IrLAP V1.1 errata.March 2003

Proposed Errata for IrLAP Version 1.1

(First draft: March 10,2003) (Updated: March 17,2003)

(Voted: IrDA General Meeting, Tech Comm, March 26, 2003)

Following is a list of corrigenda for IrLAP Version 1.1.

The corrigenda are classified according to the following scheme:

•CORRECTION: a change required to correct an error in the existing document. Corrections may change the specified behavior of the protocol to match, that which was originally intended by the authors.

•CLARIFICATION: textual enhancement that provides clearer explanation of a protocol element without changing any behavior.

•MODIFICATION: a modification of the currently specified behavior that adds but does not delete any function from the protocol.

•CHANGE: a modification of the currently specified protocol that may add and or delete function from the protocol.

•PROBLEM: a known problem for which an alteration to the document has yet to be proposed.

Section 5.7.1.4.1.4.1.3 Discovery Flags (of XID)

MODIFICATION

The last paragraph of this section says:

Bit 3-7 are reserved for future use. These bits must be set to 0. Devices receiving the discovery flags should ignore these bits.

In order to accommodate fast-connect, we propose to modify the above as follows:

Bit 3 is the “fast connect” indication. When set, it indicates that the device sending this frame is capable of handling "fast connect". This flag should be used only in a one-slot XID command. For XID-rsp and multi-slot-XID-cmd, "fast connect" flag is reserved for future use.

Bit 4-7 are reserved for future use. All reserved flags must be set to 0. Devices receiving the discovery flags should ignore these bits.

Section 6.6.7 Additional BOFs (of Negotiation Parameters)

CORRECTION

There is a typographic error in this section of Version 1.1. The line:

bit 3 = 5 additional BOFs at 115200

should read:

bit 3 = 6 additional BOFs at 115200

Section 6.8.2 Overview (of Discovery Procedure)

MODIFICATION

In order to accommodate fast-connect, we propose to add the following at the end of this section.

There are two additional alternative responses for "fast connect". If the initiator is capable of performing both alternative responses, it may use a one-slot XID command with the "fast connect" flag set. The responder may ignore the "fast connect" flag and respond the same way as described in the preceding paragraph. But in addition, the responder may use one of two alternatives.

One alternative is to respond with a XID response frame at 115.2 kb/s and no extra BOF. In this case, the initiator must send a SNRM command frame at 115.2 kb/s, and the responder must send a UA response frame at 115.2 kb/s. After that, both the initiator and the responder enter NRM with the negotiated parameters of the SNRM-UA exchange. (See Section 6.11.)

The other alternative is to respond with a UA response frame at 115.2 kb/s and no extra BOF. After that, both the initiator and the responder enter NRM at 115.2 kb/s. The initiator must use the negotiation parameters in the UA response frame. The responder must use the following:

The 7-bit connection address is 0x02 (bit 0 is C/A).

Baud Rate: 9600bps and 115.2kbps (PV = 0x22)

Maximum Turn Around Time: 100ms (PV = 0x07)

Data Size: 512 bytes (PV = 0x0F)

Window Size: 1 (PV = 0x01)

Additional BOFs: 0 (PV = 0x80)

Minimum Turn Around Time: 1ms (PV = 0x04)

Link Disconnect/Threshold Time: 8 seconds (PV = 0x03)

Section 6.13 Media Access Control Procedures

In Section, we need to add two MODIFICATIONs.

For MAC Rule #4:

A stationary IrDA Device may own the IR media within its range even while it is in NDM. To maintain its ownership, such a device is required to always transmit something at 115.2 kb/s or lower data rate (or a SIP) within any given 500 ms time. This mimics Connection traffic and forces visiting IrDA devices to yield media access.

For MAC Rule #5:

A stationary IrDA Device that owns the IR media within its range may start to transmit (usually a one-slot XID command with the "fast connect" flag set) without first sensing the media.

Sections 6.8.3 and 6.11.3 State Charts

CLARIFICATION

We need to add the following note to these state charts.

Note: This State Chart does not reflect the fast connect MODIFICATIONs.