Error codes consist of six hexadecimal digits (0–5).

Digit 5 (far left): TX or RX

TX:

1xxxxx

RX:

2xxxxx

Internet Fax TX:

3xxxxx

Internet Fax RX:

4xxxxx

Digit 4: Coding (MH/MR/MMR/JBIG)

MH:

x1xxxx

MR:

x2xxxx

MMR:

x3xxxx

JBIG:

x4xxxx

Digit 3: Modem mode

V27ter nonECM

xx1xxx

V29 nonECM

xx2xxx

V17 nonECM

xx3xxx

V33 nonECM

xx4xxx

V34

xx5xxx

V27ter ECM

xx9xxx

V29 ECM

xxaxxx

V17 ECM

xxbxxx

V33 ECM

xxcxxx

Digit 2: Modem speed

2400

xxx1xx

4800

xxx2xx

7200

xxx3xx

9600

xxx4xx

12000

xxx5xx

14400

xxx6xx

16800

xxx7xx

19200

xxx8xx

21600

xxx9xx

24000

xxxaxx

26400

xxxbxx

28800

xxxcxx

31200

xxxdxx

33600

xxxexx

Digits 1-0 are assigned to indicate detailed error descriptions.