5 ms·
128 kbps ISDN had just about 40 ms latency. A significant improvement to a modem, which had about 100 ms+ IIRC, often a lot more, even 500 ms+. That low latenc
by vardump 5y ago
128 kbps ISDN had just about 40 ms latency. A significant improvement to a modem, which had about 100 ms+ IIRC, often a lot more, even 500 ms+.
That low latency made ISDN feel fast, sometimes even better than the first ADSL 512-1024 kbps modems that used interleave error correction method. Interleaving caused latency to be about 60-70 ms IIRC, making the higher bandwidth ADSL connection feel slower.
Of course then there was 144 kbps IDSL, which was really 2x 64 kbps ISDN + 16 kbps ISDN control channel.
- wmf 5y agoI remember my ISDN having closer to zero latency. It was kind of amazing watching Web pages jump onto the screen.
- toast0 5y agoIt feels like you're adding about 30-50ms onto the base latencoes here. Are you/were you fairly far from any major internet exchanges when ISDN and ADSL arrived?
- vardump 5y agoIIRC, those were ping latencies to the first hop discovered by using traceroute. ADSL was about 30-35 ms with fast path in use instead of interleave.
- toast0 5y agoMy experience with fast path ADSL was about 8 ms. I don't think I was on interleaved ADSL, but interleaved VDSL2 is about 20ms.
- vardump 5y agoWas this in year 2000 or so?
- toast0 5y agoI had ADSL1 at 6m/768k fast mode roughly 8ms latency from 2004-201x; the latency was pretty much constant (it did get slightly better when I replaced my modem after the first one died, but the improvement was less than a ms, but measurable). ADSL1 didn't change much after release afaik, changes came through ADSL2 and VDSL and such. The scourge that is PPP over Ethernet did become more popular later in the life of DSL though.
- jaywalk 5y agoIDSL was the first "high speed" connection I ever had at home. What a dream it was compared to dialup! Always on and 3-4x faster than the best dialup connection could do.