[EMAIL PROTECTED] wrote:
Hello,
Maybe this is not a good question to ASN.1 post.
I had a trouble to read some CSN.1 source from 3GPP spec. CSN.1 is
new to me. Here is one sample code which is described by CSN.1 for
Packet Channel Description of 3 octets length. I know each IE
definition. But I don't know where it start from and where to end
from in bit level. I searched CSN from internet and didn't get what I
want. So I post it here for help.
For following sample, one set of hex code is given as {0x48, 0x74,
0x7E }. How can I interpret it in bit level? For example, where does
the fist item <channel type : bit(5)>, which is one 5 bits long item,
start from (LSB/MSB of which octet)?
First 5 bits start from MSB of the first octet. Here, first 5 bits
will be 01001, since the first octet is 0x48 = 01001000
Any of your help will be appreciated!
--Packet channel description CSN.1
< Packet Channel Description > ::=
< Channel type : bit (5) >
< TN : bit (3) >
< TSC : bit (3) >
{ 0
{ 0 < spare bit >
< ARFCN : bit (10) > -- non-hopping RF channel configuraion
| 1 < spare bit >
< MAIO : bit (6) > -- indirect encoding of hopping RF channel
configuration
< MA_NUMBER_IND : bit >
{ 0 < spare bits : bit (2) >
| 1 < CHANGE_MARK_1 : bit (2) >
}
}
| 1
< MAIO : bit (6) > -- direct encoding of hopping RF channel
configuration
< HSN : bit (6) >
};
--End of Packet channel description
Best regards
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