TIA/EIA-422-B:1994 (R2014)

This Standard specifies the electrical characteristics of the
balanced voltage digital interface circuit, normally implemented in
integrated circuit technology, that may be employed when specified
for the interchange of serial binary signals between Data Terminal
Equipment (DTE) and Data Circuit-Terminating Equipment (DCE) or in
any point-to-point interconnection of serial binary signals between
digital equipment.

This Standard is compatible with ITU-T (Formally
CCITT) Recommendation V11.

The interface circuit includes a generator connected by a
balanced interconnecting cable to a load consisting of a receiver
or receivers and a termination. The electrical characteristics of
the circuit are specified in terms of required voltage, current,
and resistance values obtained from direct measurements of the
generator and receiver components at the interface points. The
logic function of the generator and the receiver is not defined by
this Standard, as it is application dependent. The receiver
specification for the balanced interface is identical to that
specified for the unbalanced interface circuit in
TIA/EIA-423-B. Minimum performance requirements
for the interconnecting cable are furnished. Guidance is given in
Annex A.l with respect to limitations on data
signal rate imposed by the parameters of the cable length, balance,
and termination, for individual installations.

The parameter values specified for the balanced generator and
load components of the interface are designed such that balanced
interface circuits may be used within the same interconnection as
unbalanced interface circuits specified by
TIA/EIA-423-B. For example, the balanced circuits
may be used for data and timing while the unbalanced circuits may
be used for low speed control functions.

It is intended that this Standard will be referenced by other
standards that specify the complete DTE/DCE
interface (e.g., connector, pin
assignments, function) for applications where the
electrical characteristics of a balanced voltage digital circuit
are required. This Standard does not specify other characteristics
of the DTE/DCE interface (such as signal quality
and timing, etc.) essential for proper operation across the
interface.

When this Standard is referenced by other standards or
specifications, it should be noted that certain options are
available. The preparer of those standards and specifications must
determine and specify those optional features that
are required for that application.