Specifications

Appendix D Supervision Terminal Commands Installation and Operation Manual
D-16 Commands FCD-E1LC Ver. 1.0
Parameter Function Values Configuration Guidelines
FIFO_SIZE
Selects the size of
the FIFO buffer used
in the data channel
AUTO – Automatic size
selection in accordance with
the jitter that must be
tolerated at each data rate.
32, 60, 104, 144 – Buffer
size, in bits (corresponds to
FIFO lengths of ±16, ±30, ±52
and ±72 bits).
Default: AUTO
In the DCE and DTE1 timing
modes, it is not necessary to
increase the FIFO size because
the buffer size is automatically
set by FCD-E1LC.
If the DTE2 mode is used and the
jitter expected in your specific
application is higher than what
can be tolerated when using the
automatically selected size, you
can manually select a FIFO size
greater than the AUTO size.
CLOCK MODE
Selects the timing
mode of this user
data channel.
When configuring
channel 2 for an
FCD-E1LC with
Ethernet interface,
only the DCE mode is
supported, and
therefore the timing
clock mode cannot
be changed
DCE – FCD-E1LC data port
operates as a DCE and
provides transmit and receive
clocks to the synchronous
user DTE.
DTE1 – FCD-E1LC data port
supplies the receive clock to
the user equipment and
accepts the user transmit
clock.
DTE2 – FCD-E1LC data port
requires transmit and receive
clocks from the user
equipment.
Default: DCE
Select the timing mode in
accordance with the type of
equipment connected to the user
data channel:
• DCE – For direct connection
to a synchronous DTE.
• DTE1 – For connection via a
modem with external clock or
another equipment that
accepts a receive clock and
outputs a transmit clock.
• DTE2 – For connection via a
modem or other type of
equipment (such as a
multiplexer), that provides
both receive and transmit
clocks. You must select this
mode when FCD-E1LC timing
is to be locked to an external
clock (see CLK MASTER), or
the external clock is intended
for use as a fallback reference
(see CLK FBACK).