Avaya Definity SI Maintenance Manual page 49

Protocols
Protocol States
Table 1-4 summarizes the protocols used at various points in the data
transmission stream. See
Table 1-4. Protocol States for Data Communication
Incoming
Transmis- DTE to
sion Type DCE
Analog Modem
ADU
Digital Data
Module
Digital
Signal
Level 1
(DS1)
NOTE:
ADU means Asynchronous Data Unit
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
Table 1-6 on page
Table 1-5. Physical-Layer Protocol Versus Character Code
Protocol
RS-232
RS-449
V.35
555-233-123
Figure 1-1 on page
OSI Protocols DTE to
Layer DCE
1 RS-232, RS-449,
or V.35
2 8- or 10-bit code
1 RS-232
2 asynchronous
8-bit code
1 RS-232, RS-449,
or V.35
2 8-bit code
1 any
2 8-bit code
1-14.
Code
Asynchronous 8-bit ASCII, and synchronous
Asynchronous 8-bit ASCII, and synchronous
Synchronous
1-10.
DCE to System
Port Inside System
analog PCM
voice-grade data voice-grade data
ADU proprietary raw bits
asynchronous DMI
8-bit code
DCP or BRI raw bits
DMI DMI
DS1 PCM or raw bits
DMI or voice- DMI or voice- grade
grade data data
Table 1-5
Issue 4 May 2002
and
1-13