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Synchronous vs Asynchronous
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quantity
Call me Max
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 11-26-00 11:58 PM
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hostile
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I don't know if this is what your referring to, but.....
synchronous is with the use of precise clocking
asynch. (is the opposite), w/o the use of precise clocking.
anybody else?
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11-27-00 12:07 AM
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quantity
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11-27-00 12:18 AM
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aktribes
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11-27-00 12:25 AM
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dmaftei
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quote:
Originally posted by hostile:
synchronous is with the use of precise clocking
Right. On a sync line, a station is allowed to start its transmission on a clock tick (not between ticks).
quote:
asynch. (is the opposite), w/o the use of precise clocking.
Rather, with no clock at all. A station starts transmitting whenever it wants.
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Disclaimer: I do my best to provide accurate information. However, if you take my word for granted, you do so at your own risk! It is always better to double check!
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11-27-00 12:26 AM
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quantity
Call me Max
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Okay, I understand the difference now! Thanks. However, would the majority of connection oriented protocols use synchronous line? Still confused about why we choose synch vs asynch.
Thnaks a bunch
Q
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11-27-00 12:36 AM
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dmaftei
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The "sych/async" and "connection oriented protocols" concepts are unrelated (they're connection-less, so to speak  ).
quote:
Still confused about why we choose synch vs asynch.
Each has its pros and cons. Async must use delimiters to mark the start and end of frames (at the expense of wasted time and bandwidth). Sync must ensure synchronization among stations, which sometimes may be very hard to achieve.
------------------
Disclaimer: I do my best to provide accurate information. However, if you take my word for granted, you do so at your own risk! It is always better to double check!
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11-27-00 12:59 AM
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adilux
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What i read in my notes it says, asyncronous lines are used on networks with different Bandwidths 10Mbps lines and 100Mbps, this requires switches to use Memory buffering.
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11-27-00 01:49 AM
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sids911
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11-27-00 12:10 PM
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adilux
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quote:
Originally posted by sids911:
Can anyone explain why do we use CSU\DSU ?? Does it provide clocking from what i know???
channel service unit/data service unit
A device that performs both the channel service unit (CSU) and data service unit DSU functions. The Channel Service Unit (CSU) is used to terminate a DS1 or DS0 (56/64 kb/s) digital circuit. It peforms line conditioning, protection, loop-back and timing functions. The Data Service Unit (DSU) terminates the data circuit to the Data Terminal Equipment (DTE) and converts the customer's data stream into a bi-polar format for transmission.
works on Layer 1
Basically your modem.
[This message has been edited by adilux (edited 11-27-2000).]
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11-27-00 12:22 PM
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