Unit installation

Chapter 3 Operation Installation and Operation Manual
3-8 Configuration Alternatives FCD-E1
Connecting Supervision Terminals
Supervision terminals are supported through the front-panel CONTROL DCE port.
CONTROL DCE ports are located on all the FCD-E1 versions, and have standard
RS-232 asynchronous interfaces.
The supervision terminals can be connected either directly to the FCD-E1 system
CONTROL DCE port, or through a modem link (for convenience, the term modem
link is also used to represent any other type of full-duplex data link).
CONTROL DCE Port Interface Characteristics
The CONTROL DCE port supports the following data rates: 300, 1200, 2400,
4800, 9600 or 19200 bps. The word format consists of one start bit, 7 or 8 data
bits, and one stop bit. Parity can be odd, even or disabled. Always make sure the
communication interfaces of the equipment (terminal, modem, etc.) connected to
the CONTROL DCE port and the port itself are configured for operation with the
same parameters.
To simplify the establishment of communication, the CONTROL DCE port
supports the AUTOBAUD function. When this function is enabled, the FCD-E1
system can identify the data rate of the signal received at the CONTROL DCE port
by analyzing the timing of three consecutive Carriage Return + Line Feed
characters (generated by pressing three times the <Enter> key). The detected
data rate is then used for the current communication session.
Direct Connection to CONTROL DCE Port
The CONTROL DCE port enables direct connection to terminals. Usually,
terminals have DTE interfaces, therefore in this case the connection of the terminal
to the CONTROL DCE port is made by means of a straight cable (a cable wired
point-to-point).
Connection to CONTROL DCE Port through a Modem Link
The CONTROL DCE port also supports the connection of a remote supervision
terminal through a modem link.
The CONTROL DCE port supports only dial-in, that is, it cannot dial out.
For connection to a modem, you need a cross cable (also called null modem
cable). Appendix A presents wiring information for various types of cables.
Two types of modems are supported:
• Dial-up Hayes compatible modems, e.g., the RAD miniature DLM/AT
modem.
• Multidrop modems, e.g., the RAD SRM-6 miniature multidrop modem.
Multidrop connections are explained in the following section.
Multidrop Connections
You may use a multidrop configuration to connect the supervisory ports of several
FCD-E1 system units to a common supervision terminal using multidrop modems
or digital sharing devices.
Note