Lucent Technologies R5SI Manual Do Utilizador
DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Architecture
Page 1-8
Protocols
1
Protocol States
summarizes the protocols used at various points in the data
NOTE:
OSI means Open Systems Interconnect
PCM means Pulse Code Modulated
DMI means Digital Multiplexed Interface
PCM means Pulse Code Modulated
DMI means Digital Multiplexed Interface
Both the physical-layer protocol and the Digital Multiplexed Interface (DMI) mode
used in the connection are dependent upon the type of 8-bit code used at layer 2
between the DTE equipment and DCE equipment, as listed in
used in the connection are dependent upon the type of 8-bit code used at layer 2
between the DTE equipment and DCE equipment, as listed in
and
.
Table 1-1.
Protocol States for Data Communication
Transmiss-
ion Type
Incoming
DTE to
DCE
OSI
Layer
Protocols DTE to
DCE
DCE to System
Port
Inside System
Analog
Modem
1
RS-232, RS-449,
or V.35
or V.35
analog
PCM
2
8- or 10-bit code
voice-grade data
voice-grade data
ADU
1
RS-232
ADU proprietary
raw bits
2
asynchronous
8-bit code
8-bit code
asynchronous
8-bit code
8-bit code
DMI
Digital
Data
Module
Module
1
RS-232, RS-449,
or V.35
or V.35
DCP or BRI
raw bits
2
8-bit code
DMI
DMI
Digital
Signal
Level 1
(DS1)
Signal
Level 1
(DS1)
1
any
DS1
PCM or raw bits
2
8-bit code
DMI or voice-
grade data
grade data
DMI or voice- grade
data
data
Table 1-2.
Physical-Layer Protocol Versus Character Code
Protocol
Code
RS-232
Asynchronous 8-bit ASCII, and synchronous
RS-449
Asynchronous 8-bit ASCII, and synchronous
V.35
Synchronous