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UCI, UCI/HS Universal
Interface Converter |
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- UCI is an universal
interface converter, which can interface between any
two data communications products with similar or
different interfaces. UCI is unique in its ability
to operate as an interface converter, a modem
eliminator or an elastic buffer.
- Two models of UCI are
available:
UCI is a standard version, operating at data
rates up to 2.048 Mbps using an external clock, or
up to 512 kbps using the internal clock;
UCI/HS is a high speed version, operating at
data rates up to 2.048 Mbps using internal or
external clock.
- UCI and UCI/HS are
switch-selectable for operation in one of three
modes: interface converter, modem eliminator, and
elestic buffer.
- As an interface
converter (see Figure 1), UCI enables the connection
of a DTE to a DCE with different interfaces,
performing all the physical and electrical
conversions between the two interfaces.
- As a modem eliminator
(see Figure 2), UCI eliminates the need for two
synchronous modems and enables direct connection of
two DTEs which have similar or different interfaces.
UCI provides clocks and performs hand-shaking of
control signals, emulating modem operation.
- As an elastic buffer,
UCI enables the connection of two independently
clocked DCEs. In this mode, UCI provides
bidirectional buffering of data, preventing loss of
data that would otherwise occur due to the
difference in clock phases. The two DCEs can have
similar or different interfaces.
- The modular
construction of UCI allows simple field adaptation.
The unit comprises one main card and two plug-in
interface modules. The main card includes an
internal power supply and central control circuitry.
The available interface modules are V.24/RS-232,
V.35, V.36/RS-449, X.21, G.703 codirectional (64
kbps), G.703 at 1.544 Mbps (unframed) and G.703 at
2.048 (unframed). Interface modules can be mixed,
allowing any combination of interfaces.
- Each interface module
(except G.703 interface) features a DTE/DCE
selection switch). This enhances the universality of
UCI, allowing the unit to operate in various
applications without the need for a cross cable.
- The G.703 1.544 and
2.048 Mbps interfaces provide ITU G.703 line
interface for T1/E1 applications along with line
driver, jitter attenuation and clock recovery
functions. The interface complies with AT&T
62411 (1990 version) Jitter/Synchronizer (Stratum 4,
Type II) requirements. Modulation techniques
supported are unframed B8ZS, HDB3 and AMI.
Transmitter return loss is rated at 14 dB.
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