Cisco AG241 Manual de usuario descargar pdf (Pagina 4)

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

e knew from last year’s testing

that line sync speeds bear

very little relationship to actual

throughput. This was borne out

again in this year’s testing.

For example, the Draytek Vigor

synced at 21.2Mbit/s but only

achieved 8.4Mbit/s throughput at

1km — a whopping 60 per cent

difference. There were other

similarly bad examples, like the

Thomson Speedtouch 546 at 55 per

cent difference (23.1Mbit/s sync,

10.3Mbit/s throughput) and

Dynalink RTA1335 at 51% difference

(24Mbit/s sync, 11.7Mbit/s

throughput.) In fact, the average

gap between sync speed and

throughput was 39 per cent.

The best modems in terms of

the narrowest gap were D-Link DSL-

504T (30%), D-Link DVA-G3440S

(32%), Siemens Speedstream 6520

(33%), Billion 7300G (33%) and

Belkin F1PI241Egau (34%). All five of

these modems used slightly more

conservative sync speeds of 20-

22Mbit/s at 1km line length, which

suggests that if your modem aims

for the highest possible sync speed

it could actually result in much

lower actual throughput.

With such enormous disparity

between sync speed and actual

throughput, there’s not much point

paying heed to the speed at which

your modem syncs with the DSLAM.

You might be surprised to see

that the fastest actual transfer

speed recorded was 15.2Mbit/s,

despite the widely promoted

maximum 24Mbit/s speed of

ADSL2+. It’s possible the modems

could go faster if you live next to a

Telstra exchange. We didn’t do any

100m line-length testing as the

results would be irrelevant to most

readers. We did, however, notice

that tweaking DSLAM settings

outside of defaults could

dramatically increase modem

throughput (see page 58). For our

main tests though, we showed the

results based on the default

Internode DSLAM profile assigned

to all new customers, to give an

idea of an “out of the box”

experience.

Given the extraordinary

difference in performance at each

line length, you might be

wondering what modem to buy

since you (probably) don’t know

what your home phone’s line

length is. There’s no easy way to

find out, but here’s a hint: before an

ISP connects an ADSL2+ service

they must conduct a Telstra service

qualification (SQ) on your line. This

tells them whether they are allowed

to hook you up for ADSL2+, but

along the way, it tells them detailed

information about your line length,

the thickness/quality of the copper

cable running to your house, and so

on. They may be hesitant to give

the information out but if you can

find a friendly sales consultant they

ADSL2+ speed surprises

TOP 5 at 3.5km

Ranked on actual throughput,

not line sync speed.

TOP 5 at 6km

Ranked on actual throughput,

not line sync speed.

1 OPEN Networks

iConnectAccess624W

(15.17Mbit/s)

=1 Siemens Speedstream

6520 (15.17Mbit/s)

3 Belkin F1PI241EGau (14.96Mbit/s)

4 Billion 7300G (14.89Mbit/s)

5 Linksys WAG54GP2 (14.63Mbit/s)

TOP 5 at 1km

Ranked on actual throughput,

not line sync speed.

1 Billion BIPAC-7300G

(8.78Mbit/s)

2 Cisco 877W (8.53Mbit/s)

3 Billion BIPAC-7404VGP

(8.10Mbit/s)

4 Dynalink RTA1335 (7.07Mbit/s)

5 Dynalink RTA1046VW

(7.07Mbit/s)

Ranked on actual throughput,

not line sync speed.

1 Netgear DG834

(1.90Mbit/s)

=1 LevelOne WBR-3407A

(1.90Mbit/s)

=1 Cisco 877W (1.90Mbit/s)

4 Belkin F1PI241EGau

(1.82Mbit/s)

5 Netcomm NB5Plus4 (1.82Mbit/s)

TOP 5 at 1 & 3.5km

1 Billion 7300G (11.84Mbit/s)

2 Billion 7404VGP (11.36Mbit/s)

3 Siemens Speedstream

6520 (10.97Mbit/s)

4 OPEN Networks iConnectAccess

624W (10.84Mbit/s)

5 Belkin F1PI241EGau

(10.73Mbit/s)

Warnie at Internode HQ

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