Specifications

ISU AT Command Reference Phase IV AT Commands
Iridium Proprietary Version 2.45
20 June 2011 71
when sending a mobile-originated message to the ESS. This value is incremented each time an
SBD session is successfully completed between the ISU to the ESS. This wrap around counter
can range from 0 to 65535.
<MT status>:
The MT status provides an indication of the disposition of the mobile terminated transaction. The
field can take on the following values:
0: No SBD message to receive from the ESS.
1: SBD message successfully received from the ESS.
2: An error occurred while attempting to perform a mailbox check or receive a message
from the ESS.
<MTMSN>:
The Mobile Terminated Message Sequence Number (MTMSN) is assigned by the ESS when
forwarding a message to the ISU. This value is indeterminate if the field <MT status> is zero.
This wrap around counter can range from 0 to 65535.
<MT length>:
The MT length is the length in bytes of the mobile terminated SBD message received from the
ESS. If no message was received, this field will be zero.
<MT queued>:
MT queued is a count of mobile terminated SBD messages waiting at the ESS to be transferred to
the ISU.