I'm getting twice the download speed from my Xavi 7868r router than I get from my new zyxel p660hw-d1 router. The adsl ppp led blinks green then goes to permanent orange is this an alarm? The router came...
My Zyxel cruises along at 10 megabits with no problems. If you are using PPPoE then the light will turn green as the DSL synchs up and connects, and then, after the PPP connection is made (which means that the userid and password are accepted and the device is assigned things by the connection, the light will switch to orange. It blinks when data is transmitted, so this is a NORMAL state for someone who uses PPPoE or PPPoA for their connection. For someone like me who uses ethernet encapsulation, it stays green.
Are you actually on Telefonica de Espana? One of the things I've noted on my pre-configured router is that it uses specific settings for the ATM stuff that matches what my local Telco expects, and I can't change them. I would not expect this to work with anyone else's system.
But 50% speed? Wow, first thing I'd check is my MTU. Depending on what system you have, I'd set my max MTU to about 1400 on my PC to see if that fixes anything. The issue might be that you are getting fragmenting in the connection between the ZyXel and the main system. Problem is that most MTU (Maximum Transmission Unit) sizes are set to 1500. But the PPPoE adds an extra header for the encapsulation, which leaves you with a smaller MTU on that link, around 1492 I think so 1400 is a good number. Systems handle this 2 ways, One is to set the "don't fragment" bit, which means that an ICMP message is sent back, and the sending system has to learn that and start sending smaller packets - this takes time and can effect a short speed test.
The other possibility is that the Don't Fragment bit is not set. Then the router has to actually manipulate the packets - it splits them into multiple packets, called fragments, and the fragments then make their own way through to the final receiving system. This can be slower than just telling the sender to send smaller packets, because that only has to happen once.
It might be that while the ZyXel is fast at packets it is miserable at fragmentation because it is rarely used these days - almost everyone sets "don't fragment" and transmits smaller packets.
But there is a final thing. The ZyXel might just not be seeing the link as being as fast as your Xavi did, even though it is the same link.
You can access the ZyXel via the web and it will tell you how fast it thinks the link is. Say you are paying for a 5 meg link from your phone company. The Xavi sees it as a 5 meg link, and it has no problem getting a maxiumum of about 500 kilobits through it on a download. I have two links that are rated the same. One is seen as a 11 megabit link, the other is seen at about 6500 kilobits. I have a service call in with the telco.
Now, the ZyXel, when it is first turned on, tests the line. There are a lot of subcarriers, and it checks each for noise and loss - if it decides that most of them are not usable, it will rate the line as slower. Not sure why, it could be that the circuitry is marginal, or it could be an issue with the link or the card at the telco end.
So it decides that the link is only a 2.4 megabit link.
I would attach the Xavi to the line, attach to it with web and ask it how fast it thinks the line is.
Then I'd attach the ZyXel and see if it gets the same number. If there is a big discrepancy, I'd return it to where I got it, or if it is the telco I'd report it, they can access it remotely and see what is going on,
Jan 09, 2010 |
Zyxel P660HW-D1 Router