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DMS11.TXT

DMS11.TXT
Posted Jun 7, 1995

DMS-100 Family Docs Part 11

tags | telephony
MD5 | bb320a855fca190af90bf03cfe6fb0c6

DMS11.TXT

Change Mirror Download
NTP
NTP 297-1001-100 PAGE 19
PREL., ISSUE 01D03
79 09 21



10. ABBREVIATIONS


CC - Central Control
CCC - Central Control Complex
CCS - One hundred call seconds per hour
CDM - Customer Data Modifications
CMC - Central Message Controller
CPS - Circuit Pack Storage
CPU - Central Processing Unit
CSM - Channel Supervision Message
CDE - Digital Carrier Equipment
DCM - Digital Carrier Module
DMS - Digital Multiplex System
DNI - Digital Network Interconnecting
DP - Dial Pulse
DS - Data Store
DS1 - Primary digital carrier, 24 channels, 1.544 Mb/sec bit
rate
I/O - Input/Output
IOC - Input/Output Controller
LM - Line Module
LME - Line Module Equipment
LMC - Line Module Controller
MAP - Maintenance and Administration Position
MF - Multifrequency
MFR - Multifrequency receiver
MIS - Miscellaneous Equipment
MS - Message System
MTC - Magnetic Tape Center
NET - Network
NM - Network Module
NMC - Network Message Controller
ODM - Office Data Modification
PCM - Pulse Code Modulated
PDC - Power Distribution Center
PM - Peripheral Module
PP - Peripheral Processor
PROTEL - Procedure Oriented Typoe Enforing Language
PS - Program Store
RAM - Random Access Memory
ROM - Read Only Memory
TM - Trunk Module
TME - Trunk Module Equipment
TTY - Teletype
VDU - Visual Display Unit
VF - Voice Frequency
TDM - Time Divison Multiplex








DMS-100 FAMILY SYSTEM DESCRIPTION
(c) NORTHERN TELECOM LIMITED, 1978


NTP 297-1001-100 PAGE 20
PREL., ISSUE 01D03
79 09 21



TABLE_A


o Frame - Single type of frame for use in the core and
peripheral area

Dimensions: Width 27 in. (686 mm)

Depth 18 in. (457 mm)

Height 84 in. (2.1 m)


o Shelf

Provides 24 in. (610 mm) of usable space between its side plates.

Dimensions: Width 26 in. (660 mm)

Depth 12.5 in. (318 mm)

Height 35.6 cm (14 in.)

o Ambient Temperature (~C)

Normal: 10 to 30~C Extreme: 5 to 49~C

o Relative Humidity

Normal: 20 to 50% Extreme: 20 to 80%

o Power

Nominal: -48 volt battery power plant

Normal: -49 to -53.5 volts

Extreme: -44.75 to -55.8 volts

Note: Extreme conditions may exist for up to 72 hours.
















DMS-100 FAMILY SYSTEM DESCRIPTION
(c) NORTHERN TELECOM LIMITED, 1978


NTP 297-1001-100 PAGE 21
PREL., ISSUE 01D03
79 09 21



TABLE_B


o Call Capacity: 350,000 attempts per Average Busy Season Busy
Hour (ABSBH)

o Reliability: Less than 2 hours downtime in 40 years.

o Grade of
Service Local ABSBH 10_HDBH HDBH*

Dial tone delay >
3 secs 1.5% max 8% 20%

Originating
Matching loss (ML) 1.0% max

Incoming ML 2.0% max

Tandem ML 1.0% 20%


Toll 10HDBH HDBH

Inc. digit
receiver delay 0.5% 2%

Tandem ML 0.5% 2%

* High Day Busy Hour (HDBH)


























DMS-100 FAMILY SYSTEM DESCRIPTION
(c) NORTHERN TELECOM LIMITED, 1978



APPENDIX 1 TO PAGE 1
NTP 297-1001-100
PREL., ISSUE 01D03
79 09 21




CALL DESCRIPTION DMS-100 (INTRA-OFFICE CONNECTION)


1.01 The main components of the DMS switching system and the
means by which they communicate are described in NTP
297-1001-100. The way that these components interact in the
system is described by following an inter-office call (line to
line) from origination to termination. Figures 1 through 5
illustrate the sequence of events in chronological order,
starting at the top of each figure.

1.02 Refer to Figure 1. Each line module (LM) has a Peripheral
Processor (PP), which continually scans the lines in the module
for a change of state. When the PP detects a change of circuit
state indicating an OFF-HOOK, a message is sent via the message
channel to the Central Control (CC) informing it of the event.

1.03 Upon receiving the OFF-HOOK message, the CC assigns a
voice channel on the speech link between the originating LM and
the network and assigns an integrity message to the calling line.
The CC then begins building a message for the calling LM. This
consists of a number of commands, i.e., associate the assigned
voice channel with the calling line, begin sending and checking
integrity, give dial tone, start receiving digits (assume a DP
-dial pulse- origination), and report to the CC after the first
digit. (Integrity is a continuity check message, which is
transmitted over the voice channel. If a discontinuity in
transmission of the integrity message is detected, the connection
is automatically switched over to the other network plane.)

1.04 When the first digit has been reported, the CC determines
the total number of digits required (7 in this case). A message
is then sent to the calling LM to report after 7 digits. When the
digits have been reported, the CC translates the digits to
determine the location of the called line. Upon reception of all
the necessary digits, the CC sends a message to the originating
LM to stop receiving digits.

