024-19 sets out for transit operating compartments.

Data arrives over a single Ethernet connection that also carries the unit's power, so the CHM86 is added to a new or existing system as a network storage target. Inside, the storage medium sits in a crash protected steel body; the power supply and controller electronics are mounted outside it in a separate anodised aluminium housing, thermally and mechanically isolated from the memory.

At a glance

Standard: IEEE 1482.1-2013, FRA 49 CFR 229
Capacity: 256 GB, 512 GB or 1 TB
Interface: Gigabit Ethernet, PoE
Usage: Video
Weight: approx. 4 kg (9 lb)
Manufactured: USA - FTA Buy America compliant

How the recording survives

Receive

Many camera channels arrive concurrently over a single PoE cable that carries both power and data.

Sustain

11 MB/s written continuously and indefinitely — the recording never stops.

Sequence

Files are deleted only to make room for new recording, and only oldest first. The recording application drives that rotation; the module permits no other deletion pattern.

Hold

Onboard supercapacitor — a power cut still leaves a readable file.

Scale

Up to 1 TB in a 4 kg package.

Report

A REST API reports storage health, wear and power-on hours, and runs subsystem self-tests.

Crash survivability

Tested to IEEE Std 1482.1-2013 and FRA 49 CFR Part 229. Crash survivability testing by DTC Dynamic Test Center AG, Switzerland.

Criterion	Applied level
Fire	750 °C for 60 min, then 260 °C for 10 h
Static crush	110 kN (25,000 lbf) for 5 min
Shock	55 g peak, 100 ms
Penetration	6.4 mm dia. steel bolt, 23 kg (50 lb), dropped from 1.5 m (5 ft)
Fluid immersion	48 h in diesel #1 and #2, water, salt water and oil; 10 min in extinguishing agent
Hydrostatic	15 m depth for 48 h

Mechanical and environmental

Parameter	Value
Dimensions (W×H×D)	102.7 × 170 × 102.7 mm
With bracket	150 × 170 × 106.4 mm
Weight	approx. 4 kg (9 lb)
Housing	steel / anodised aluminium
Colour	RAL 2003 pastel orange
Protection class	IP67 internal housing (leak protection); IP20 external housing (mechanical protection)
Operating temperature	-40 °C to +85 °C
Storage temperature	-55 °C to +85 °C
Humidity	EN 50155, ≤ 75 % annual mean
Elevation	≤ 2,000 m, EN 50125-1 class AX
Shock / vibration	EN 61373 cat. 1, class A
Fire behaviour	EN 45545-2, hazard level 3
MTBF	500,000 h (SN 29500)

Electrical, interfaces and storage

Parameter	Value
Power supply	PoE, IEEE 802.3af Class 0
Power, maximum	15.40 W
Power, typical	approx. 2.1 W idle, approx. 3 W under load
Supply voltage	44–57 V nominal (37–57 V range)
Ethernet	1 × 10/100/1000 Mbit/s
Connector X12	M12, 8-pin female socket, X-coded
Service port X16	USB 2.0 host, M8 4-pin female socket
Grounding	M5 stud, min. 10 mm² / AWG 7
Storage medium	solid-state industrial flash
Capacity	256 GB · 512 GB · 1 TB
Write throughput	approx. 90 Mbit/s (11 MB/s) sustained
File access	SMB, NFS (synchronous), web UI
Monitoring	REST API (JSON) and web UI

Made in the USA

All CHM Modules are Manufactured in the USA - FTA Buy America compliant

Standards

IEEE Std 1482.1-2013	Crashworthiness of the memory module, and with it the 1999 edition criteria
FRA 49 CFR Part 229	Crashworthy ERMM criteria of Appendix D, Section C, Option A
IEC 62625-1	On-board driving data recording, including magnetic field
EN 50155	Electronic equipment on rolling stock
EN 50121-3-2	Electromagnetic compatibility on board
EN 50153	Protection against electrical hazards
EN 61373	Shock and vibration, category 1 class A
EN 45545-2 HL3	Fire behaviour of materials
EN 50125-1 / EN 50124-1	Environmental conditions and insulation coordination
NFPA 130	Fixed guideway transit and passenger rail systems — compliant
LVVR Regulations, Canada	SOR/2020-178 requires a crash-protected memory module meeting IEEE 1482.1-2013, holding 48 hours of data

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