Inmarsat IsatM2M

Inmarsat IsatM2M

Frequencies	1525 MHz,1559 MHz
Frequency Range	1525 MHz - 1559 MHz
Mode	USB
Modulation	MFSK
ACF	—
Emission Designator	—
Bandwidth	1.024 kHz
Location	Worldwide
Short Description	IsatM2M Service operated by Inmarsat on existing Inmarsat-D/D+ infrastructure.
I/Q Raw Recording	Download file
Audio Sample

IsatM2M Paging Service was operated by Inmarsat on (then) existing Inmarsat-D/D+ infrastructure. It was used for transport vehicle security, industrial equipment monitoring (SCADA) and marine tracking. Similar waveform to Inmarsat-D/D+ but employs faster bit rate and wider bandwidth.

Characteristics

32-MFSKMultiple Frequency Shift-Keying, 16 symbols/sec, 32 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). shift. ~80 bpsBits per second (bps) max data rate. Has idling mode and preamble. Compared to the Inmarsat-D/D+ waveform, IsatM2M is 2-4x faster, with maximum data rate of 80 bpsBits per second (bps) (compared with Inmarsat-D/D+'s maximum datarate of 20-40 bpsBits per second (bps)).

Sunset

Inmarsat withdrew M2M from service on the 31st of December 2021, replacing it with IsatData Pro.

Samples

(Sample contributed by RAPIDBIT)

See Also

• Inmarsat-D(D+) Downlink

Additional Links

• Inmarsat IsatM2M
• Presentation by SkyWave on IsatM2M Service
• FCC Public Notice
• LXE Inc. FCC Form 312 – Notification of Minor Modification
• ISAT M2M End of Life

Additional Images

Idle periods and data segment with preamble. Wireless Characteristics of Inmarsat-D/D+/IsatM2M Transceiver, SkyWave SureLinx 8100. Inmarsat Band, with 5 IsatM2M channels with traffic and 2 Inmarsat-D/D+ idling channels Inmarsat-D MFSKMultiple Frequency Shift-Keying downlink channels seen from AOR-W Satellite (American Ocean Region, West). We see on the left one IsatM2M channel, with the other channels on the right being Inmarsat-D/D+ channels.