The mode field is encoded as follows:

(octet 2)

Bits

8 7 6 5 4 3 2 1

0 0 0 0 0 0 0 0    signalling only

0 0 0 0 0 0 0 1    speech full rate or half rate version 1

1 1 0 0 0 0 0 1    speech full rate or half rate version 1 in VAMOS mode (Note 3)

0 0 1 0 0 0 0 1    speech full rate or half rate version 2

1 1 0 0 0 0 1 0    speech full rate or half rate version 2 in VAMOS mode (Note 3)

0 1 0 0 0 0 0 1    speech full rate or half rate version 3

1 1 0 0 0 0 1 1    speech full rate or half rate version 3 in VAMOS mode (Note 3)

1 0 0 0 0 0 0 1    speech full rate or half rate version 4

1 0 0 0 0 0 1 0    speech full rate or half rate version 5

1 1 0 0 0 1 0 1    speech full rate or half rate version 5 in VAMOS mode (Note 3)

1 0 0 0 0 0 1 1    speech full rate or half rate version 6

0 1 1 0 0 0 0 1    data, 43.5 kbit/s (downlink)+14.5 kbps (uplink)

0 1 1 0 0 0 1 0    data, 29.0 kbit/s (downlink)+14.5 kbps (uplink)

0 1 1 0 0 1 0 0    data, 43.5 kbit/s (downlink)+29.0 kbps (uplink)

0 1 1 0 0 1 1 1    data, 14.5 kbit/s (downlink)+43.5 kbps (uplink)

0 1 1 0 0 1 0 1    data, 14.5 kbit/s (downlink)+29.0 kbps (uplink)

0 1 1 0 0 1 1 0    data, 29.0 kbit/s (downlink)+43.5 kbps (uplink)

0 0 1 0 0 1 1 1    data, 43.5 kbit/s radio interface rate

0 1 1 0 0 0 1 1    data, 32.0 kbit/s radio interface rate

0 1 0 0 0 0 1 1    data, 29.0 kbit/s radio interface rate

0 0 0 0 1 1 1 1    data, 14.5 kbit/s radio interface rate

0 0 0 0 0 0 1 1    data, 12.0 kbit/s radio interface rate

0 0 0 0 1 0 1 1    data, 6.0 kbit/s radio interface rate

0 0 0 1 0 0 1 1    data, 3.6 kbit/s radio interface rate

0 0 0 1 0 0 0 0    data, 64.0 kbit/s Transparent Data Bearer (Note 2)

Other values are reserved for future use.

Note 1: The speech versions are also referred as follows

(see 3GPP TS 26.103):

full rate or half rate version 1: GSM FR or GSM HR

full rate or half rate version 2: GSM EFR (half rate version 2 not defined in this version of the protocol)

full rate or half rate version 3: FR AMR or HR AMR

full rate or half rate version 4: OFR AMR-WB or OHR AMR-WB

full rate or half rate version 5: FR AMR-WB (half rate version 5 not defined in this version of the protocol)

full rate or half rate version 6: OHR AMR (full rate version 6 not defined in this version of the protocol)

Note 2: This code point is only used for channel assignments made in GAN mode.

Note 3: This code point is only used for a mobile station that indicates support for VAMOS-II (see 3GPP TS 24.008).