ADTRAN ISU 2x64, User Manual

Page: 57 / 165

Chapter 6. Configuration
61200051L1-1D ISU 2x64 Dual Port ISDN Service Unit User Manual
43
Hang up line command or answered using the Answer Call
command. (These commands are found under the Dial branch of
the menu tree. See Front Panel Dialing Options on page 63.)
Enabled
When Enabled is selected, the incoming call is answered. If that
call is a BONDING call and requires two B channels, the second
call is answered. The port assigned to that second SPID-LDN
pair is disabled during the duration of the BONDING call.
Dump all calls
When Dump all calls is selected, the ISU 2x64 does not accept
any incoming calls. This keeps the line clear for outgoing calls.
Setting Answer Tone
Answer tone is configured separately for both DTE#1 and
DTE#2. Using the front panel, select the appropriate DTE with
either arrow key and press
Enter . (See Figure 6-9.) When using a
VT 100 terminal, select the option number corresponding to the
appropriate DTE and press
Return .
The Answer tone option enables the transmission of a modem
answer tone at the start of voice and audio calls. The purpose of
this tone is to disable echo suppression for echo cancellation on
the circuit in order to get a clear digital circuit. This may be nec-
essary on some long distance circuits. The specifics of the tone
are 4 seconds, 2100 Hz at a -10 dB level with phase reversals
every 475
µ
s.