1) Digital sense multiple access
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Digital Sense Multiple Access
Found on
http://www.encyclo.co.uk/visitor-contributions.php
Digital Sense Multiple Access. Access to a shared uplink radio channel is controlled by sensing a digital flag encoded into a received downlink channel before attempting an access. Since mobiles cannot detect each other's transmissions, CSMA, as used in Ethernet is not feasible. So some downlink bandwidth is sacrificed to send the DSMA flag. Used by radio packet protocols such as CDPD and DataTAC. A more complex variant is the USF (Uplink Status Flag) used to control access to multiple uplink channels in GSM GPRS.
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Found on
http://www.encyclo.co.uk/visitor-contributions.php
No exact match found.
