[asterisk-ss7] SIOS vs SIO

[Matthew Fredrickson]

On Jun 21, 2007, at 8:17 AM, TCB wrote:

> I have the a problem testing libss7 w ss7linktest . I receive SIO  
> from Telco and Send back SIOS , i this
> this right , a quick check on ITU Q.781 - 1.4 shows me

This is incorrect, based on your debug output.  See below.

>
> PURPOSE: To check "Aligned ready" Timer T1 and "Proving period"  
> Timer T4 (Normal)
> PRE-TEST CONDITIONS: Link out of service
> EXPECTED SIGNAL UNIT SEQUENCE:
>         SP      B                                            
> SP        A
> Link                                                   Link
>                             <------------------------- 1–0     SIOS
> 1–0     SIOS                ------------------------->
>                                                             :  start
>                             <------------------------- 1–0     SIO
> 1–0     SIO                 ------------------------->
>                             <------------------------- 1–0     SIN
> 1–0     SIN                 ------------------------->
>                                                                     
> T4 (Pn)
>                             <------------------------- 1–0     FISU
>                                                                    T1
>                             <------------------------- 1–0     SIOS
>
>
> root at ss7:~/libss7-trunk# ./ss7linktest 1 itu 27 1
> Starting link 1
> Link state change: IDLE -> NOTALIGNED
> Len = 4 [ ff ff 01 00 ]
> FSN: 127 FIB 1
> BSN: 127 BIB 1
> >[0] LSSU SIO
>
> Len = 2 [ ff ff ]
> FSN: 127 FIB 1
> BSN: 127 BIB 1
> <[0] LSSU SIOS
>
> Link state change: NOTALIGNED -> NOTALIGNED
> Len = 4 [ ff ff 01 00 ]
> FSN: 127 FIB 1
> BSN: 127 BIB 1
> >[0] LSSU SIO

Your interpretation of these messages is incorrect.  > is what you  
send and < is what you receive.  libss7 is sending SIO (to notify the  
other end to bring the link up) and receiving SIOS from the other  
end.  It sounds like a problem with the other side.  Maybe the link  
isn't turned up

Matthew Fredrickson