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Slot time is a concept in computer networking. It is at least twice the time it takes for an electronic pulse (OSILayer 1 - Physical) to travel the length of the maximum theoretical distance between two nodes. In CSMA/CD networks such as Ethernet, the slot time is an upper limit on the acquisition of the medium, a limit on the length of a packet fragment generated by a collision, and the scheduling quantum for retransmission.[1]
Since a pulse's runtime will never exceed slot time (the maximum theoretical time for a frame to travel a network), the network interface controller, or NIC waits a minimum of slot time before retransmitting after a collision happened, in order to allow any pulse that was initiated at the time that the waiting NIC was requested to send, to reach all other nodes. By allowing the pulse to reach the waiting NIC, a local collision occurs (i.e. while still sending) rather than a late collision occurring (after sending may or may not have ended). By having the collision occur at the NIC (local) and not on the wire (late) CSMA/CD implementation recover the situation by retransmitting later.
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Some times for Ethernet slot time include:[2]
| Speed | Slot time[3] | Time Interval |
|---|---|---|
| 10 Mbit/s | 512 bit times | 51.2 microseconds |
| 100 Mbit/s | 512 bit times | 5.12 microseconds |
| 1 Gbit/s[4] | 4096 bit times | 4.096 microseconds |
| 2.5 Gbit/s onward | no half-duplex operation | |
See DIFS for information on 802.11x slot times.
References[edit]
- ^IEEE 802.3 4.2.3.2.3 Collision handling
- ^IEEE 802.3 4.4.2 MAC parameters
- ^Slot time is only applicable to half-duplex transmissions. Since slot time is the time required to wait for the medium to be free from transmissions, there is no time required to wait for full-duplex transmissions. 1 Gbit/s (in practice) and faster (by standard) are full duplex technologies, so slot time is not applicable here.
- ^theoretical, only full-duplex devices exist
hangs when I create a node on one machine which specifies a hub on a
different machine. After I run the command to start the node, I check
the grid/console webpage of my hub and it displays that it is
listening to my node momentarily. Upon refresh, it says (cannot rbe
reached at the moment). Creating a node on the same machine as the hub
works fine. I run the test case anyways (the hub is not listening to
nodes that are on the same machine) and here is the output. I tried
variations of nodes and hubs using standalone 2.2.0 and 2.1.0, and it
all seems to be the same problem. It seems to have know about the node
somehow because, if I run the node, it will hang, and eventually in
the hub's URL/grid/console webpage it say that the node cannot be
reached. However, if I kill the node, and rerun the same command
(using the same port I previously tried using with the node), in the
hub's terminal, it prints a warning saying:
WARNING: Proxy 'URL :htttp://192.168.10.1:7773/wd/hub time out :
300000' was previously registered. Cleaning up any stale test
sessions.
Thanks for the help in advanced!
-Daniel
On Jul 27, 11:30 pm, Krishnan Mahadevan
<krishnan.mahadevan1...@gmail.com> wrote:> garcia.pared...@gmail.com> wrote:
> Javier, if the node is not available, I have seen the Grid throw back an
> error saying capability not present. I havent seen it wait.
>
> If the capability matching is indeed the problem, then you have a couple of
> options.
>
> 1. Spawn the webdriver node that is hooked to the hub with a nodeConfig file
> (u have to use the -nodeConfig parameter) and define capabilities such that
> the grid can redirect the request to the node.
> 2. Revisit your code, get away from using DesiredCapabilities c =
> DesiredCapabilities.internetExplorer() and instead use the following
>
> DesiredCapabilities c = new DesiredCapabilities();
> c.setBrowserName(DesiredCapabilites.internetExplore().getBrowserName());
>
> and then retry. Hope that helps.
>
> Thanks & Regards
> Krishnan Mahadevan
>
> 'All the desirable things in life are either illegal, expensive, fattening
> or in love with someone else!'
>
> On Wed, Jul 27, 2011 at 11:47 AM, Javier Garcia Paredero <
>
>
>
>
>
>
>
> > Yes. Actually if i open in the browserhttp://localhost:4444/grid/consoleIcan see the following
>> > - {platform=WINDOWS, ensureCleanSession=true, browserName=internet
> > 1 requests waiting for a slot to be free.
>
> > explorer, version=9}> >> On Tue, Jul 26, 2011 at 8:34 AM, Javier Garcia <garcia.pared...@gmail.com
>
> > Looks like it cannot find the node
>
> > 2011/7/26 Eric Bass <3m8...@gmail.com>
>
> >> are you running the code below on the same machine that the hub is on? if
> >> not you should replace localhost with either the hostname or the IP address
> >> of the hub server.
>
> >> > wrote:> >>> hubhttp://10.128.24.28:4444/grid/register-port 5556 -browser
>
> >>> Hi
>
> >>> I am trying to test using Grid2. I have an ie9 browser in a Windows7
> >>> VM
>
> >>> First i start the hub
> >>> java -jar selenium-server-standalone-2.2.0 -role hub
>
> >>> In the remote host i register the node
> >>> java -jar selenium-server-standalone-2.2.0.jar -role webdriver -