User's Manual

UL-801 Installation Manual
Page 24
23-20-06 15 December 2011
N. SatCom-based Airborne Telephony (TEL)
A dedicated standard telephone modem is designed into UniLink. This modem is used to
transfer data between a supported ground station and the aircraft subsystems. For example,
the airborne telephone modem is initially used for uploading messages, text weather, and
graphical weather data from a DSP via a dial-up connection. UniLink manages only one
RS-232 port for this use.
SatCom-based Airborne Telephony is supported by Iridium and Inmarsat systems that
include an integral air phone modem which UniLink accesses via an RS-232 interface. The
airborne telephony modem uploads messages, text weather, and graphical weather from a
DSP.
It is important to note that the UniLink does not support the MagnaStar Digital Airborne
Telephone System and the UASC Aero-I. There is no UniLink tip and ring interface as was
the case with previous UL-60X/70X products. However, the legacy use of the word TEL,
which is used to abbreviate telephony, remains unchanged and continues to indicate the use
of a configured RS-232 UniLink port in support of such systems.
If TEL is configured to be used in the priority rotation, the request is then routed to an
available SatCom system via a configured RS-232 port.
The available options for RS-232-capable air phone configurations are UASC T-T Aero-M
or Iridium. The Iridium selection supports a variety of RS-232 available Iridium SatCom
products.
The UniLink Telephony Communications Status is displayed on the COMM STATUS page
and is explained in the following table.