I have been facing two slightly related issues with PTCL Broadband DSL connection consistently ever since I started using the service.
I am using the de facto SmartAX MT880 DSL modem PTCL ships out as CPE with their broadband package along with YCL CPF105C ADSL splitter device. The modem is set up in a common household setting — the wire from the land-line sockets is plugged into the LINE port of the splitter, the only telephone set in the house hooked through with a wire to the PHONE port of the splitter, while the MODEM port connected to the modem through another cable. The internal configuration settings for the modem are exactly as PTCL recommends with, notably, VPI/VCI ratio under WAN Settings set to 0/103. Encapsulation is configured to LLC, with connection and wan types set to PPPoE and PPP, respectively.
What are the issues I am facing? The modem de-syncs occasionally. That’s issue number one. The second issue, which is more frustrating, is that while the ADSL link remains established, connectivity breaks down, comes back, breaks down again, and so on and so forth. The latter behaviour manifests itself a lot more often than the former, although at times the former logically follows the latter (but not always and not most of the time). With the issue with failing DNS that is not uncommon with PTCL DSL, I should like to clarify what I mean by “connectivity breaking down”. The default gateway for my PVC-0 link is always 18.104.22.168. Therefore, when I confronted issue number two the first few times, I figured if PTCL’s backbone connectivity is dead when my connectivity is dead, I would still logically be able to get to the gateway without any loss of packets. So, ever since, I have made it a habit when I log in to the system to open up a terminal and keep a session running in the background that is consistently pinging the gateway. When the connectivity breaks down, the ping to gateway breaks down as well (and vice versa). That outright rules out faulty DNS as one of the possible causes of the issue. The ping to gateway simply breaks.
On some days, it would just work fine–the ping to the gateway would run smoothly without so much as a hitch. On other days, it would either run fine for a while and then start breaking off, or start breaking off and on from the outset. That breaking part is most annoying, as there is no fixed pattern to the behaviour, and once the connectivity breaks, all my sessions naturally get timed-out without my realising what has happend not until it becomes perceptible. Make the break-ups more consistent, and you end up getting really frustrated, because you just can’t keep a session open with any other host for long without breaking off or timing out.
I have talked to PTCL support folks–but you know how support is. They seem to suspect there is noise in my phone line or the ADSL splitter is faulty. I have ruled out the latter by smacking in the old ADSL splitter I have from my previous DSL provider, Cyber.net. As for a noisy phone line, I am not certain. When I had DSL service from Cyber.net, I never faced any of these issues. Even during rain, when I couldn’t hear the tone properly due to excessive noise on the telephone set, the DSL worked brilliantly. It is only since I got PTCL DSL subscribed to that I have been facing similar issues.
If anyone reading this is using or has used PTCL DSL, I would like to hear your thoughts about and experiences of the service and any similar issues that you are facing or may have faced. Thanks.