User's Manual

Page 2–11
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
T1 and T2 are two-digit identifiers for Inmarsat service types. X1 to X7 can be
any digit between "0" and "9". The IMNs for Mini-M (4.8 kbps LSV) service type
are identified by the T1 and T2 numbers 7 and 6. The IMNs for the 56 kbps and
64 kbps service types (including ISDN Speech and 3.1 kHz audio) are identified
by the T1 and T2 numbers 6 and 0.
(b) Multiple Subscriber Numbers
Multiple Subscriber Numbers (MSNs) act as identification and routing codes for
user devices attached to the HSD system. MSNs identify the device on the
system so that incoming calls route to the appropriate device. Each device must
be assigned an appropriate MSN to identify to the Inmarsat system what type of
service that device needs on outgoing calls. The MSNs also provide routing
information for incoming calls.
For a simplified understanding of MSNs, equate them to telephone extension
numbers (where the IMN is the PBX telephone number and the MSN is the
extension number).
1. Configuring MSNs
Each HSD and HSD-X channel card is assigned one Forward ID and an IMN
for each service type the system is registered for with the service provider.
Table 2–4 provides the list of the MSN numbers recognized by the HSD
system. Both 64 kbps Data and Mini-M Voice (4.8 kbps LSV AMBE) services
support multiple MSNs. The MSNs are assigned to each IMN as follows:
• One MSN for the service types 64 kbps Speech, 3.1 kHz Audio, and 56
kbps Data
• Three MSNs for 64 kbps Data
• Sixteen MSNs for Mini-M Voice (4.8 kbps LSV AMBE)
(On control card software 4.1 or later—systems shipped from the factory
after November 15, 2002 have Version 4.1 software or later installed.)
The three MSNs assigned to 64 kbps ISDN support connection to three
separate devices mapped to the same IMN. Therefore, in dual-channel
systems, three ISDN devices can be connected to each channel provided six
separate mapping extensions; in three-channel systems, three ISDN devices
can be connected to each channel provided nine separate mapping
extensions; and, in four-channel systems, three ISDN devices can be
connected to each channel providing twelve separate mapping extensions.
The sixteen MSNs assigned to 4.8 kbps LSV support the mapping of sixteen
separate phones to the same IMN. (Example: sixteen phones connected to
a PBX box.) In dual and Multi-Channel systems, PBX devices can be
connected to each channel providing up to 64 separate phone extensions.
Note: Incoming voice calls will ring any phone devices not programmed with
an MSN (left blank) including 4.8 kbps LSV, 64 kbps Speech, and 3.1
kHz audio calls.
Configure all devices (e.g. telephones, fax machines, laptops) connected to
the HSD system with an appropriate MSN. (
Refer to the device
manufacturer’s user documentation for specific instructions in how to enter
or configure the MSN.
)