 Figure 60.6 T.30 G3 handshake signal format showing DIS Messages on the transmitted facsimile page NSF covers a wide range of proprietary features but in the ident- ification area it also allows the transmission of passwords for Numeric, alphanumeric or graphical messages held in a transmit confidential operation. memory and sent as part of the facsimile transmission. They are not sent in T.30 format. Because they are facsimile encoded the receive Received copy with typical identification machine remains ignorant of the content and cannot record them in the reports. In addition to the text at the top (date, time and sender identification) The information may contain: transmitted as part of the facsimile image, other information, com- piled at the receiver from the transmitted TSI/NSS and from locally 1. Document number, time and date of sending. available information in the receiver, may be added. 2. Sender's name or TSI. The word 'END' is sometimes inserted at the bottom of the 3. Urgent or priority comment. facsimile image to confirm that this is the last page of the document. Although the implementation may be proprietary to the manufac- ture it is printed on all receivers because it is included in the 60.5 64kbit/s facsimile equipment facsimile message. It is often transmitted outside the regular A4 page increasing the received page length. The availability of switched digital networks with 64kbit/s channels continues to increase with basic rate and primary rate ISDN. The I CCITT NSF signals Series recommendations developed by CCITT have established international standards for 64kbit/s intercommunication Under the non standard facilities procedure a manufacturer may The G3 transmissions use the voice speech band which, when implement any proprietary identification form desired. When trans- converted to PCM digital signals for transmission within the public mitting to another machine of the same manufacturer it may include network, use the complete 64kbit/s channel. This means 9.6kbit/s or alpha as well as nu