Re: tárolós szkóp

[Fuzesi Arnold]

Quick Summary
Auto-negotiation is not 100% reliable, but it does generally work.


Links with a duplex mismatch will operate, but will generate large numbers
of errors, and can slow down busy networks.


For most interfaces, both speed and duplex need to be set to auto for full
auto-negotiation to work.


Forcing a Catalyst switch port to a specific speed disables auto-negotiation
for the duplex setting.


Full-duplex mode can be achieved only if both sides of the link are either
set to auto-negotiate or manually configured to use full-duplex.


Full-duplex will work only if a host is connected directly to a switch or
other device, with no repeaters or hubs in-between.


If auto-negotiation is enabled on only one side of the link, it will always
default to half-duplex, regardless of what the other side of the link is
forced to.


If one side of a link is forced to full duplex and the other is set to
auto-negotiation, a duplex mismatch will occur.


You can force a new auto-negotiation by simply unplugging a host cable for
10 seconds.


Most 10 Mb interfaces can run only in 10Mb half-duplex mode.


Most 10/100 Mb interfaces can do auto-negotiation. Most 10/100 Mb interfaces
with RJ-45 twisted pair jacks can run in full-duplex mode.


Any network connected via an AUI port (with an external transceiver, for
example) can run only in 10Mb half-duplex mode


--
Hát ja... erről ennyit.

Arnold
----- Original Message ----- 
From: "Vajk Fekete" <halaloszto at yahoo.co.uk>
To: <elektro at tesla.hu>
Sent: Monday, May 02, 2005 2:29 PM
Subject: Re: tárolós szkóp


hubazzeg. ilyeneket hol kell olvasni? miota van ilyen az ethernet
szabvanyban? le vagyok maradva...

vajk

Fuzesi Arnold wrote:

>Mivel en sem lattam meg szkopon ezert csak azt
>tudom, hogy ha van egy kutyum, amelyik ezt tudja:
>
>FLP Bursts
>The basis for all of auto-negotiation's functionality is the Fast Link
Pulse
>(FLP)
>burst. An FLP burst is simply a sequence of 10Base-T Normal Link Pulse
>(NLPs,
>also known as Link Test Pulses in 10Base-T world) that come together to
form
>a
>message, or "word". Each FLP is composed of 33 pulse positions, with the 17
>odd
>numbered positions corresponding to clock pulses and the 16 even numbered
>positions corresponding to data pulses. The time between pulse positions is
>62.5
>micro-seconds +/- 7 micro-seconds, and therefore 125 micro-seconds between
>each
>clock pulse.
>All clock positions are required to contain a link pulse. However, data
>positions are
>not. If there is a link pulse present in a data position, it is
>representative of a logic
>one, whereas the lack of a link pulse is representative of a logic zero.
>The amount of time between FLP bursts is 16 micro-seconds +/- 8
>micro-seconds,
>which corresponds to the time between consecutive link test pulses produced
>by a
>10Base-T devices. This was done to allow a fixed speed 10Base-T device to
>see
>FLP bursts and, rather than croaking, remain in the LINK TEST PASS state.
>
>Akkor a halozati eszkoz amit radugtam 10 mbittel (halv vagy full) fog
>beszelgetni, ha ilyen a bitminta:
>
>1000011000000000xxx
>
>Viszont ahogy olvasom eleg erzekeny az idozitesekre...
>
>Szerintem.
>
>Arnold
>----- Original Message ----- 
>From: "Vajk Fekete" <halaloszto at yahoo.co.uk>
>To: <elektro at tesla.hu>
>Sent: Monday, May 02, 2005 1:25 PM
>Subject: Re: tárolós szkóp
>
>
>szereny ismereteim szerint semmilyen.
>
>az ethernet csomag 5 vagy 6 byte (el kellene olvasni megint) 0x55 el
>vagy 0xAA van lezdodik, ami a csatornakodolas szerint asszem 5MHz
>negyszogjel.
>
>ha akar valamit a cucc, akkor ugyis kuldeni fog, es a masik oldal ebbol
>rajon hogy mekkora az orajel. ezert is van, hogy ha a kartya
>autodetectes, es ketto gepet egy crosskabellel osszedugsz, az eletben
>nem fognak beszelni egymassal. mindaketto varja hogy mit akar a masik.
>
>vajk
>
>Fekete Róbert wrote:
>
>
>
>>szia mindenki
>>van é valakinek tárolós szkópja
>>és netán egy 10MBit es hub v swich elfekvőben
>>az érdekelne h milyne bitminta rohan ki belőlle amikor közli h ő biza
>>csak egy 10MBit es jószág
>>
>>
>>FRob
>>
>>www.harden.hu
>>
>>"Minden megoldható legalább egyszer
>>és ha már egyszer megoldható..."
>>-----------------------------------
>>Szponzorunk: http://tonerbolt.hu/
>>
>>
>>
>>
>
>-----------------------------------
> Szponzorunk: http://tonerbolt.hu/
>
>-----------------------------------
> Szponzorunk: http://tonerbolt.hu/
>
>
>
>
-----------------------------------
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