The physical (PHY) layer refers to the layer in the network closest to a physical connection between devices, allowing them to communicate with the medium access control (MAC) layer above them. This is done via either frequency-shift keying (FSK) or orthogonal frequency-division multiplexing (OFDM) modulation.
For XBee for Wi-SUN devices, the PHY layer is configured via the following AT commands:
Interdependencies
The R? (Region Code), WC (Channel Plan), and WM (PHY Mode) parameters are dependent on one another. For a given R? value, only certain values are allowed for WC and WM. Four regulatory regions are currently available:
| R? | Short name | Long name |
|---|---|---|
0x01 |
NA |
North America |
0x02 |
JP |
Japan |
0x03 |
EU_LB |
Europe low band |
0x05 |
IN |
India |
Valid combinations are listed below, by applicable region, but can also be found when using XBee Studio to configure the XBee for Wi-SUN.
If an invalid combination of WC and WM is configured on the device, the following modem statuses will be sent out:
-
0x61: indicates the combination is invalid.
-
0x50: indicates the module is disconnected from the network.
The module will remain disconnected from the network until a valid combination of WC and WM is entered.
North America configurations
The following table describes the valid configurations for the North America region (0x01). WC specifies the channel plan, and WM specifies the PHY mode.
| WC | WM | Frequency range (MHz) | Modulation type | Channel spacing (KHz) | Notes |
|---|---|---|---|---|---|
0x01 |
0x02 |
902.2 to 927.8 |
FSK |
200 |
Default. |
0x01 |
0x12 |
902.2 to 927.8 |
FSK with FEC |
200 |
|
0x01 |
0x03 |
902.2 to 927.8 |
FSK |
200 |
|
0x01 |
0x13 |
902.2 to 927.8 |
FSK with FEC |
200 |
|
0x01 |
0x54 to 0x56 |
902.2 to 927.8 |
OFDM 4 |
200 |
MCS4 through MCS6 supported. |
0x02 |
0x05 |
902.4 to 927.8 |
FSK |
400 |
|
0x02 |
0x15 |
902.4 to 927.6 |
FSK with FEC |
400 |
|
0x02 |
0x06 |
902.4 to 927.6 |
FSK |
400 |
|
0x02 |
0x16 |
902.4 to 927.6 |
FSK with FEC |
400 |
|
0x02 |
0x08 |
902.6 to 927.2 |
FSK |
600 |
|
0x02 |
0x44 to 0x46 |
902.4 to 927.6 |
OFDM 3 |
400 |
MCS4 through MCS6 supported. |
0x03 |
0x08 |
902.6 to 927.2 |
FSK |
600 |
|
0x03 |
0x18 |
902.4 to 927.2 |
FSK with FEC |
600 |
|
0x04 |
0x33 to 0x36 |
902.8 to 927.6 |
OFDM 2 |
800 |
MCS3 through MCS6 supported. |
0x05 |
0x22 to 0x26 |
903.2 to 927.2 |
OFDM 1 |
1200 |
MCS2 through MCS6 supported. |
Japan configurations
The following table describes the valid configurations for the Japan region (0x02). WC specifies the channel plan, and WM specifies the PHY mode.
| WC | WM | Frequency range (MHz) | Modulation type | Channel spacing (KHz) | Data rate (kbps) | Notes |
|---|---|---|---|---|---|---|
0x15 |
0x02 |
920.6 to 928 |
FSK |
100 |
50 |
Default. |
0x15 |
0x54 |
920.6 to 928 |
OFDM 4 |
200 |
150-300 |
MCS2 4 through MCS6 supported. |
0x16 |
0x04 |
920.9 to 927.7 |
FSK |
400 |
100 |
|
0x16 |
0x05 |
920.9 to 927.7 |
FSK |
400 |
150 |
|
0x16 |
0x44 |
920.9 to 927.7 |
OFDM 3 |
400 |
300-600 |
MCS2 4 through MCS6 supported. |
0x17 |
0x07 |
921.0 to 927.6 |
FSK |
600 |
200 |
|
0x17 |
0x08 |
921.0 to 927.6 |
FSK |
600 |
300 |
|
0x18 |
0x34 |
921.1 to 927.5 |
OFDM 2 |
800 |
400-1200 |
MCS2 3 through MCS6 supported. |
Europe low band configurations
The following table describes the valid configurations for the Europe low band region (0x03). WC specifies the channel plan, and WM specifies the PHY mode.
| WC | WM | Frequency range (MHz) | Modulation type | Channel spacing (KHz) | Notes |
|---|---|---|---|---|---|
0x20 |
0x01 |
865.1 to 869.9 |
FSK |
100 |
Default. |
0x20 |
0x11 |
863.1 to 869.9 |
FSK with FEC |
100 |
|
0x21 |
0x03 |
869.9 to 869.9 |
FSK |
200 |
|
0x21 |
0x05 |
865.1 to 869.9 |
FSK |
200 |
|
0x21 |
0x13 |
865.1 to 869.9 |
FSK with FEC |
200 |
|
0x21 |
0x15 |
865.1 to 869.9 |
FSK with FEC |
200 |
|
0x21 |
0x54 to 0x56 |
865.1 to 869.9 |
OFDM 4 |
200 |
MCS4 through MCS6 supported. |
India configurations
The following table describes the valid configurations for the India region (0x05). WC specifies the channel plan, and WM specifies the PHY mode.
| WC | WM | Frequency range (MHz) | Modulation type | Channel spacing (KHz) | Notes |
|---|---|---|---|---|---|
0x27 |
0x01 |
865.1 to 867.9 |
FSK |
100 |
Default. |
0x27 |
0x11 |
865.1 to 867.9 |
FSK with FEC |
100 |
|
0x28 |
0x03 |
865.1 to 867.9 |
FSK |
200 |
|
0x28 |
0x05 |
865.1 to 867.9 |
FSK |
200 |
|
0x28 |
0x13 |
865.1 to 867.9 |
FSK with FEC |
200 |
|
0x28 |
0x15 |
865.1 to 867.9 |
FSK with FEC |
200 |
|
0x28 |
0x54 to 0x56 |
865.1 to 867.9 |
OFDM 4 |
200 |
MCS4 through MCS6 supported. |
