Lucent Technologies 555-230-024 User Manual
Digital Interfaces
Issue 5 January 1998
8-5
555-230-024
Digital Communications Protocol
Digital Communications Protocol (DCP), a forerunner of ISDN-Basic Rate Inter-
face, has been the architectural foundation for Lucent Technologies digital serv-
ers and switches. It provides advanced ISDN-like functions by integrating voice
and high-speed data. DCP continues to serve as a key digital interface for
DEFINITY ECS.
face, has been the architectural foundation for Lucent Technologies digital serv-
ers and switches. It provides advanced ISDN-like functions by integrating voice
and high-speed data. DCP continues to serve as a key digital interface for
DEFINITY ECS.
Like ISDN-Basic Rate Interface, DCP defines the communications interface
between a terminal and the switch. It consists of two 64-kbps information (or
bearer) channels and a separate 8-kbps channel for signalling and control infor-
mation (or data channel). Out-of-band signalling via the data channel allows the
information channels to be used for clear-channel transmission.
between a terminal and the switch. It consists of two 64-kbps information (or
bearer) channels and a separate 8-kbps channel for signalling and control infor-
mation (or data channel). Out-of-band signalling via the data channel allows the
information channels to be used for clear-channel transmission.
DCP’s framing structure allows voice, data, and signalling information to be trans-
mitted with low overhead and virtually free of errors. DCP transmits at a rate of
8,000 frames per second or 160 kbps. DCP allows data and digitized voice to be
multiplexed on one or two twisted pairs, terminating in a standard telephone jack.
mitted with low overhead and virtually free of errors. DCP transmits at a rate of
8,000 frames per second or 160 kbps. DCP allows data and digitized voice to be
multiplexed on one or two twisted pairs, terminating in a standard telephone jack.
Digital Multiplexed Interface
DEFINITY ECS supports high-speed, efficient data communications through
Lucent’s Digital Multiplexed Interface. Digital Multiplexed Interface allows com-
munications between a terminal and host computer, between a switch and host
computer, and between two host computers.
Lucent’s Digital Multiplexed Interface. Digital Multiplexed Interface allows com-
munications between a terminal and host computer, between a switch and host
computer, and between two host computers.
Digital Multiplexed Interface is consistent with ISDN-PRI. 24 64-kbps channels
(one of which is reserved for signalling information) transfer data between two
endpoints through the DEFINITY ECS. The multiplexed channels can be sent
over standard Digital Signal Level 1 facilities, allowing the host computer to be
located remotely.
(one of which is reserved for signalling information) transfer data between two
endpoints through the DEFINITY ECS. The multiplexed channels can be sent
over standard Digital Signal Level 1 facilities, allowing the host computer to be
located remotely.
Digital Multiplexed Interface offers two major advantages. It delivers a standard,
single-port interface for linking host computers internally and externally via T1
carrier. And, since it is compatible with ISDN standards and is licensed to numer-
ous equipment manufacturers, it promotes multi-vendor connectivity.
single-port interface for linking host computers internally and externally via T1
carrier. And, since it is compatible with ISDN standards and is licensed to numer-
ous equipment manufacturers, it promotes multi-vendor connectivity.
DEFINITY ECS supports two versions of Digital Multiplexed Interface, each differ-
ing in the way information is carried over the 24th channel:
ing in the way information is carried over the 24th channel:
■
Digital Multiplexed Interface-bit-oriented signalling carries framing and
alarm data and signalling information for connections to host computers
and other vendor equipment.
alarm data and signalling information for connections to host computers
and other vendor equipment.
■
Digital Multiplexed Interface message-oriented signalling, fully compatible
with ISDN-PRI, uses the same message-oriented signalling format, Link
Access Procedure on the D-channel, as ISDN-PRI for control and
signalling. These signalling capabilities extend the advantages of Digital
Multiplexed Interface-Message Oriented Signalling multiplexed
communications to the public ISDN network.
with ISDN-PRI, uses the same message-oriented signalling format, Link
Access Procedure on the D-channel, as ISDN-PRI for control and
signalling. These signalling capabilities extend the advantages of Digital
Multiplexed Interface-Message Oriented Signalling multiplexed
communications to the public ISDN network.