re: pktcRingCadence explanation changed from sig-draft-5 to sig-draft-7

Draft 5, 6 and an early version of 7 stated:
 
"00000000 means repeatable, and 10000000 means non repeatable. The value of 
            the repeatable field MUST be 0x00 or 0x80."
 
I think the original intent and wording should be retained and the description updated to:
 
The third of the reserved octets indicates 'repeatability'  
            and MUST be either 0x80 or 0x00 - the former value  
            indicating 'non-repeatability' and the latter indicating '
            repeatability'. 

Gordon
 
> 

Hi,

I have a question on ring cadence repeatable characteristics. The IETF draft-5 has the description for pktcRingCadnece as below:

PktcRingCadence ::= TEXTUAL-CONVENTION 

STATUS current 

DESCRIPTION 

" 

This object represents a ring cadence and repeatable 

Characteristics in a bit string format. The first two 

octets of the bit string represent the length in bits of 

the duration of the cadence (i.e., the number of bits that 

follow the third octet). The third octet is used to 

represent repeatable characteristics. 00000000 means 

repeatable, and 10000000 means non repeatable. Each bit 

after the third octet represents 50 ms and 1 represents 

ring and 0 represents silent. The first bit of the fourth 

octet is the first bit of the ring cadence. All bits are 

counted in network order such that the octet with only the 

first bit set will look like 10000000 bit sequence. A 

total of 264 bits can be set to represent 13200 ms of 

total cadence cycle. There will be at most 3 on/off 

transitions per cadence period." 

SYNTAX OCTET STRING (SIZE(4..36)) 

But the draft-7 has 

 

This object provides an encoding scheme for ring 

cadences, including repeatability characteristics. All 

fields in this object MUST be encoded in network-byte 

order. 

The first three higher order octets are reserved. The 

octets that follow are used to encode a 'bit-string', with 

each bit corresponding to 50 milliseconds. A bit value of 

'1' indicates the presence of a ring-tone and a bit value 

of '0' indicates the absence of a ring-tone, for that 

duration (50 ms) (Note: A minimum number of octets 

required to encode the bit-string MUST be used). 

The first two of the reserved octets MUST indicate the 

length of the encoded cadence (in bits) and MUST range 

between 1 and 264. (Note: The length in bits MUST also be 

consistent with the number of octets that encode the 

cadence). The MTA MUST ignore any unused bits in the last 

octet, but MUST reflect the value as provided on 

subsequent SNMP GETs. 

The third of the reserved octets indicates 'repeatability' 

and MUST be either 0x80 or 0x00 - the former value 

indicating 'repeatability' and the latter indicating 'non- 

repeatability'. 

The MTA MUST reject attempts to set a value that violates 

any of the above requirements" 

SYNTAX OCTET STRING (SIZE(4..36)) 

My question here is the item marked in RED is changed from draft-5 to draft-7. Is it a typo or the intended changes?? 0x80 is changed from

non-repeatable(draft-5) to repeatable(draft-7)!!!!

Thx, 

Satish Kumar,

Texas Instruments

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