|
FEATURES
The FCD-20 is a rate and interface converter for
connecting E1
(2.048 Mbps) equipment to a high speed public data service that provides
V.35 or X.21 link at any n x 64 kbps data rate.
The FCD-20 connects equipment providing fractional
E1 (in which only some of the timeslots are being used) to data channels
in which the data rate is lower than the E1 rate.
The FCD-20 keeps the fractional E1 data channelized
(i.e., the exact placement of data into timeslots is maintained end-to-end).
This unique feature allows connection of both multiplexers and single
channel equipment to the data service.
Channelization integrity is maintained by allocating 8
kbps for synchronization between the two FCD-20s. The remaining 56 kbps in
the synchronization timeslot can be used either for user data channel or for
downline loading of parameters to the remote unit. The channelized E1
interface is compatible with CCITT recommendations G.703, G.704 and G.732.
Two models are available:
with V.35 link interface or with X.21 link interface. Both models provide
setup and control from the front panel.
Data from the E1 multiplexer is decoded in one of two
selectable methods: either as a bundle of several consecutive timeslots or
in a free, user-defined timeslot allocation.
The E1 transmit clock is locked to the V.35 or X.21
trunk timing of the data service network. The E1 multiplexer should operate
in loopback timing mode, or with its own timing, if it is accurate enough to
prevent excessive frame slips and loss of data.
Maintenance and diagnostics capabilities include local
and remote loopbacks at various points.
SPECIFICATIONS
- Connects E1 (CEPT) equipment to digital data
services
- Connects two PABXs through digital data services
- Maintains fractional E1 (CEPT) integrity end-to-end
- Link interface: V.35 or X.21
- Front panel setup and control
- Complies with CCITT recommendations G.703, G.704
and G.732
- Selectable E1 framing format: two or sixteen frames
per multiframe
- Downline loading of configuration to remote sites
FCD-20/+/#
E1 Rate and Interface Converter
+ Specify:
V35 for V.35 link interface
X21 for X.21 link interface
# Specify:
115 for 115 volts supply
230 for 230 volts supply
(Default is 230 volts supply)
RM-3
Hardware for mounting one unit onto a 19" rack
ORDERING
FCD-20/V35/115
FCD-20/V35/230
FCD-20/X21/115
FCD-20/X21/230
APPLICATION
Four Channels Transferred End-to-end
through Data-service
|
