In a facsimile system, buffer underflow is prevented by forcing the transmit pointer to wait at a current end-of-line (EOL) symbol and transmit fill bits until there are at least two EOL symbols stored in the buffer. Buffer overflow is controlled by selectively dropping lines if the write pointer approaches...http://www.google.se/patents/US6456399?utm_source=gb-gplus-sharePatent US6456399 - Buffer overflow and underflow control for facsimile transmission
