[es] - Pomoc oko izbora routera .

tuxserbia
Oleg Vučković
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Re: Pomoc oko izbora routera .

^{24.10.2015. u 14:58 - pre 103 meseci}

Odakle ti 18dbm? Jesi stavljao dd,openWRT? Ja sad gledam uputstvo, i za taj, i za 841, ima klasičan izbor "High-Middle-Low". I nešto ne verujem da bi domet bio bolji, osim što je tvoj max 150, a ovaj max 300Mbit. Drugo, nema ekstra mrežu za goste. Nisam imao vremena da se zezam sa OpenWRT-om.
Ja konkretno držim oba na middle, ovaj u prizemlju ima domet na nekih 30-ak metara ispred kuće.

Malo off
Sad nešto baš gledam, i vidim da CE propisuje max 20dbm, a FCC 30?!? Da li to znači da, ako bih izabrao USA kao zemlju, da bih imao jači signal? Moraću da se poigram s ovim i ja. Gubiš 2 gornja kanala, ali ako je stvarno ovako, onda bi vredelo. Ili ja to potpuno pogrešno kapiram?!? @Mile-Lile HELP

Kako se dele racunarski programi?
Na bagovite (sa greskama) i ispravne (bez gresaka). Ovi drugi su hipoteticki.
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Mile-Lile
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Re: Pomoc oko izbora routera .

^{25.10.2015. u 07:51 - pre 103 meseci}

pa ovo je sad sve off topic ali hajde... nek i moderatori nesto rade:)

1. svaki tp linkov ruter je bolji od 740n (ne znači da je on loš nego je najjeftiniji i namenjen je za nekog kome ne treba nešto posebno, ima mali stan itd)
2. MIMO ruteri uvek imaju bolju "pokrivenost", više antena bolja pokrivenost... recimo da 1043nd V2 (plave boje je) je baš dobar za 2,4 i ima čip koji može do 24dBm...
3. Izborom zemlje možeš povećati tx power ali ne očekuj da će taj 841 ići do 30dBm... ipak je to jeftiniji ruter... ali ako imaš "stock" i nemaš načina to da proveriš jer nigde ne možeš da izlistaš izlaznu snagu...
4. Što bi Peđa Supurović rekao nije sve u snazi:) i to je stvarno istina....
5. Uvek sam za ubacivanje custom firmware ali ne očekujte da će sve uvek raditi i da ćete bez muke sve podesiti... OpenWRT je jako moćan ali nije za početnike jer ako ne poznajete CLI linux
lako možete da se zarobite jer se GUI (web server) instalira kao dodatni paket...
6. Što se tiče flešovanja rutera custom firmware-om lakše je nego stvljanje ROM-a na android.... a svakako da ćete dobiti dodatne funkcije i više tx snage...

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tuxserbia
Oleg Vučković
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Re: Pomoc oko izbora routera .

^{25.10.2015. u 12:07 - pre 103 meseci}

Kako, bre, off?!? Pa sve što je čovek pitao si mu odgovorio.

Za pokrivenost ( u kvadratnim metrima) si naravno u pravu, ali za domet ( u metrima) mislim ( totalno subjektivno, bez merenja) da su tu negde. Ista antena, otprilike ista snaga, čak mi se čini da je 740 malo jači, barem po specifikacijama, nisam imao prilike da ga koristim, skoro isti čip.

Onaj moj off je bilo malo karikiranje poziva u pomoć, ali stvarno nikad nisam primetio da se snaga razlikuje između US i EU. Peđina opaska naravno stoji. Moraću da isprobam, samo da ugrabim malo slobodnog vremena.

A za LuCI i CLI, nekom ne odgovara, dok je meni baš super modularnost, jer negde mi uopšte ne treba direktna interakcija. Sad debelo odoh u off, neću više

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ivmilicevic
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Re: Pomoc oko izbora routera .

^{25.10.2015. u 14:45 - pre 103 meseci}

Jučer popodne sam odnjeo router na servis jer je još uvijek pod garancijom, vidjeti ćemo hoće li je priznati. Inače sam zadovoljan sa 740N, pogotovo jer sam stavio DD-WRT koji ima brdo opcija. Ako ne servisiraju ovaj router, vjerovatno ću kupiti 841N koji bi trebao biti malo bolji od sadašnjeg.

Inače, limit izlazne snage na 740n je 18dBm, barem prema statusu routera. U postavkama postoji opcija ručnog namještanja, ali je 18dbm maksimalna snaga(na regiji Hrvatska, mada sumnjam da to ima utjecaja).

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cobra-11
zeljko antunovic
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Re: Pomoc oko izbora routera .

^{25.10.2015. u 22:12 - pre 103 meseci}

Mile ajde mi objasni nekoliko pojmova u ZyXelu , zasta su i sta odabrati ?

