Справочник Пользователя для EMS Technologies Canada Ltd. HSD-X
Page 2–48
18 September 2007
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
1. Terminal Adapters—ISDN Modem
Terminal adapters are ISDN devices that function similarly to a modem; they
dial and answer calls, and receive and transmit data. They are also referred
to as TA’s, ISDN cards, or ISDN modems.
dial and answer calls, and receive and transmit data. They are also referred
to as TA’s, ISDN cards, or ISDN modems.
Note:
The HSD works with Euro S/T ISDN terminal adapters. Inmarsat
Swift64 Mobile ISDN service and the HSD do not support the North
American ISDN variant.
Swift64 Mobile ISDN service and the HSD do not support the North
American ISDN variant.
2. ISDN Protocols
Terminal adapters use ISDN protocols to format data between the ISDN line
and the user’s computer.
and the user’s computer.
The HSD supports most ISDN protocols that run over a B channel on an ISDN
line; however, it does not actually implement any of these protocols. The
operating system of the user’s computer implements the protocols.
line; however, it does not actually implement any of these protocols. The
operating system of the user’s computer implements the protocols.
3. ISDN Line
This ISDN satellite link acts similarly to ISDN landline providing the same
service, but it supports only a single B channel and emulates the D channel.
service, but it supports only a single B channel and emulates the D channel.
The B channel transmits data the same as an ISDN landline; it sends data at
64 kbps with full duplex. The MES translates the 16 kbps D Channel into an
Inmarsat Mobile ISDN signaling system.
64 kbps with full duplex. The MES translates the 16 kbps D Channel into an
Inmarsat Mobile ISDN signaling system.
Despite the differences between landline ISDN and the Inmarsat Mobile ISDN
link, most ISDN applications run successfully over the Inmarsat network.
link, most ISDN applications run successfully over the Inmarsat network.
(b) Using the Ethernet Interface for Inmarsat Mobile ISDN
HSD transceivers with a Data I/O Type 2 Card (PNs 1110-A-0150, 1110-A-0160
and HSD transceivers with service bulletin 1110-SB-0004 accomplished) and all
HSD-X transceiver extensions support the
and HSD transceivers with service bulletin 1110-SB-0004 accomplished) and all
HSD-X transceiver extensions support the
Ethernet interface.
The basic requirements for using the HSD Ethernet interface to access Swift64
Mobile ISDN services over the satellite network are listed below:
Mobile ISDN services over the satellite network are listed below:
•
A PPPoE compatible router—optional devices (e.g. routers) must be PPPoE
compatible
compatible
•
An account with an Inmarsat Service Provider
•
A computer with PPPoE driver installed—a PPPoE driver is the protocol most
commonly used by Digital Subscriber Line (DSL) devices; it establishes the
connection of the session and the exchanges of PPP frames over Ethernet.
commonly used by Digital Subscriber Line (DSL) devices; it establishes the
connection of the session and the exchanges of PPP frames over Ethernet.
•
Dial-up Networking capabilities
(3) Connecting to Inmarsat MPDS
The connection requirements for MPDS service over the satellite network differ
depending on whether you access the system through an Asynchronous Serial
(RS-232) or Ethernet (10BASE-T) physical connection.
depending on whether you access the system through an Asynchronous Serial
(RS-232) or Ethernet (10BASE-T) physical connection.
(a) Using the RS-232 Interface
To make an MPDS connection using the HSD RS-232 port requires the following: