Northern UTA220/UTA220k - Manual (Page 63)

UTA220/UTA220k
7-3
EIA-366 Dialer Operation
The telephone number can have up to 40 digits, including
special characters. If more than 40 digits are received, the dialer
turns on ACR and waits for CRQ to drop. The characters are
defined as follows:
* and #:
These are used for clarity only.
EON digit:
The EON digit is used when the line is
configured as a nailed-up line. The EON
digit signals that the end of the number has
been received. When it is received, DSC is
turned on. When configured for nail-up
line, it is not necessary to wait for the
connection before turning on DSC.
Other characters defined by EIA-366 are not supported by the
UTA220 dialer. Unsupported characters in a dial string are
ignored by the dialer.
Digit Present (DPR)
DPR is sent by the DTE to indicate to the dialer that the code
on the Digit Signal Circuits can be read. Circuit DPR must not
be turned on before Present Next Digit (PND) comes on. When
DPR is on, it must remain on until PND goes off. When DPR
is off, it must be held off until PND comes on again. If DPR is
not turned on within five seconds after PND is turned on, the
dialer assumes it has received the last digit and dials any digits
that have been received. If no digits have been received, the
dialer turns on Abandon Call and Retry (ACR) and waits for
Call Request (CRQ) to drop.
Present Next Digit (PND)
PND is turned on by the dialer to indicate that it is ready to
accept the next digit on the digit signal circuits NB1, NB2, NB4,
and NB8. Off indicates that the DTE should turn off DPR and
set the states of NB1, NB2, NB4, and NB8 for the next digit.
9 1 0 0 1
* 1 0 1 0
# 1 0 1 1
< (EON) 1 1 0 0
Table 7-2: Dial Digit Character Set (Continued)
Digit NB8 NB4 NB2 NB1