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(2) Networking Components

The network configurations illustrated in Figure 2–1 have common components that 
integrate and operate with HSD transceivers.

•

An interface connection to the HSD equipment:

 

The HSD equipment supports the following interface connections: an RS-232 
serial port (MPDS only), a 10BASE-T Ethernet interface on HSD models, 
1110-A-0150 and 1110-A-0160 and available as an option on other models with 
HSD service bulletin, 1110-SB-0004 accomplished, (MPDS or Swift64 Mobile 
ISDN), and an ISDN interface (Swift64 Mobile ISDN only). The Ethernet interface 
is accessed through a direct connection (dedicated network card or crossover 
cable) or through a hub.

•

A session over the HSD equipment:

 

This is the logical link between the server and the ground segment.

•

A connection to other local computers:

 

Connection to other local computers is usually achieved using a hub or router; 
however, the system supports any method computers use to communicate 
between each other (for example: wireless, dial-up).

•

A method of sharing the session with other computers:

 

Session sharing is accomplished using Network Address Translation (NAT)—the 
method behind Internet Connection Sharing, although various proxies may also 
be used.

(3) HSD Interface Options

The HSD has three interface options ("Installation" on page 3-1 provides connection 
details):

(a) ISDN

The ISDN interface supports connections to Swift64 Mobile ISDN services only. 
Computers connect to the ISDN interface through a EURO ISDN S/T BRI 
terminal adapter or router. (Euro ISDN S/T modem and drivers are required.)

(b) Serial Port (RS-232)

The RS-232 port interface supports MPDS services only, and to a single channel 
per physical cable connection.

Connect to the serial port RS-232 interface using a serial cable. (Hardware 
handshaking lines are required: CTS/RTS and DTR/DSR.) On the server 
computer, install a generic external modem with the port set to 115200 bps.

(c) Ethernet 

The Ethernet interface is supported in HSD transceivers, PN 1110-A-0150 and 
1110-A-0160—and HSD transceivers with service bulletin 1110-SB-0004 
accomplished (with Data I/O Type 2 Card installed). HSD-X transceiver 
extensions also support Ethernet.

The Ethernet interface supports both MPDS and M4 circuit-switched data 
(Swift64 Mobile ISDN) services for either single or dual channel systems. It 
supports longer cable lengths to accommodate extension through hubs and other 
networking devices.