Maintenance Architecture
555-233-143
1-14
Issue 1 May 2002
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
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
Table 1-3.
Protocol States for Data Communication
Transmission
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
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
asynchronous
8-bit code
DMI
Digital
Data
Module
1
RS-232, RS-449,
or V.35
DCP or BRI
raw bits
2
8-bit code
DMI
DMI
Digital
Signal
Level 1
(DS1)
1
any
DS1
PCM or raw bits
2
8-bit code
DMI or voice-
grade data
DMI or voice- grade
data
Table 1-4.
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
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...