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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.
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 |
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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
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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 |
Time Slot Or Time Slot
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
Please Choose A Time Slot
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