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 Multip lexed 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 co de DMI
Digital Data
Module 1 RS-232, RS-449,
or V.35 DCP or BRI raw bits
28-bit code DMI DMI
Digital Sig nal Level 1
(DS1)
1 any DS1 PCM or raw bits
2 8-bit code DMI or voice-
grade dat a DMI or voic e- grade
data