Specifications
Installation and Operation Manual Appendix D Supervision Terminal Commands
FCD-E1LC Ver. 1.0 Commands D-25
Designation Function Values Configuration Guidelines
CRC-4
Enables the generation
and evaluation of check
bits (in accordance with
the CRC-4 polynomial
specified by ITU-T Rec.
G.704)
NO – CRC-4 option disabled.
YES – CRC-4 option enabled.
Default: NO
Select YES, except when the
FCD-E1LC main or sublink is
connected to transmission
equipment that does not
support this option.
SYNC
Used to change the frame
alignment algorithms, to
reduce the time required
for the link to return to
normal operation after
loss of sync
CCITT – Complies with ITU-T Rec.
G.732.
62411 – Complies with AT&T
TR-62411 (after 10 sec.).
FAST – After 1 second.
Default: CCITT
Select CCITT, unless your
application has special
requirements.
RX GAIN
Determines the maximum
attenuation of the receive
signal that can be
compensated for by the
main link receive path, to
obtain the BER
performance required by
the standards
LONG – Maximum attenuation of
36 dB.
SHORT – Maximum attenuation
of 10 dB.
Default: SHORT
The lower attenuation
available with the SHORT
value may actually improve
the performance when
operating over relatively short
line sections, especially when
operating over multi-pair
cables. In such cables,
significant interference is
generated by the signals
carried by other pairs and
therefore, a weak desired
signal may be masked by the
interference.
IDLE_TS_
CODE
Selects the code
transmitted to fill idle
(unused) timeslots in the
main link frame
You can also select any desired
code in the range of 00 to FF
(presented as hexadecimal
numbers).
Default: 3F
Select the value specified for
use on the corresponding link
in your network. Select the
same value at the other end.
FCD-E1LC allows you to select
any two-digit hexadecimal
value.
RAI
Controls the transfer of
the RAI (remote alarm
indication) from the main
link to the optional sublink
ENABLE – The reception of RAI
by the main link interface causes
the FCD-E1LC sub interface to
send RAI to the equipment
connected to the sublink.
DISABLE – The RAI indication
sent by the sublink is not
affected by RAI reception via the
main link.
Default: DISABLE
Select in accordance with the
requirements of your specific
application