User guide

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Chapter 5 - AT Commands
include the TA not being in the @CONFIG menu, not having a data call present at the time,
and Persistent DTR Dialing must be enabled. By default the TA will not delay before dialing
when all conditions are satisfied.
S81: Link Setup Timeout
Usage: S81=n; S81?
Unit: 100ms
Range: n=0—discard pending call,
n=1-255 (100ms-25.5s)
Default: n=30 (3 seconds) for the INS64 switch type
n=10 (1 second) for all other switch types
When all layers are down and no TEIs (Terminal Endpoint Identifiers) are assigned or the
switch dropped the TEIs without informing the TA, then when there is an incoming call or the
TA attempts to originate a call it must first bring up Layer 1, Layer 2, and request a TEI. If for
some reason the switch does not respond to the request for a TEI or none of the layers come
up successfully, then the TA should timeout and report NO CARRIER or NO DIALTONE. By
default S81 allows 3 seconds (INS64 switch type) or 1 second (all other switch types) for the
link to set up. Typically the link is set up within 2 seconds for the INS64 switch type and
200ms for all other switch types.
S84 Data to Terminal Delay
Usage: S84=n; S84?
Unit: 10ms
Range: n=0 (no delay),
n=1-255 (10ms-2.55s)
Default: 0 (no delay)
S84 controls the delay time for data sent from the TA to the terminal. The timer for this S-
register is started at the time the CONNECT message is printed. Any data received from the B-
channel 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, any queued data will be sent to the
terminal in the order in which it was received. This delay timer is useful for use with some
applications that are not ready for to receive data too soon after the CONNECT message is
given.
S85 Data to B-channel Delay
Usage: S85=n; S85?
Unit: 10ms
Range: n=0 (no delay),
n=1-255 (10ms-2.55s)