Cisco AG241 Bedienungsanleitung PDF herunterladen (Seite 7)

apcmag.com  june 06  apc labs

apc labs  june 06  apcmag.com

softwaresoftware

2006

JUNEDETAILED PRODUCT REVIEWS AND COMPARISONS

REVIEWS

BEST BUYS

LABS CHALLENGE

labs

apcmag.com  june 06  apc labs

apc labs  june 06  apcmag.com

softwaresoftware

2006

JUNEDETAILED PRODUCT REVIEWS AND COMPARISONS

REVIEWS

BEST BUYS

LABS CHALLENGE

labs

ur testing showed that

ADSL2+ modems with

interleaving turned on would hit a

peak speed of about 15.2Mbit/s.

But with interleaving turned off

and a finely tuned signal-to-noise

ratio, the best modem (Cisco

877W) edged up to a top speed

of 19.1Mbit/s real throughput.

But can the 802.11g wireless built

in to many of the “all in one”

modems actually transmit that

fast? The answer, unfortunately, is

no. The fastest modem we tested

was Dynalink RTA1046VW,

achieving an average transfer

speed of 15.13Mbit/s. To its credit,

sitting 30cm from the router, we

were able to get a 21.5Mbit/s

transfer rate, but, of course, if you

were sitting that close, there

would be no problem with

using an Ethernet cable.

The real test was our

“position 3” which was about 15

metres from the transmitter and

which required the signal to get

through wood and metal

partitions, office equipment,

people and other office

miscellanea. In this test, the

Draytek Vigor 2800 achieved

9.8Mbit/s, but the close-range

champ, the Cisco 877W, achieved

a measley 4% of that speed —

just 436Kbit/s.

The rather obvious conclusion

that can be drawn from these

results is that if you are able to

get a decent ADSL2+ throughput

at home, Ethernet is the way to

go. When 802.11n arrives next

year, the problem will hopefully

be resolved. Until then, it’s

probably a compromise between

wireless convenience and

throughput speed.

One very odd anomaly that we

observed with quite a few of the

modems was a very poor transfer

rate at close (30cm) range. The

affected modems were Belkin

F1PI241EGau, both Zyxel models

and the LevelOne WBR-3407A.

Wireless: an ADSL2+ bottleneck

MONITOR YOUR MODEM’S PERFORMANCE

Keeping an eye on your modem’s

performance isn’t always easy: while

you can usually get some statistics on

sync speed from the modem’s web

interface, you can’t usually get

information on throughput. Collecting

info on your PC’s actual throughput

isn’t always easy either if you have

multiple downloads going at once.

One way of doing it is to use

Simple Network Management Protocol

(SNMP), which is a way to gather

information from your router and

display it on your PC. You can monitor

all sorts of interesting things like the

signal-to-noise ratio, which, if

fluctuating, could indicate

a problem with your line.

Most home modems/routers do

support SNMP (with varying degrees

of completeness) and there are lots of

how-to guides available online. Some

of the more popular programs are

SNMP Traffic Grapher, PRTG and MRTG.

However, Australian enthusiasts

have made utilities for some specific

brands of modem/router that make it

a piece of cake to keep an eye on

what’s happening. Billion routers in

particular have a utility available

called “Billion SNMP Viewer”. There

was no homepage for it at the time

this article was written, but search

Google and you’ll turn up links to it

at Whirlpool (http://whirlpool.net.au)

soon enough.

Wireless modems by average

transfer rate.

TOP 5 wireless

1 Dynalink

RTA1046VW (15.13Mbit/s)

2 Draytek Vigor 2800VG

(14.97Mbit/s)

3 Billion 7404VGP (13.9Mbit/s)

4 Netcomm NB9W (12.81Mbit/s)

5 Thomson Speedtouch ST780WL

(12.76Mbit/s)

TOP 5 mid-range

1 D-LINK DVA-G3340S

(17.50 Mbit/s)

2 Linksys WAG54GP2

(15.95 Mbit/s)

3 Dynalink RTA1046VW

(15.37 Mbit/s)

4 Billion 7404VGP (14.62 Mbit/s)

5 DrayTek Vigor2800VG

(13.73 Mbit/s)

Top 5 modems at medium 10m range.

The trouble with testing wireless: big fluctuations can occur during testing.

We repeated the tests at each position three times and then averaged results.

Billion’s SNMP Viewer lets you keep an

eye on what’s happening on your modem.

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Kommentare zu diesen Handbüchern

Keine Kommentare

Cisco AG241 Bedienungsanleitung Seite 7

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Vernetzung Cisco AG241