ATT System 25 Reference Manual

FUNCTIONAL DESCRIPTION
Figure 3-21.System Software Partitioning
3-40 

FUNCTIONAL DESCRIPTION
Memory
Administration and Feature Code Modules, which includes Station Call Processing, are
software tasks associated with memory.Each task controls the storage and movement of
data and messages between elements in the system.
l Administration
Provides for administration of station and system features. This software also
supports maintenance procedures related to error checking and diagnosing trouble.
l Feature Code Modules
Includes the software that receives and sends data to/from...

FUNCTIONAL DESCRIPTION
l Operating System (OS)
Controls all message and data flow to/from memory, to the Arch Angel Driver
Interface, to the microprocessors on the port circuit packs, and to the RS-232 driver
interfaces. Messages destined for a particular task are queued until the associated
task can receive them. When a task has completed a particular process, the next
message is obtained from the message queue of the tasks. The OS provides an
interval timer that is used to time tasks.Processes that...

FUNCTIONAL DESCRIPTION
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
The OS checks a message directory to determine which task (i.e., software module)
is to receive the message.
A function of the OS referred to as the “transformer”
determines it has a message for the Station Call Processing task and queues the
message in RAM.
The Station Call Processing task retrieves its message and interprets it as a call
origination. The task determines whether there is an idle call appearance button
(System Access...

FUNCTIONAL DESCRIPTION
18. When either of the parties hangs up, the associated port circuit controller sends an
up-link message to the Station Call Processing task.
19. Station Call Processing interprets the on-hook message as the end of the call.
20. The task then sends a down-link message to the port circuit pack controllers to
disconnect the time slot connections and turn off the LEDs associated with the calls.
3-44 

HARDWARE DESCRIPTION
System Cabinets (J58901A1 L4)
Cabinet 1 (Control and Port Circuits)
Cabinets 2 and 3 (Port Circuits)
Cabinet Address Plug4-1
4-4
4-4
4-6
Circuit Packs
Required Circuit Packs
Optional Circuit Packs
Station Port Circuit Packs
Trunk Port Circuit Packs
System Resource Circuit Packs
Circuit Pack Compatibility
Circuit Pack Features
4-7
4-8
4-9
4-9
4-11
4-12
4-13
4-13
Terminal Equipment
Voice Terminals
Single-Line Voice Terminals
500 Series
2500 Series
2526BMWG Voice Terminal
7101A Voice...

7313H01A Voice Terminal (BIS-10) (PEC 3165-10B)                       4-38
7314H01A Voice Terminal (BIS-22) (PEC 3166-22B)                      4-40
7316H01A Voice Terminal (BIS-34) (PEC 3167-34B)                    4-42
7317H01A Voice Terminal (BIS-34D) (PEC 3167-DSB)                    4-44
10-Button MET Set (2991C/D05)                            4-46
10-Button MET Set With Built-In Speakerphone (2993C04)                        4-48
12-Button MET Set (7203M)                                        4-50...

ADU Connections                           4-68
Auxiliary Equipment Connections                                              4-68
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Figures
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Figure 4-25.
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Figure 4-28.
Figure 4-29.
Figure 4-30.System 25 Cabinets (J58901A)—3-Cabinet System                   4-3
System Cabinet (J58901A)—Rear View...

Figure 4-31.Out-of-Building 7300H Series Multiline Voice Terminal Connections  -
4-72
Figure 4-32.MET Set Connections                                     4-73
Figure 4-33.
Stand-Alone Remotely Powered Multiline Voice Terminal and ATL
Cordless Telephone Connections                                  4-74
Figure 4-34.Typical ADU Connections—
Supporting Data Terminal and Single-
LineVoiceTerminal                                                 4-75
Figure 4-35.Typical ADU Connections—
Supporting Data Terminal...