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Page 1–32
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
Note: Activating MPDS on a particular channel card temporarily, disables the ISDN 
port on that channel card while MPDS service is in-use.
For connection to Inmarsat Mobile ISDN services, install an RJ-45 interface connector 
in the cabin area. "Installation" on page 3-1 describes the RJ45 connector and cable 
termination. 
Figure 1–8. ISDN Connection Options
(7) RS-232 Interface 
The simplest configuration, using the RS-232 interface, allows users to connect 
directly to the HSD without any kind of networking device (i.e. router or file server). 
The port identified as DTE-MPDS, on the Interconnect Drawings (refer to "Installation" 
on page 3-1), is a
 serial data port capable of operating up to 115 kbps line speed with 
a maximum throughput of 64 kbps. This RS-232 port only supports Mobile Packet 
Data Service (MPDS).
Install a 9-pin, socket D-Sub interface connector in the cabin area for connection 
to this service. Configure the connection as: 
Bits per second – 115200
Data bits – 8
LAPTOP
(PC)
FAX
(ISDN)
PHONE
(ISDN)
ISDN
BRI S/T
RJ-11
RJ-11
RS232
EURO T/A
(ISDN)
Modem
PCMCIA
CARD
(ISDN)
HSD
Transceiver
COM
EXT. MODEM
(ANALOG)
FAX
(TIP/RING)
PHONE
(TIP/RING)
COM
64K UDI DATA
(MSN 10, 11, 12)
64K
SPEECH
(MSN 40)
3.1K AUDIO
 (MSN 20)
Note: Although several ISDN
DTE  devices may be
connected to an ISDN S/T
Bus, the HSD only supports
one ISDN call at one time
per channel card.
One ISDN S/T Bus per
HSD Transceiver
Channel Card