Avaya S8700 Maintenance Manual page 38

Maintenance Architecture
Protocol States
Table 1-3 summarizes the protocols used at various points in the data
transmission stream. See
Table 1-3. Protocol States for Data Communication
Incoming
Transmission DTE to
Type DCE
Analog Modem
ADU
Digital Data
Module
Digital
Signal
Level 1
(DS1)
NOTE:
OSI means Open Systems Interconnect
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 and DCE equipment, as listed in
page 1-15.
Table 1-4. Physical-Layer Protocol Versus Character Code
Protocol
RS-232
RS-449
V.35
1-14 Issue 1 May 2002
Figure 1-2 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
Code
Asynchronous 8-bit ASCII, and synchronous
Asynchronous 8-bit ASCII, and synchronous
Synchronous
1-11.
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 1-4 and Table 1-5 on
555-233-143