User's Manual

Page 1–25
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
The 24-bit Forward ID strap pins, available on the ARINC 600 connector, form
part of the Inmarsat serial number (ISN). The ISN consists of the type approval
number and the Fwd ID address. Each Forward ID is associated with Inmarsat
Mobile Numbers (IMN), which are the numbers that a user would dial from the
ground to reach the terminal on an aircraft. There is a unique IMN for each of
the service types (e.g. Swift64 ISDN 64 kbps data).
When strapping the Forward ID on the HSD-128, the first number in the Forward
ID pair is used. The HSD-128 internally identifies the second Forward ID by
looking up a table in its memory. It is important to strap the first number; otherwise,
the HSD-128 will not be able to correctly look up the second number.
For strapping the Forward ID on the HSD-X in a four-channel configuration,
although each HSD-X can use either number in the second pair, typically the first
number of the second pair is assigned to the first HSD-X and the second number
of the second pair to the second HSD-X.
Figure 1–1 illustrates the assignment
of Forward IDs in a 3-channel system. Figure 1–2 illustrates the assignment of
Forward IDs in a 4-channel system.
Note: The placeholder for the Forward ID in the following illustrations uses
“xxxxxx” to represent the six-digit hex number of a valid Forward ID.
Uppercase “X’s” indicate a strapped Forward ID address.
Figure 1–1. Forward ID Assignment (3-channel system)
Figure 1–2. Forward ID Assignment (4-channel system)
XXXXXX
xxxxxx
XXXXXX
xxxxxx
HSD-128
HSD-X 1
First Forward ID pair
(one for each channel card)
Second Forward ID pair
(Second Forward ID of pair is
not used)
XXXXXX
xxxxxx
XXXXXX
XXXXXX
HSD-128
HSD-X 1
HSD-X 2
First Forward ID pair
(one for each channel card)
Second Forward ID pair
(one for each HSD-X)