Physical layer mapping specification

This specification describes how the transport layer is mapped onto various physical layers.

Z-Mesh frames can be sent directly on the physical layer or it can be tunneled in a layer 3 protocol like UDP/IP. Z-Mesh is a physical layer independent protocol, so it can run on anything that support an MTU-size greater that 64 bytes.

2.4 GHz

Frame format:

Preamble 3 bytes	Sync word 2 bytes	Len 1 byte	Z-Mesh frame N bytes

The physical layer properties are as follows:

Property	value
Frequency	2401 - 2483 MHz
Bits/sec	1 Mbps
Encoding	2-FSK with gaussian filter value of 0.5
Preamble	3 bytes 0xAA, 0xAA, 0xAA
Sync word	2 bytes 0xDD, 0xDD

Sub-GHz

Frame format:

Preamble 3 bytes	Sync word 2 bytes	Len 1 byte	Z-Mesh frame N bytes

The physical layer properties are as follows:

Property	value
Frequency	433MHz, 868.0 - 868.6 MHz, 915MHz
Bits/sec	50 Kbps
Encoding	2-FSK with gaussian filter value of 0.5
Preamble	3 bytes 0xAA, 0xAA, 0xAA
Sync word	2 bytes 0xDD, 0xDD

802.11 (ethernet)

TBD.

802.15.4

TBD.

Cellular Non-IP (NIDD)

TBD.

UDP

Frame format:

UDP header	Z-Mesh frame

The Z-Mesh frame is placed into the payload field in the UDP/IP packet.