A SERVICE OF

logo

DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Architecture
1-33Protocols
1
Protocol States
Table 1-8 summarizes the protocols used at various points in the data
transmission stream. See Figure 1-9
.
NOTE:
OSI means Open Systems Interconnect
PCM means Pulse Code Modulated
DMI means Digital Multiplexed Interface
Table 1-8. 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
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
28-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