Multitech ISIHI-2S User Manual page 118

Default: 0 (no delay)
S85 controls the delay time for data sent from the TA to the appropriate B-channel. The timer
for this S-register is started at the time the CONNECT message is printed. Any data received
from the terminal after the CONNECT message but before the timer expires is stored in a
queue in the order in which it is received. Once the timer expires, all queued data will be sent
to the appropriate B-channel in the order in which it was received.
S87: En-bloc Analog Call Origination Delay
Usage: S87=n; S87?
Unit: 100ms
Range: n=0-255 (0-25.5s)
Default: 10 (1 second)
S87 allows flexibility of the duration of the time period after a digit is dialed but before an
analog call is sent to the network for processing. S87 is only used when the dialing method is
En-bloc (%A97=0). When a device goes off-hook on the analog port, the TA generates a dial
tone (rather than the network generating a dial tone). Once a digit is dialed, a timer is started.
If another digit is received before the timer reaches the S87 value, then the timer is reset. If the
timer reaches the value determined by S87, then the TA assumes that no more digits are to be
dialed and the TA will send the SETUP message with the dialed number to the network for
processing. By default the TA will not send the SETUP message until 1 second after the last
digit is received from the device.
S89: Modem Ring/Dialtone Information
Usage: S89=n; S89?
Unit: decimal ASCII code
Range: n=0 (standard ring/dialtone),
n=1 (indicates A-law or u-law)
Default: 1 (indicates A-law or u-law)
The ring and dialtone signals sent to the modems indicate various types of information. In the
case of analog calls, they may be used to indicate the type of coding required by the modem to
communicate properly with the remote modem. The type of call may be A-law or u-law and
depends on the switch type. Previous to S89, a standard ring and dialtone were sent to the
modem, in which case the modem would answer or originate the call according to its coding
setting (S108=0 is u-law and S108=1 is A-law for Lucent CSM). S89 was added to bypass the
need to set the type of coding (S108) manually in the modem when receiving or originating
calls. With S89 set to 1 (indicates A-law or u-law), then modem firmware newer than 2.10Q is
required. If a modem call is attempted and the modem does not support the new A-law/u-law
detection, then the modem will print NO DIALTONE when originating a call and it will print a
RING when receiving a call. To resolve this, then set S89=0 on all TA ports. This will cause
the TA to revert to previous ring and dialtone signaling compatible with older modem
firmware (2.06I, 2.09B, and 2.10Q).
Chapter 5 - AT Commands
118