Unit installation

Installation and Operation Manual Chapter 2 Installation and Setup
FCD-E1 Setting the Internal Jumpers and Switches 2-9
Table 2-1. Main Link Jumper and Switch Settings (Cont.)
Function Jumper or
Switch
Description Values (Default value in bold)
Receive Side
Ground Reference
RXGND S1
(1)
The RXGND jumper is used to
control the ground reference
of the main link receive input
when the unbalanced interface
is used.
YES – Receive ground reference
is connected to frame (chassis)
ground.
NO – Receive ground reference
is not connected to the frame
ground. (Balanced interface)
In accordance with ITU-T
recommendations, this jumper
should be set to YES when the
unbalanced interface is used.
Alarm Relay
JP51, JP52 The jumpers JP51 and JP52 are
used to connect the alarm
relay contacts to the rear panel
CONTROL DTE connector.
Both jumpers must always be
set to the same position.
RELAY – The alarm relay
contacts are connected instead
of the DCD and CTS lines in the
CONTROL DTE connector. The
other supervisory port interface
lines in the CONTROL DTE
connector remain connected,
and enable connecting the port
to modem links, but do not
allow polled communication.
DCD, CTS – The alarm relay is
not connected. The CONTROL
DTE connector provides full
functionality.
Push-button
Disable
Jumper PB
DIS JP77
To prevent unauthorized
personnel from using the front
panel pushbuttons, and
possibly disrupting normal
equipment operation, disable
these pushbuttons by
connecting jumper PB DIS
(installing jumper over both
pins).
Connected –The front panel
pushbuttons are disabled.
Disconnected – The front panel
push buttons are enabled, and
can be used to control the
operation of the FCD-E1 (front
panel push buttons control is
enabled).
Clock Polarity
JP10, JP11 The jumpers JP10 and JP11 are
used to enable sampling of
data on the rising edge or
falling edge of the clock. The
jumpers JP10 and JP11 control
the clocks of Channel 1 and
Channel 2, respectively.
NORMAL – Normal operation
(data sampling on the rising
clock edge).
INVERT – Data sampling on the
falling clock edge.