There are several examples of a telephone network appearing in the MORSE system:
It is used with the Hayes protocol as an alternative to telephone modems and a telephone network.
Direct connection of two PLCs
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/1_1a.gif)
Connection over a telephone network and TM telephone modems
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/1_2a.gif)
Connection over the MORSE network
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/1_3a.gif)
The block CU-MORSE network-CU behaves in the same way as block TM-telephone network-TM and replaces the link between both PLCs. Data is transmitted through the MORSE network in packets as opposed to connection-oriented transmission over the telephone network. For a more detailed description see Hayes protocol for MORSE.
This is used in the case of servicing a CU which is out of reach of a MORSE network.
Direct connection of two CUs
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/2_1a.gif)
Connection over a telephone network and TM telephone modems
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/1_2a.gif)
Service connection of two CUs over a telephone network
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/2_3a.gif)
CUs with MARS-A protocols can communicate this way through telephone modems via a telephone network. This is used occasionally for servicing. The use of a telephone line is not suitable for normal data transmission. For a more detailed description see the MARS-A protocol description, chapter Connection via telephone or GSM modem.
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/3a.gif)
MG100 is a MORSE communication unit which uses a GPRS module in place of a standard radio part. It transmits data over a GSM mobile telephone network. For a more detailed description see GPRS modem MG100.
Connection between PC and CU via a service cable
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/4_1a.gif)
Standard connection between Setr and CU used for configuring the CU.
Connection between PC and remote CU over MORSE network
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/4_2a.gif)
This is used for service access to a remote, unconfigured CU2 via CU1, which is accessible via MORSE routing. A more detailed description is given in chapter Local mode in the MORSE guide.
Connection between PC and remote CU over a telephone network
![](/images/radost/dummy/dummy/../../imag_en/morse/telefon/4_3a.gif)
This is used for service access to a remote, unconfigured CU using
a telephone modem. The remote CU can have default settings, however, the
only necessary parameter is (R)emote dial-up in the MARS-A protocol. For
a more detailed description see the (R)emote dial-up access chapter in
the MARS-A
protocol description.