I have been working almost the whole day resolving a problem in my newly configured Linux Predictive Dialer which will be used in our remote office. The message that keeps on flooding my asterisk screen is “HDLC Bad FCS (8) on Primary D-channel of span 1” and then the the delta channel (DCH) of the ISDN interconnection between the Digium and Telco switch keeps on failing. I began to scout for answers from other Digium users who might have experienced the same problem in the past. Finally, I got an information from Digium website that the cause of the problem can be an I/O error or bad configuration. I hurriedly checked my configuration and found no error since it is exactly the same with other six dialers I configured previously which are all working properly. I was surprised at the other information I found from Digium website that the cause of the problem can be the driver of the built-in Intel 100Mbps ethernet card in my system. I began to wonder about the relationship of a network card and a Digium card installed in my Linux machine. Since I had no other choice, I tried to compile a new ethernet driver for my Linux but the problem after recompiling a new driver is still there. I also tried to recompile the Linux Kernel hoping that the problem will be resolved after I enabled ACPI but the result is still negative. I took my dinner thinking about the problem and I began to realize that I need to check for timing and clocking issue between the Digium card and the Telco switch. Without finishing my dinner, I hurriedly get back to the office and configure the proper clocking and T1 timing between the Digium card and the Telco equipment. ALAS! I was able to resolve the problem and now I will treat myself for another dinner since I wasn’t able to finish the previous dinner I had.

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