Specifications

Simrad MS50 – Chapter 1. Introduction 1.9

To make an outgoing call, you use a standard international telephone

number with the 00 prefix. The mobile automatically includes informa-

tion to identify the MES and the particular port that originates the call.

Simrad MS50 has four ports configured for: display handset, tele-

phone, telefax and data.

The LES uses the port identifying information (OI) for billing purposes.

The mobile transmits the dialing information on a channel specially

assigned by the NCS, to the LES, which also has been instructed to

tune to the same channel. LES routes the call over the public tele-

communications networks to the intended destination. When the

called party responds, the call proceeds.

Calls to Mobiles

The Simrad MS50 terminal receives incoming calls via the IMN phone

numbers. IMN numbers are assigned to the following ports:

• Display Handset (HS port)

• Telephone (TEL port)

• Data service (DATA port)

• Telefax service (FAX port)

• NIMS service

Calls are made as ordinary international (Satellite) calls where each

Ocean Region has an international country code. If an area is cov-

ered by more than one satellite, it is necessary that the caller knows

which satellite (Ocean Region) the mobile is tuned to, or if not known

try the other satellite(s).

The international codes to the four Ocean Regions are as follows:

• Atlantic Ocean East Region: 871

• Pacific Ocean Region: 872

• Indian Ocean Region: 873

• Atlantic Ocean West Region: 874

Note! Some Net service providers support the common Ocean Re-

gion access no. 870, which connects the call to the dialed Simrad

MS50 regardless of the Ocean Region the user currently communi-

cates through.

Services

• Telephone calls – basic telephony services.

• Telefax – CCITT Group 3 facsimile services, 2.4 kbps.

• Data communication – Hayes compatible 2.4 kbps data service.

• Mail service – NIMS

System description cont’d