| The FCD-14 is an
integrating multiplexer for Fractional T1 services. Up
to four synchronous data channels and one T1 sub link
can be connected over the public T1 network, while
paying only for the bandwidth required. The T1 sub link
enables PABX connection to the T1 interface.
Three models are
available:
FCD-14 - four
synchronous data channels
FCD-14/T1 - four
synchronous data channels and one T1 sub link
FCD-14-2/T1 - two
synchronous data channels and one T1 sub link.
Data rates are selectable
for any multiple of 56 or 64 kbps. Selectable
timeslotting places data into timeslots (DS0s) either
consecutively, alternately or user-defined without
restriction. Selected timeslots on the T1 sub link are
bypassed to the T1 main link on the same timeslots.
Channel interface is
available as V.35, RS-530 or X.21. Adapter cables from
RS-530 to RS-449 should be ordered separately (see
Ordering).
The FCD-14 is compatible
with virtually all carrier-provided T1 services,
including ASDS from AT&T, and meets all TR-62411
requirements. It supports both D4 and ESF framed
formats. Zero suppression over the T1 link is selectable
for either Transparent, B7ZS or B8ZS. The integral CSU
supports a range of up to 1.6 km (1 mile).
Multiple clock source
selection allows the T1 main link to be clocked from the
recovered clock (LBT), from the channel (or T1 sub link)
source, or from an internal oscillator. Data channels
may be set to DTE, DCE with external transmit clock, or
DCE, where both receive and transmit clocks are inputs.
The T1 sub link transmit
clock is locked to the T1 main link clock. Receive clock
can be used as an external clock source for the T1 main
link transmit clock.
Set-up, control and
monitoring of status and diagnostic information can be
activated from the front panel or via a supervisory port
connected to a terminal or PC.
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 for
rapid identification of faults. When in ESF format, T1
main link statistics are stored in memory in compliance
with both ANSI and AT&T versions. This information
may be retrieved by the service supplier, or by the user
through the supervisory port.
For dial-out operation,
the FCD-14 automatically dials a pre-programmed number
whenever an alarm event occurs.
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