TIA-678-B:2011 (R2014)

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Data Transmission Systems and Equipment – Serial Asynchronous Automatic Dialing and Control for Character Mode DCE on Wireless Data Services

Published By	Publication Date	Number of Pages
TIA	2011	92

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Category: TIA

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Description

This standard is applicable to the interconnection of data
terminal equipment (DTE) and data circuit-terminating equipment
(DCE) employing serial binary data operation via the 100-series
interchange circuits or data operation over equivalent logical
circuits.

This standard specifies extensions to the protocol elements,
procedures, and behaviors described in ITU-T V.250. These
extensions are based on the "+" command prefix and adhere to the
extended command syntax conventions established by ITU-T V.250.

This standard generalizes the protocol elements, procedures, and
behaviors described in ITU-T V.250, making them applicable to DCE
which operate over arbitrary data networks.

This standard defines the commands that the DTE may issue
to:

(1) Interrogate the capabilities of the DCE, including
determination of what data network types and associated
network-specific AT command set extensions are supported by the
DCE;

(2) Select among supported data network types for subsequent DCE
processing of automatic calling and automatic call answering
functions; and,

(3) Select among supported DTE-DCE interface protocols.

This standard defines the responses the DCE shall issue to those
commands. Where possible, these commands and responses are taken
from existing TIA standards.

This standard establishes required mappings between
manufacturer-specific data network services and the DCE protocol
elements, procedures, and behaviors referenced in ITU-T V.250 (e.g.
ring, dial, answer, busy, on-line data state).

This standard establishes conventions for interworking of
network-specific AT command sets in DCE which support multiple data
network types.

This standard establishes a minimal DCE Common AT Command Set
consisting of:

(1) Those commands defined in ITU-T V.250, and

(2) Required extensions using the +W command prefix in
accordance with ITU-T V.250.

This standard establishes conventions for uniform extension of
its own scope and content through Annexes.

Annex D defines optional extensions to the protocol elements,
procedures and behaviors defined in the original standard, based on
+WS and +WC command prefixes reserved for standardized extensions.
The parameters in Annex D only affect operation of the DCE in
Transparent Character Stream mode and in Reliable Transparent
Character Stream mode, as selected by +WS45=0 or by +WS45=1.

Additional information