Unit installation

Installation and Operation Manual Chapter 1 Introduction
FCD-E1 Overview 1-7
• DCE – the FCD-E1 data port provides transmit and receive clock, derived from
the main system clock, for the user’s equipment connected to the data port.
• DTE1 – the FCD-E1 data port sends the receive data accompanied by the
receive clock, derived from the main system clock, to the user’s equipment
connected to the data port, and accepts user’s data according to the user’s
equipment transmit clock.
• DTE2 – FCD-E1 transmits and receives data according to the clock signals
provided by the equipment connected to the data port. When using this
clocking mode, the main link rate must be locked to the clock signal supplied
by the user’s data port interface. The DTE2 mode is not available on channels
with X.21 and Ethernet interfaces.
FCD-E1 provides a FIFO buffer for the data channel, to absorb timing
differences.
FIFO size is generally automatically selected, however in the DTE2 timing
mode, the user can select FIFO size to meet specific system requirements.
Ethernet Port Timing
The timing of the Ethernet processing circuits is always derived from the main
system clock (“DCE” timing). This port cannot be selected as a timing source.
Management
FCD-E1 is designed for unattended operation. The FCD-E1 configuration, that is,
the complete collection of its operating parameters, is determined by a database
stored in non-volatile memory.
The FCD-E1 database management, as well as the other configuration, test, and
monitoring activities (equipment status reading, alarm status and history, activation
of test loops, reading of performance statistics, etc.) can be performed in three ways:
• Supervision Terminal − A “dumb” ASCII terminal connected to an RS-232
port of the FCD-E1 (or a PC running a terminal emulation program), controlled
by the program stored in the FCD-E1, can be used as a supervision terminal.
The terminal can also be connected through a modem link, to enable dial-in
from a remote location. The FCD-E1 supports both point-to-point and
multidrop connections.
• SNMP Management − The SNMP management capability enables fully
graphical, user-friendly management using the RADview network management
stations offered by RAD, as well as management by other SNMP-based
management systems.
• Telnet − Remote management is also possible using the Telnet communication
protocol, which uses TCP/IP communication, without the SNMP service.
Telnet support enables a remote IP host to control the operation of the
FCD-E1 using functions identical to those provided by a supervision terminal.
The communication between the management system and FCD-E1 can take place
out-of-band (by connecting to the serial or Ethernet management ports) or inband
(through the main and/or sublink). FCD-E1 includes a proprietary IP router for
management traffic. This function enables FCD-E1 to transfer management traffic
generated by, or addressed to, other FCD-E1 units, and also inband management