Equipment Overview; Hsd-Xi; Escm; Sbb Services - EMS eNfusion 1252-A-4100-01 System Description, Installation And Maintenance Manual

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-X and HSD-Xi High-speed Data Terminal
2.

Equipment Overview

This section briefly describes the HSD-Xi terminal, the ESCM and the SwiftBroadband (SBB)
services supported by the HSD-Xi terminal.
A. HSD-Xi
The HSD-Xi terminal cannot communicate with the satellite network on its own. It extends
the communication functions provided by HSD-440 terminals. The HSD-440 terminal
controls the power available to the HSD-Xi terminal and makes channels available to the
HSD-Xi terminal. The HSD-440 terminal also allocates resources according to the needs
of other equipment in the aircraft, such as communication and safety related equipment.
The HSD-Xi terminal works in conjunction with an HSD-440 terminal to provide one
additional channel of Swift64 services and SBB services.
B. ESCM
The ESCM connects to the HSD-Xi terminal, and contains one standard USIM card that
provides secure subscriber information for billing, and stores the Inmarsat network
parameters that are required for SBB services.
In the ESCM, the microprocessor chip reads the USIM card, and the RS-422 serial
transceiver chip communicates with the channel card in the HSD-Xi terminal.
The ESCM also contains a temperature control system and heating elements because
the operating temperature range of the USM cards is smaller than the HSD-Xi terminal.
When the temperature of the USIM cards is below their operational limit, the ESCM turns
on the heaters and holds the microprocessor chips in reset mode until the USIM cards
reach their operating temperature. SBB services are available after the ESCM has
warmed up and the warm-up time for the ESCM may be up to ten minutes.
If the HSD-Xi detects a fault when it is connected to the ESCM, the HSD-Xi creates an
event log entry.
C. SBB Services
SBB is high-speed satellite communication network to which satellite communication
terminals can connect from any location within view of a satellite. The SBB network and
its terminals enable the simultaneous use of voice and data services.
SBB services are defined by QoS, which assigns a priority to data traffic and guarantees
a certain bandwidth according to that priority. There are two QoSs: streaming IP and
standard IP.

(1) SBB Packet-Switched Services

(a) Streaming IP
Streaming IP service can transfer data at a guaranteed rate of up to 128 Kbps.
Data can be transferred at the rates: 32 kbps, 64 kbps, or 128 kbps streaming
service. The cost of streaming IP services is based on the amount of time the
connection is active.
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