quickly extracted from KNOW.COM...
CSMA/CA
Carrier Sense Multiple Access/Collision Avoidance
(C-S-M-A-C-A)
Network collision detection and resolution technique. A node wishing to
transmit first sends a jamming signal, wait, and then send the data. It
stops if another jamming signal is detected.
CSMA/CD
Carrier Sense Multiple Access/Collision Detection
(C-S-M-A-C-D)
Network collision detection and resolution technique. A node detecting other
traffic on the network stops transmitting, waits a random amount of time,
and then tries again
************************************************************************
Brad Stanfield
Network Engineer
[EMAIL PROTECTED]
Government Micro Resources
Network Operations Control Center
Bldg 33 NAVSEA NCOE
757-393-9526
-----Original Message-----
From: Kent [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, July 18, 2000 10:50 AM
To: Stanfield Hilman B(Brad) CONT NNSY; 'Luong, David'; 'Cisco Group
Study'
Subject: RE: Deferred Packets
Can you guys tell me what is the difference between CD
and CA? Detection and Avoidance?
Thanks
Kent
--- "Stanfield Hilman B(Brad) CONT NNSY"
<[EMAIL PROTECTED]> wrote:
> 802.3 uses CSMA/CD *BUT* 802.11 (wireless ETHERNET)
> uses CSMA/CA so, in the
> truest sense YES, it IS possible for Ethernet media
> to deploy both. Just not
> simultaneously.
>
>
************************************************************************
> Brad Stanfield
> Network Engineer
> [EMAIL PROTECTED]
> Government Micro Resources
> Network Operations Control Center
> Bldg 33 NAVSEA NCOE
> 757-393-9526
>
>
>
> -----Original Message-----
> From: Luong, David [mailto:[EMAIL PROTECTED]]
> Sent: Monday, July 17, 2000 5:19 PM
> To: '[EMAIL PROTECTED]'; 'Cisco Group Study'
> Subject: RE: Deferred Packets
>
>
> Further to your response, a fellow co-worker of mind
> has mentioned that
> ethernet used CSMA/CD 802.3 instead of CA? Is it
> possible for ethernet media
> to deploy both? I have not come across this
> before....any takers out there?
>
> Dave.
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]
> Sent: Monday, July 17, 2000 12:40 PM
> To: Luong, David
> Subject: Re: Deferred Packets
>
>
>
>
> Deferred packets are a normal part of an ethernet
> transmission.
>
> If multiple hosts attempt to transmit over the same
> ethernet media at the
> same
> time, a collision occurs. After a specified period
> of time, both packets
> involved in the collision are lost and must be
> retransmitted by the
> transmitting
> hosts. Ethernet interfaces employ
> collision-avoidance methods to detect
> other
> traffic on the network and await opportunities for
> safe transmission,this is
> also known as ethernet deference.
>
> Hope this helps.
>
>
>
>
>
>
>
>
> "Luong, David" <[EMAIL PROTECTED]> on 07/17/2000
> 01:37:57 PM
>
> Please respond to "Luong, David"
> <[EMAIL PROTECTED]>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> To: "'Cisco Group Study'"
> <[EMAIL PROTECTED]>
>
>
> cc: (bcc: LOMBMML Hill
> Michale/Lincoln/Metromail)
>
>
>
>
>
>
> Subject: Deferred Packets
>
>
>
>
>
>
>
>
>
>
> Hi Folks:
>
> On a 10-half ethernet connection between two
> routers, we are seeing deferred
> packets happening as well as the normal usual
> collisions. Are deferred
> packets just normal as well? Is it expected in
> ethernet media? Thanks in
> advance...
>
> David Luong
> CCNP,CCNA,Network+,A+,i-Net+
> Telecommunications Analyst
> Insurance Corporation of B.C.
> Vancouver, B.C CANADA
>
>
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