User Manual

DRAFT COPY
NOMAD MXU Administration Manual
3:33 PM 02/12/99
DRAFT COPY
9
2 NOMAD SYSTEM OVERVIEW
2.1 System Description
Figure 2.1-1: NOMAD System
NOMAD System
The NOMAD System consists of the following major subassemblies:
a. Local Public Telephone Switched Network (PSTN):
b. NOMAD Multi-Channel Unit (NOMAD MXU):
c. Optional Control PC: Allows monitoring of the NOMAD system if desired.
d. Constellation of LEO Satellites:
e. Gateway: Controls the Iridium network and the NOMAD System.
f. NOMAD Control PC: Used by the Gateway to control the NOMAD MXU unit.
g. Gateway PSTN: Public Switched telephone network attached to the Gateway
h. Trunk Line: The communications path between the local PSTN and the Gateway PSTN. This
path is used by the Gateway Control PC to initialize and control the NOMAD MXU.
i. Iridium Subscriber Units (NOMAD ISU): Iridium portable handsets/telephones.
The equipment supplied to the user’s site consists of the NOMAD MXU, antenna, mast, wiring and
documentation as indicated by the rectangle in FIGURE 2.1-1. Once the NOMAD MXU is installed per
the instructions in the Administrative and Installation Manuals, the NOMAD system will enable NOMAD
ISU calls (from anywhere within a region defined by the Gateway) to be connected to the local PSTN.
The NOMAD system will provide up to four channels of Iridium based global voice communication
services from a NOMAD ISU to a local PSTN via the NOMAD MXU. The NOMAD MXU attaches to the
local PSTN using four standard, two-wire, analog phone lines and appears as four additional telephones to
the PSTN. The NOMAD MXU connects to the Iridium Constellation via four L-Band Transceivers (LBT)
NOMAD
ISU
RS232
Gateway
PSTN
Satellite
(SV)
NOMAD
MXU
Analog
Phone Lines
Local
PSTN
Modem
GATEWAY
RJ11
110/230VAC
50/60 Hz.
On SIte Installation
Trunkline
Local
Admin or Monitor
PC
Remote
Admin or Monitor
PC
NOMAD
ISU