CHM26 — high capacity crash hardened memory unit

The predecessor of the CHM86, still in production.

CHM26 brochure (PDF) Specification package

Still a current product

The CHM26 is the predecessor of the CHM86 and sits outside the CHM8X platform, but it is in production and fully supported. It reaches 1 TB against the same standards, and on some installations it is the better choice. It runs on a 24 to 110 V DC supply, so it does not need PoE, and it has on-board processing. Where the vehicle cannot deliver PoE to the memory, or where a wide-range DC supply is what the installation has, the CHM26 is the shorter retrofit. Where Ethernet with PoE is available, the CHM86 does the same job at about a third of the weight.

The CHM26 adds IEEE and FRA crash hardened memory to a new or an existing system with minimal modification. It is applied to IEEE Std 1482.1-2013 part 4.6 and FRA 49 CFR Part 229, Appendix D, Section C, Option A, and the housing carries the Certified DOT Crashworthy marking.

The unit connects over 10/100 Mbit/s Ethernet, with a 24 to 110 V DC wide range power supply and a web based service interface, so it can sit behind a video and voice recorder or a monitoring system. On-board processing capability means it does more than present a volume.

At a glance

Standard: IEEE 1482.1-2013, FRA 49 CFR 229
Capacity: 256 GB, 512 GB or 1 TB
Interface: Ethernet, 10/100 Mbit/s
Usage: Video
Power: 24 to 110 V DC, 10 W
Weight: approx. 13 kg (29 lb)
Manufactured: USA - FTA Buy America compliant

Certification

Under Appendix D to 49 CFR Part 229 a memory module for a cab image or audio recording device is treated as an event recorder memory module. The same crush, impact, fire and immersion criteria apply whether the payload is train data or video, which is why an image recording system cannot write to a commercial industrial SSD however rugged it is.

Crash protection performance

Criterion	Applied level
Static pressure	110 kN (25,000 lbf) for 5 minutes
Penetration	6.4 mm (0.25 in) steel bolt, 23 kg (50 lb), dropped from 1.5 m (5 ft)
Shock	55 g peak, 100 ms duration
Thermal load	750 °C for approx. 60 min (FRA); ⁢650 °C for approx. 30 min (IEEE); ⁢300 °C for approx. 60 min (IEEE); ⁢260 °C for approx. 10 h (FRA); ⁢100 °C for approx. 5 h (IEEE)
Tightness	No. 1 and No. 2 diesel (ASTM D975), water, salt water and lubricating oil, 48 h in each, plus 10 min immersion in fire extinguishing agent
Hydrostatic pressure	Fresh water and salt water at 15 m (50 ft) depth for 48 h
Protection category	IP 67 for the protected memory card unit; IP 20 for the outside housing

Made in the USA

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

Capacity

Internal flash memory in 256 GB, 512 GB or 1 TB, optimised for video data protection.

Interfaces and power

Interface — Ethernet, 10/100 Mbit/s
Service PC connection — web based service interface over Ethernet
Function — data recording and data downloading, with on-board processing capability
Power — 24 to 110 V DC wide range, 10 W

Mechanical and environmental

Parameter	Value
Width	160 mm (6.3 in) without bracket; 220 mm (8.7 in) with fastening bracket
Height	160 mm (6.3 in) without bracket; 165 mm (6.5 in) with fastening bracket
Depth	292 mm (11.5 in) without connectors
Weight	approx. 13 kg (29 lb)
Operating temperature	-25 °C to +70 °C
Storage temperature	-40 °C to +85 °C

Typical applications

Video and voice recording — cameras and audio written through a recorder to protected memory

Cabs and cab cars in commuter and intercity passenger service subject to 49 CFR 229.136, high-speed trainsets under 49 CFR Part 299 Appendix A, metro and light rail video programmes under APTA RT-OP-RP-024-19, and retrofit projects where an existing system has to be brought into compliance without replacing the recorder.

Specification package Request a quote