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Questions tagged [ieee-802.3x]

For questions about 802.3x Ethernet Flow Control (PAUSE frames).

2
votes
1answer
18 views

Does the dot3StatsInternalMacReceiveErrors counter include Vlan mismatches

I am wondering if the dot3StatsInternalMacReceiveErrors counter includes VLAN mismatches, i.e. Discards due to VLAN mismatch. http://oid-info.com/get/1.3.6.1.2.1.10.7.2.1.16 only explicitly lists ...
1
vote
2answers
59 views

Going from 100BaseTX to 1000BaseT

How can this happen? Cables are the same (cat 5) so what needs to be done in order to go from 100Mbps to 1000Mbps?
2
votes
1answer
30 views

Collision detection on 100Base-T4

Access methods are used when computers share a common medium 100Base-T4 is star based Why "the fourth pair is used for collision detection"?,when talking about the 100Base-T4 standard?
13
votes
5answers
3k views

How exactly does an Ethernet collision happen in the cable, since nodes use different circuits for Tx and Rx?

I am trying to understand how a collision occurs in Ethernet, especially when a duplex mismatch exists or when on a legacy Ethernet network two nodes transmit simultaneously. Everyone explains the ...
0
votes
1answer
54 views

How 1gbe works in full duplex? [duplicate]

1gb Ethernet works in full duplex and the maximum theoretical throughput is 2Gbps. Every pair gives 250 mbps in both directions. How it can work in full duplex on the one pair?
2
votes
1answer
55 views

can single Ethernet mac handle two RJ45 ports?

I have two RJ45 ports and one Ethernet MAC can i interface them without using the switch. it has to be used in my final year engineering project
1
vote
2answers
408 views

Is CSMA/CA used in Wifi technology?

I understand that these days CSMA/CD i.e. ethernet one isn't used at all because we have full duplex network. Thus, there is no chance of collision here. Also, we don't use hubs anymore. Each switch ...
1
vote
1answer
88 views

Compatibility of CentreCom Transceiver 210TS 10BaseT Ethernet with modern Ethernet

I have two old legacy system communicating each other using CentreCom 210TS 10BaseT Ethernet Transceiver. The Transceivers are connected to AUI port of system. SQE test is disable on both transceiver. ...
4
votes
3answers
180 views

Where are UTP cable speeds defined for Ethernet?

I have consulted several Network+ exam preparation books, Network+ practice exam questions, the IEEE 802.3-2015 standard, and several older TIA-568 standards. However, I'm having trouble finding a ...
1
vote
2answers
259 views

How links come up, when an autoneg disabled FE port is connected to Autoneg enabled 10/100/1G port

I was just learning about auto-negotiation and got some doubts. As per the standard 802.3 clause 28, 10BASE-T ports transmits LIT or NLP pulses to make the link UP. https://en.wikipedia.org/wiki/...
1
vote
1answer
60 views

sleeping computer on gigabit ethernet kills multicast performance

Problem: any sleeping computer on a gigabit network causes all multicast traffic to drop to 10Mbps. Solution: provide customers with managed gigabit switches and train them to configure the switches ...
3
votes
1answer
2k views

Why does IEEE 802.3 have both minimum and maximum frame sizes? [duplicate]

The ethernet IEEE 802.3 standard defines the minimum Ethernet frame size as 64 bytes, and the maximum frame size as 1518 bytes. Why is There a Minimum and Maximum Ethernet Frame size? For example: ...
0
votes
1answer
18k views

Cisco ISR 4431 Router GigabitEthernet Flow-control Disable

I've got a new Cisco ISR 4431 Router running IOS XE 03.13.02.S and IOS 15.4(3)S2. WAN connection is a Metro Ethernet circuit delivered over copper and ISP has requested that we force the port to 1Gbps ...
1
vote
1answer
217 views

How the frame size getting below 64 bytes

I did packet capture on my system, where i did packet capture on wireless adapter. i seen some frame size below than 64 bytes like 54 bytes and other frame size as well. I seen some document frame ...