On Thu, 27 Jan 2005, Jose M Rodriguez wrote: JMR>Hi, JMR> JMR>get some free time to work in uadsl, but have a problem. Hope someone that JMR>can read ITU I.363 can answer this. JMR> JMR>Every usb adsl modem implementation I see doesn't obey aal5 pdu encoding JMR>standards, which requires that the PDU trailer come at the begin of a fresh JMR>cell.
That is not true. The trailer must be on the END of a cell. Before the trailer there will be padding bytes so that this happens. If, for example, you have a one byte PDU the AAL5 PDU will consist of 1 byte information, 39 bytes padding and 8 bytes trailer. JMR> JMR>So, I think that the modem must rework this and generate two cells on the JMR>wire. Due how this modems works, I doubt that the modem recalculate PDU CRC JMR>itself, So... JMR> JMR>Can someone confir if the CRC covers the PAD? I'm begin to think that the CRC JMR>only covers the playload and the pdu-trailer. The CRC covers everything but the CRC. The PAD must be filled with zeros though. harti _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
