Byte

Description

0, 1

Tag 0x2755

2, 3

Length Variable

4, 5

Value[0] User information layer 1 protocol

0x01 CCITT standardized rate adaption V.110 [7] and X.30
[8].

0x02 Recommendation G.711 [10] Mu Law

0x03 Recommendation G.711 A-law

0x04 Recommendation G.721 [11] 32 K bits/s ADPCM and
recommendation I.460 [15]

0x05 Recommendations H.221 and H.242

0x07 Non CCITT standardized rate adaption.

0x08 CCITT standardized rate adaption V.120 [9].

0x09 CCITT standardized rate adaption X.31 [14] HDLC
flag stuffing.

All the other values are reserved.

Value[1] User Rate

0x00 Rate is indicated by E bits specified in
Recommendation I.460 or may be negotiated in-band.

0x01 0.6 k bits/s Recommendations V.6 [16] and X.1 [17]

0x02 1.2 k bits/s Recommendation V.6

0x03 2.4 k bits/s Recommendations V.6 and X.1

0x04 3.6 k bits/s Recommendation V.6

0x05 4.8 k bits/s Recommendations V.6 and X.1

0x06 7.2 k bits/s Recommendation V.6

0x07 8 k bits/s Recommendations I.460

0x08 9.6 k bits/s Recommendations V.6 and X.1

0x09 14.4 k bits/s Recommendation V.6

0x0a 16 k bits/s Recommendations I.460

0x0b 19.2 k bits/s Recommendation V.6

0x0c 32 k bits/s Recommendations I.460

0x0e 48 k bits/s Recommendations V.6 and X.1

0x0f 56 k bits/s Recommendation V.6

0x10 64 k bits/s Recommendation X.1

0x15 0.1345 k bits/s Recommendation X.1

0x16 0.100 k bits/s Recommendation X.1

0x17 0.075/ 1.2 k bits/s Recommendations V.6 & X.1

0x18 1.2/0.075 k bits/s Recommendations V.6 & X.1

0x19 0.050 k bits/s Recommendations V.6 & X.1

0x1a 0.075 k bits/s Recommendations V.6 & X.1

0x1b 0.110 k bits/s Recommendations V.6 & X.1

0x1c 0.150 k bits/s Recommendations V.6 & X.1

0x1d 0.200 k bits/s Recommendations V.6 & X.1

0x1e 0.300 k bits/s Recommendations V.6 & X.1

0x1f 12 k bits/s Recommendations V.6

All the other values are reserved.

Value[2] Intermediate Rate

0x00 Not used

0x01 8 k bits/s

0x02 16 k bits/s

0x03 32 k bits/s

All the other values are reserved.

Value[3] Physical properties

Negotiation Indicator:

0 In-band negotiation not possible.

1 In-band negotiation possible.

Network Independent Clock (NIC) on Transmit:

0 Not required to send data with network independent.

1 Required to send data with network independent clock.

Network Independent Clock (NIC) on Receive:

0 Cannot accept data with network independent clock
(sender does not support this optional procedure).

1 Can accept data with network independent clock
(sender does support this optional procedure).

Flow Control on Transmit:

0 Not required to send data with flow control mechanism.

1 Required to send data with flow control mechanism.

Flow control on Receive:

0 Cannot accept data with flow control mechanism
(sender does not support this optional procedure).

1 Can accept data with flow control mechanism
(sender does support this optional procedure).

Header / No Header:

This provides rate adaption header/ no header information.

0 Rate adaption header not included.

1 Rate adaption header included.

Multiple Frame establishment support in data link:

0 Multiple frame establishments not supported.
Only UI frames allowed.

1 Multiple frame establishments supported.

Value[4] Physical Mode

Synchronous/ Asynchronous:

0 Synchronous data.

1 Asynchronous data.

Mode of operation:

0 Bit transparent mode of operation.

1 Protocol sensitive mode of operation.

Logical Link Identifier Negotiation:

0 Default LLI=256 only.

1 Full protocol negotiation.

Assignor/ Assignee:

0 Message originator is "default assignee".

1 Message originator is "assignor only".

In-band negotiation:

0 Negotiation is done with user information messages on
a temporary signaling connection.

1 Negotiation is done in-band using logical link zero.

Duplex Mode:

0 Half Duplex.

1 Full Duplex.

Value[5] Number of stop bits

0x00 Not used

0x01 1 bit

0x02 1.5 bits

0x03 2 bits

All the other values are reserved.

Value[6] Number of data bits

0x00 Not used

0x01 5 bit

0x02 7 bits

0x03 8 bits

All the other values are reserved.

Value[7] Parity

0x00 Odd

0x02 Even

0x03 None

0x04 Forced to 0

0x05 Forced to 1

All the other values are reserved.