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RAD
FCD-24
Integrating E1 Multiplexer |
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- The FCD-24 is an
Integrating Multiplexer for E1 and Fractional E1
services. Two or four synchronous data channels and
one E1 sub-link can be connected over the public E1
network, while paying only for the bandwidth
required. The E1 sub-link enables PABX connection to
the E1 interface.
- Four FCD-24 models are
available:
(see Ordering)
FCD-24 with four synchronous data channels;
FCD-24/E1 with four synchronous data channels
and one E1 sub-link;
CD-24-2 with two synchronous data channels;
FCD-24-2/E1 with two synchronous data
channels and one E1 sub-link.
- Data rates are
selectable for any multiple of 64 kbps. Selectable
timeslotting places data into timeslots (DSOs)
either consecutively (bundled), or by
user-definition (without restrictions). Selected
timeslots on the E1 sub-link are bypassed to the
same timeslots on the E1 main link.
- Data channel
interfaces available are V.35, X.21, RS-530 or
V.36/RS-449. (V.36/RS-449 is converted from RS-530
via cables supplied with V.36 interface option - see
Ordering.)
- The FCD-24 is
compatible with virtually all carrier-provided E1
services, meeting all requirements of ITU-T G.703,
G.704 and G.732. It supports 2 or 16 frames per
multiframe, with or without CRC-4. Zero suppression
over the line is HDB3. An optional integral LTU
(Line Termination Unit) supports ranges up to 1.6 km
(1 mile), enabling the FCD-24 to be used as a
multi-channel short range modem for private
applications.
- Multiple clock source
selection allows the E1 main link to be clocked from
the recovered clock (LBT), from the data channel
source, from E1 sub-link, or from an internal
oscillator.
- Data channels may be
set to DCE (FCD-24 provides RX and TX clocks to user
equipment), DTE1 (FCD-24 provides RX clock to user,
while TX clock is received from user) or DTE2 (both
clocks received from user) clocking modes.
- The E1 sub-link
transmit clock is locked to the E1 main link clock.
The receive clock can be used as an external clock
source for the E1 main link transmit clock.
- Setup, control and
monitoring of status and diagnostic information can
be activated from the front panel or via a terminal
or PC connected to the supervisory port.
- Remote line
diagnostics, alarm information, unit configuration
and other control/monitoring information can be
accessed remotely via dial-up modems.
- Maintenance
capabilities include local and remote loopbacks at
various points, as well as built-in BERT for rapid
identification of faults.
- For dial-out
operation, the FCD-24 activates the modem to
automatically dial a pre-programmed number whenever
an alarm event occurs.
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