1. Preamble type : long ili short

2. CTS protection : auto , none

3. Aggregation : enable , disable

4. Short GI : enable , disable .

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Mile-Lile
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Re: Pomoc oko izbora routera .

^{26.10.2015. u 07:33 - pre 103 meseci}

Citat:

Short Preamble
If you have 802.11b clients in your network try enabling this, if they have problems connecting or with performance then leave it disabled. Preamble is at the head or front of the PLCP which devices need in order to start transferring data. The long preamble ensure compatibility with legacy 802.11b devices but can slightly reduce throughput at high data rates. The support for short preamble which is reducing the header's size by 50%, down to 9 bytes, is optional for 802.11b. 802.11g and newer all support short preamble, so if you do not have 802.11b devices in your network leave this enabled at all times.

Citat:

Protection Mode
Recommended Setting: None for AP modes, CTS or RTS/CTS for client modes

This setting controls whether the request to send/clear to send 802.11 optional protection mechanism is enabled or disabled. When enabled, an RTS/CTS handshake must be completed before data can be transmitted from clients. Helpful in noisy &/or busy environments, it ensures all clients take turns communicating with the AP, if disabled, packet collisions may occur which causes a drop in throughput & increase in latency due to retransmission overhead. RTS/CTS also helps negate the hidden node problem which occurs when 2 or more clients can each see the AP & vice versa, but the clients can't see eachother, this example is also good to say why RTS/CTS on an AP has no use, since from the AP's point of view, it can already see all connected clients, or they wouldn't be connected in the first place. CTS only is "CTS-to-self" which has less overhead, but is less effective in mitigating the hidden node issue, only other clients within range of the client using CTS only, will hear & honor it while RTS/CTS is the "full option" that gets passed through the AP to all clients, even if the AP has RTS/CTS disabled since RTS/CTS on the AP only applies to when the AP wants to transmit.
RTS/CTS is a setting to experiment with especially on the client mode interface of the router if you are connecting a router to another router, or if you have high error rate or high noise floor (-90 noise is good, -60 is bad) & all other options have failed. Most users should leave this set to the recommended setting above for max performance because the protection mechanism is only enabled automatically when needed, if its off when its needed, your wireless performance can plummet with errors, disconnects & low throughput, & if its no longer needed its turned off automatically on the fly.

Example of an ideal configuration for a client mode router connected to a host router:
Client router with RTS/CTS on (client/client bridge/WDS station) ---> Host router with RTS/CTS off (AP/WDS AP)

3. ne znam šta je ovo. Generalno znam šta je agregacija linka ali očito to nije ovo....

4.

Citat:

Short GI

Recommended Setting: Enable

The standard guard interval used in 802.11 OFDM is 0.8 μs, to increase data rate 802.11n added optional support for a shorter 0.4 μs guard interval which provides about a 10% increase in data rate. The shorter guard interval could (but usually doesn't) result in a higher packet error rate if timing synchronization between the transmitter and receiver is not precise. To reduce complexity, short guard interval is only implemented as a final rate adaptation step when the device is running at its highest data rate such as 72 Mbps, 144 Mbps, 300 Mbps etc, this is by design & not changeable.
Older routers & devices with Atheros AR92XX radios or older only support short GI on HT40 & not HT20, so max HT20 rates are 65 Mbps/130 Mbps/195 Mbps (1x1/2x2/3x3) instead of 72 Mbps/144 Mbps/217 Mbps respectively. Some modern devices such as the Playstation 4 do not like the lack of short GI, & have strange performance problems, sometimes completely crippling the entire network's performance. But the issue may also be related to hardware bugs in the AR92XX chipset, mileage may vary.

_{[Ovu poruku je menjao Mile-Lile dana 26.10.2015. u 08:51 GMT+1]}

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tuxserbia
Oleg Vučković
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Re: Pomoc oko izbora routera .

^{26.10.2015. u 07:59 - pre 103 meseci}

Možda "Frame agregation" ?

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Fabolous
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Re: Pomoc oko izbora routera .

^{26.10.2015. u 08:11 - pre 103 meseci}

Imam kuci tp 841n . Vec 3 mjeseca radi bez problema. Pokrivenos odlicna bez obzira sto mi stoji u cosku..
Moja preporuka za njega necete se pokajati..

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cobra-11
zeljko antunovic
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Re: Pomoc oko izbora routera .

^{26.10.2015. u 17:12 - pre 103 meseci}

Citat:

Mile-Lile:
1.

Citat:

3. ne znam šta je ovo. Generalno znam šta je agregacija linka ali očito to nije ovo....

4.

Citat:

_{[Ovu poruku je menjao Mile-Lile dana 26.10.2015. u 08:51 GMT+1]}

S obzirom se sa ZyXelom kačim kao client na drugi router (oba podesena na 802.11n) ako sam dobro skontao onda staviti :

1. Long preamble
2. CTS auto
3. Aggregation je automatski na enable
4. Enable

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