Hello. I'm trying to do some kind of packet assembler disassembler between an interface x.21 from a 2507 and an interface rs232 from a pc.
I'm using a pic 16f873 with a set of max488 in the side of cisco and a max232 in the side of pc. I have a little problem with a strange (for me) packet. who looks like this: ..181818181041FFF1EDFF3FFEBD7E7FE517D3B3169A060606060606... If I toggle 0 and 1 and shift some bits: ... 01111110 01111110 01111110 01111110 11111011 11 10000000 00000011 10000100 10000000 00110000 00000000 01010000 10100000 01100000 00000110 (*) 10111010 (*) 00001011 (*) 00010011 (*) 00111010 01011001 01111110 01111110 01111110 ... The debug console is telling this: ppp: sending CONFREQ, type = 5 (CI_MAGICNUMBER), value = 605DD0C8 PPP Serial1: O LCP CONFREQ(0x1) id 12 len 10 MAGICNUMBER (6) 0x60 0x5D 0xD0 0xC8 Question 1. I can recognise this magic number on (*) (lsb first) 00000110 60 10111010 5D 00001011 D0 00010011 C8 but I cannot understand why the packet is "shifted 2 bits". I have read the datasheet of Hitachi HD64570 and it seems to be a 8 bit serial controller. Why the iddle caracter (0x7e) after the packet is not the same before the packet? Is there some kind of strangeous encapsulation? How must I read this packet? The router setup: int s1 ip address 192.168.0.1/24 clock rate 1200 encap ppp Question 2. The datasheet of this chip (Hitachi HD64570) tells that there are a mode asynchronous capable. Is there any command to tell the router how to make serial interface asynchronous? Question 3. If I'm able to read this serial interface with another standard like eia/tia-232 or v.35 will I see exactly the same bits ? i.e: the serial cable assemblie and pinouts force the way bits are transmitted ? I would highly appreciate any suggestion. Best regards. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=66373&t=66373 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