1.05 Refer to Figure 2. The CC determines the location of the
called line and assigns a voice channel on the speech link bet
called LM and the network. It then sets up a network connection
in both planes between the calling and called LM . A message is
sent to the called LM telling it to stop looking for an OFF-HOOK
on the called line, associate the assigned voice channel, and
begin sending and checking integrity. In case the called LM has
already reported an OFF-HOOK, the CC commands it to disregard the
message.






DMS-100 FAMILY SYSTEM DESCRIPTION
(c) NORTHERN TELECOM LIMITED, 1978



APPENDIX 1 TO PAGE 2
NTP 297-1001-100
PREL., ISSUE 01D03
79 09 21




1.06 When the CC receives a message from both LM indicating
reception of integrity, the CC sends two messages. It sends a
message to the calling LM to start audible ringing and begin
scanning for an ON-HOOK, and a message to the called LM to start
ringing the called line and begin sending the Channel Supervision
Message (CSM) to the calling LM . [The CSM is a digital signal
multiplexed over the voice channel which reflects changes of
state (answer supervision).]

1.07 Refer to Figure 3. When the called line goes OFF-HOOK,
the CSM signal changes state indicating to the calling LM that
the called line has gone OFF-HOOK. The calling LM sends a
message to the CC that the called party has answered. The CC
then sends a message to the called LM to stop ringing the called
line. The two parties are now in the talking state.

1.08 Refer to Figure 4. Suppose the calling line goes ON-HOOK.
The calling LM sends an ON-HOOK message to the CC. The CC
responds with a message to both the calling and the called LM to
stop sending and checking integrity. When the CC receives
messages from both LM indicating that integrity is stopped, the
CC releases the network connection. It then sends a message to
the called LM to release the voice channel and start looking for
an OFF-HOOK after the called party goes ON-HOOK. The same message
is then sent to the calling LM.

1.09 Refer to Figure 5. The disconnect is handled similarly,
when the called line goes ON-HOOK first.

























DMS-100 FAMILY SYSTEM DESCRIPTION
(c) NORTHERN TELECOM LIMITED, 1978



APPENDIX 2 TO PAGE 1
NTP 297-1001-100
PREL., ISSUE 01D03
79 09 21




CALL DESCRIPTION DMS-200 (INTER-OFFICE CONNECTION)


1.01 The main components of the DMS switching system and the
means by which they communicate are described in NTP
297-1001-100. The way that these components interact in the
system is described by following an inter-office trunk connection
from origination to termination. Figures 1 through 4 illustrate
the sequence of events in chronological order, starting at the
top of each figure.

1.02 Refer to Figure 1. Each Trunk Module (TM) has a
Peripheral Processor (PP) which continually scans the trunks in
the module for state changes. When the PP detects a seizure, a
message is sent via the signalling channel to the Central Control
(CC) informing it of the event.

1.03 Upon receiving the seizure message, the CC determines the
trunk group type. Suppose the originating trunk is a
Multifrequency (MF) trunk. The CC then selects an MF receiver
(MFR), assigns an integrity message and voice channels on the
speech links between the MFR TM, and the network, and between the
seized originating trunk TM and the network. The CC establishes
a connection in both network planes between the originating TM
and the TM associated with the MFR (MFR TM). It then sends a
message to both the originating TM and MFR TM to associate the
voice channel and start sending and checking integrity.

1.04 Refer to Figure 2. Once the CC has received
acknowledgement from both TM that they are receiving integrity,
thus ensuring that the network connection is complete, the CC
sends a message to the originating TM to send the start dial
signal to the originating office. The received frequencies from
the originating office are transmitted over the voice channel to
the MFR, where they are translated into digits and stored in the
MFR TM. Upon reception and translation of all the digits the MFR
TM sends the digits via the message channel to the CC. The CC
then sends a message to the originating TM and the MFR TM to stop
sending and checking integrity. Once the TM have responded with
messages indicating that integrity is stopped, the CC releases
the network connection. The CC then sends a message to the MFR
TM to idle the MFR receiver. The CC translates the digits from
the MFR, determines that a terminating trunk is required, and
then finds an idle trunk in a trunk group to the terminating
office.








DMS-100 FAMILY SYSTEM DESCRIPTION
(c) NORTHERN TELECOM LIMITED, 1978



APPENDIX 2 TO PAGE 2
NTP 297-1001-100
PREL., ISSUE 01D03
79 09 21




1.05 Refer to Figure 3. The CC assigns an integrity message,
and assigns a voice channel on the speech link between the
network and the terminating TM. The CC sets up a network
connection through both network planes between the originating
and terminating TM. Two messages are sent, one to the
terminating TM to associate the voice channel, to send and check
integrity, and to send the CSM, the other to the originating TM
to send and check integrity and to look for the CSM. When both
TM respond with messages confirming reception of integrity, the
connection through the office is complete.

1.06 The CC then sends a message to the outgoing TM to send the
seizure message to the far end office and to look for the start
dial signal. When the terminating TM receives the start dial
signal, it sends a message to the CC indicating that it has
received it. The CC responds by sending the necessary digits
over the message channel to the terminating TM.

1.07 Refer to Figure 4. When a disconnect is detected on the
originating trunk, the TM sends a message to the CC. The CC sends
a message to both TM to stop sending and checking integrity. Upon
reception of messages from both TM, indicating that integrity is
stopped, the CC releases the network connection. A message is
then sent to the outgoing TM to idle the outgoing trunk, followed
by a message to the originating TM to idle the originating trunk.




























DMS-100 FAMILY SYSTEM DESCRIPTION
(c) NORTHERN TELECOM LIMITED, 1978



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