Protocol States - Avaya MCC1 Maintenance Procedures

Inside the system, data transmission appears in one of two forms:
• Raw digital data, where the physical layer protocols, like DCP, are stripped at the incoming port
and reinserted at the outgoing port.
• Pulse Code Modulation (PCM)-encoded analog signals (analog transmission by a modem), the
signal having been digitized by an analog-to-digital coder/decoder (CODEC) at the incoming
port.
Layer-2 protocols
Layer-2 protocols are given below:
• 8-bit character code — Between the DTE and DCE equipment. Depending on the type of
equipment used, the code can be any proprietary code set.
• Digital multiplexed interface proprietary — Between the originating and the destination DCE.
Family of protocols for digital transmission.
• Voice-grade data — Between the originating and the destination DCE. For analog transmission.

Protocol states

Table 6, Protocol states for data communication,
points in the data transmission stream. See
page 33.
Table 6: Protocol states for data communication
Transmissio
n type
Analog
Digital
1 OSI means Open Systems Interconnect
2 PCM means Pulse Code Modulated
3 DMI means Digital Multiplexed Interface
Maintenance Procedures
December 2003
Figure 3, Intra-port and Inter-port data transmission states,
Incoming
DTE to OSI Protocols DTE to
1
DCE layer DCE
Modem 1 RS-232, RS-449,
or V.35
2 8- or 10-bit code
ADU 1 RS-232
2 Asynchronous 8-
bit code
Data 1 RS-232, RS-449,
Module or V.35
2 8-bit code
Digital 1 Any
Signal
2 8-bit code
Level 1
(DS1)
on page 35 summarizes the protocols used at various
DCE to system
port
analog
Voice-grade
data
ADU
proprietary
Asynchronous
8-bit code
DCP or BRI
3
DMI
DS1
3
DMI or voice-
grade data
Maintenance strategy
Protocols
on
Inside system
2
PCM
Voice-grade data
Raw bits
3
DMI
Raw bits
3
DMI
2
PCM or raw bits
3
DMI or voice-
grade data
35