Faxing Basics

Receiving fax sends what type of signal to specify the units capabilities i.e data rate?

Digital Identification Signal (DIS)

To finish a fax call. What message is sent?

Disconnect (DCN)

What are benefits of FoIP?

1. Lower cost that sending across the PSTN. 2. Eliminate expansive fax board hardware cost 3. Easy to scale fax servers & roll out services to all offices 4. Saving money on power, paper 5. Key component of UC - use fax service from UC client.

What's the process of sending a fax?

1. Sender sends CNG. 2. Receiver sends CED. 3. Receiver sends DIS. 4. Sender sends DCS 4. Sender sends TCF. 5. Receiver sends CFR. 6. Fax page transmission. 7. Sender sends EOP. 8. Receiver sends MCF. 9. Sender sends DCN.

What speed is V.17?

12000bps 14400bps

Fax machine was patented in?

1843 (not widely used until the 1970's)

What speed is V.27ter?

2400bps 4800bps

V.34 can reach a maximum speed of ?

33600bps?

What are protocols are used for the actual fax data transmission?

V.17 (12000bps, 14400bps) V.27 ter (2400bps, 4800bps) V.29 (7200bps, 9600bps) V.34+ (33600bps)

What speed is V.29?

7200bps 9600bps

Receiving fax alerts the sender that it has connected to a fax machine by emitting what tone?

Called Tone (CED)

Sending fax emits what tone when sending a fax?

Calling Tone (CNG) - Alert the recipient that a fax machine is trying to connect.

After receiving fax detects the DCS & after Training Check Message (TCF). The receiving fax sends what type of message to the sending fax to receive the fax document?

Confirmation (CFR)

Sending fax chooses which capabilities are best to match & returns what type of signal?

Digital Command Signal - (DCS)

What's a standard for faxing?

Group 3 (supersedes G1 & G2)

What does Facimile mean?

Latin for 'made alike' , term faxing

What message does the receiving fax acknowledges the EOP signal that the fax was received?

Message Confirmation (MCF)

After the fax document has been sent, the sender sends what type of code & signal indicating there are no more pages to be sent?

Return to Contro (RTC) & End of Procedure (EOP)

What protocol does fax machines use (G3)?

T.30

In the US, who takes care of Telecom standards?

TIA - TR-30 Group

G3 was formed by?

Telegraph & Telephone Consultative Committee (CCITT) - Part of ITU (T.38).

What is a protocol defines the following tones - CNG, CED, DIS, DCS, TCF, CFR, EOP, MCF, DCN?

V.21 (300bps) - handshake signalling, used before & after each page.