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Questions tagged [duplex]

For questions about duplex on an interface spanning all on topic network devices. For instance, you are troubleshooting an issue where two devices will not negotiate the correct duplex.

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If coaxial is half duplex, how come it's that fast?

I have heard coaxial cables operates in half duplex. If thats the case, how come I get 500 mbps using a cable modem&router? Is the duplex just not that important? Or did I miss something?
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2 answers
54 views

Why is a switch port a collision domain?

I'm just starting my IT education and this is probably a very basic question but I'm having trouble with it. As far as I understand a collision domain is a part of a network where collisions can occur....
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1 answer
56 views

Duplex SFP via one single mode fiber [duplicate]

Is that possible to use duplex SFP which will send and receive signals over only one fiber in backbone? Please refer to the picture. If so, then how the termination of patchcords and backbone's fiber ...
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3 answers
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Does duplex depend on the cable or the interface?

I wanted to know what made a Duplex system work? I always thought it was the Switch that made it work. But I just read on my Cisco course 2 things that made me question it. It said this, and made me ...
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2 votes
2 answers
647 views

Static speed and duplex/no-negotiate causing input error

I noticed gradually increasing input errors for a FastEthernet interface which is connected to an end-user Windows PC. The default setting for all interfaces is no-negotiate. The Foundry switch will ...
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0 votes
1 answer
146 views

Fiber optics connection Duplex vs Simplex [duplicate]

Connecting Fiber optics to Ethernet requires an Media converters However, What i understood is Simplex fiber connection (only one single strand) is for one direction data transfer vs Duplex (dual ...
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4 votes
1 answer
224 views

Confused about single strand Fiber media converter or duplex media converter?

As per Title you may understand my question. I have read many articles about WDM technology as well as Tx/Rx on separate optical fiber. Here my question is which is better in real environment? Any ...
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0 votes
1 answer
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Does Time division duplexing work this way?

During the course of research, I have found a really hard time understanding this short lines below. I will appreciate a short hint or explanation from any expert in this area.
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2 votes
3 answers
884 views

How can 1000BaseT transmit on Rx & receive on Tx pins?

How can 1000-BaseT (Gigabit ethernet twisted copper pairs) technology transmit over the Rx pins & receive over the Tx pins? It's baseband technology (hence the name), right? Discrete digital ...
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2 votes
3 answers
2k views

Can a half duplex communicate with a full duplex device

If I have a full duplex relay, can half-duplex devices effectively communicate with this relay? Also, can interference cancellation be applied to the relays or devices in this case? To be more ...
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7 votes
7 answers
3k views

How LAN works in video games if only one station is permitted to transmit?

I've read the in a LAN the data is transmitted in packets so as to allow only one station to transmit at a given time, so how could this be applied in video games LAN parties if only one device is ...
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1 vote
4 answers
369 views

Can we use two pairs of UTP with hubs?

I understand that hub always supports for half-duplex communication. In that case we should use one out of four UTP pairs. However, I read that for 10BaseT ethernet two pairs of UTP cables are used ...
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5 votes
2 answers
71 views

Better throughput with 100 Mb NIC setting

Ran across something very odd today. Just had a symmetrical 100 Mb circuit installed at a site I’m contracting at. When the NIC is set for auto negotiate for duplex and speed, we only get ~96 Mb down ...
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4 votes
3 answers
332 views

The recommended settings for giga ethernet connected to Ethernet port

What is the recommended duplex and speed configuration for giga ethernet port connected to legacy ethernet (10 mbps) port and there is no available duplex command available on the ethernet side? If ...
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1 vote
1 answer
92 views

Is it possible.. Partial Duplex: 100mb one way & 1000mb the other

I have a potential application where the vast majority of the traffic will be in one direction, and, concurrently, I have a potential alternate use for a pair of wires in the cable that would ...
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1 vote
1 answer
625 views

Full Duplex and Half Duplex Channel Capacity

As far as I know about full and half duplex, if we have a channel with bandwidth 10Mbps then in full duplex both sender and receiver can transfer 10Mb in both directions at the same time and in half ...
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  • 411
3 votes
2 answers
864 views

Full duplex vs. half duplex

My main question is why are hubs always half duplex and layer 2 switches can be full duplex? Because let's say I have a ethernet cable that has pins that can send and receive data at the same time, ...
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6 votes
2 answers
4k views

Full Duplex and Collision Domain

I have a very basic query on Collision Domain and Full Duplex Mode. There are two types of logical topology: Ethernet and Token Ring . Whenever we read about Ethernet the first thing that we are ...
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8 votes
6 answers
23k views

Can a single optical fiber support full-duplex communication?

Can a single-mode single optical fiber support full-duplex communication, or does it have to be two fibers, one for each direction?
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-1 votes
3 answers
11k views

Difference between Half duplex and Full duplex

What is the difference between Half duplex and Full duplex in Transmission mode?
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3 votes
1 answer
221 views

AFDX (Avionics Full-Duplex Switched Ethernet) Mapping

I'm currently learning about AFDX networks and one of the main questions I have is the ability to do a mapping and port scanning of them. My understanding is that it is based on UDP connection using ...
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1 vote
2 answers
132 views

Is it possible to implement full-duplex upper layers over simplex or half-duplex lower layers?

For example, TCP is full duplex. Can it be built on top of non-full-duplex underlying communications?
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1 vote
2 answers
811 views

Multiple access and full/half duplex point-to-point links

In en.wikipedia.org/wiki/Channel_access_method, A channel-access scheme is based on a multiplexing method, that allows several data streams or signals to share the same communication channel or ...
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2 votes
1 answer
70 views

Are the channels mentioned here physical or logical in duplex and multiplex?

https://en.wikipedia.org/wiki/Duplex_(telecommunications) In a half-duplex system, there are still two clearly defined paths/channels, and each party can communicate with the other but not ...
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4 votes
1 answer
98 views

Auto Sensing in Modern Switching Equipment

Ive noticed that Modern switching equipment will auto sense whether it should be DTE or DCE. It will also auto sense whether the line can be in full duplex mode, or if it must be in half duplex. Ive ...
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2 votes
1 answer
155 views

Network load and capacity design - Full Duplex Media?

When calculating the load for a network, Data leaving the pc is always going to be less than the data from the internet and servers. So is it safe to assume that if you work out the load with data ...
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1 vote
2 answers
12k views

Negotiation speed/duplex between a Gigabit ethernet switch or hub and NIC [duplicate]

Please help me on this case: When I connect a NIC manually set to 100 Mbps and Full Duplex to a Gigabit Ethernet port (set to Auto/Auto), what will the result be? Will the Gigabit Ethernet port ...
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4 votes
4 answers
10k views

How is TCP duplex if Ethernet is half-duplex?

If I understand correctly, TCP is a full-duplex birectional protocol. However, Ethernet is half-duplex. Does this mean that eventhough TCP supports full-duplex, it only operates in half-duplex mode ...
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12 votes
2 answers
14k views

Technical difference between a Collision and Broadcast Domain

Many people new to networking wonder what the technical differences between a broadcast domain and a collision domain are. Specifically: What criteria is used to know the boundaries of a collision ...
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3 votes
2 answers
1k views

Full-duplex collisions in wires

I don't know that much in detail how full-duplex works and I wonder if collisions can occur in them. Take a UTP cable for an example - are some cables within it reserved for data going one way and the ...
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2 votes
1 answer
4k views

Full-Duplex and Speed negotiation

I have a server where speed and duplex are set to auto. The NIC supports 1000mb/s, and is connected to my Cisco switch. When I check on port I see that the speed is set to 100Mb/s and Full Duplex. ...
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19 votes
2 answers
25k views

Ethernet autonegotiation differences between (10M | 100M | 1G) Ethernet

I am studying for CCNA and on Wendell Odom's book is said that(regarding autonegotiation): When autonegotiation fails on one node, to choose (half/full-duplex) we must use the rule: If you have a 10/...
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7 votes
4 answers
2k views

discover duplex mismatch interfaces in the network

What are the causes of duplex mismatch other than misconfiguration? (power outage? improper cabling? auto negotiation implementation bugs?) Any thoughts on discovering duplex mismatch? NetMRI seems ...
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