GTE Omni Si Database Technical Practices Issue 1 Manual

							TL-130500-1001
l Dial tone is transmitted to the subscriber until the first digit is
dialed or timeout occurs.
In addition to transmitting dial tone to the originating subscriber,
the system checks the subscriber’s class of service. Data base
class-of-service tables (resident in system CPU RAM) define
to the system exactly what features are assigned to the
originator’s lineReception of34.2.8 The subscriber recognizes dial tone as a signal to begin
DTMF Digitsdialing the desired number. The CPU prepares to accumulate
and interpret the dialed digits. After the first digit is dialed, the
CPU removes dial tone from the subscriber. The CPU then
writes the address of the special information memory location
that contains quiet code into the subscriber’s control memory,
thereby disconnecting the subscriber from dial tone (Figure 34.5).
The sequence of receiving digits is as follows:
e The subscriber commences to key in the number to be called
on the touch pad of the DTMF telephone. Each number keyed
generates a dual-tone frequency output on the telephone’s tip
and ring input connection into the associated line interface
card.
l The dual-tone frequency from the telephone tip and ring is
converted to digital and is applied to a sample gate output on
the line interface card.
l The Channel Memory card produces binary-coded outputs
which are decoded by the PCMFS card into a discrete
equipment interface select output. This discrete output from
the PCMFS card enables this line interface card sample gate
for approximately 1 microsecond, during which time the 
dual-tone frequency appears on the PCM bus. The output of the
line interface card becomes a series of l-microsecond-wide
digital pulses whose amplitudes vary in step with the 
dual-tone frequency inputs from the telephone.
l This output is routed through the time-switch Nntwork, and
then is applied to the DTMF receiver.
l The fast-scan routine (executed every 10 milliseconds)
sequentially samples for digit collection on all DTMF receiver
channels (time slot) that have been made busy by a 
request-for-service.
o The DTMF receiver output is then applied to the MPB85 card
and the MPB85 card transfers up to eight sense-point status
inputs onto the CPU bus where is it finally applied to the CPU.
During this digit collection routine, the CPU accumulates the
dialed digits via the MPB85 card and executes a digit store
routine (Figure 34.6).
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							TL-130500-1001
l During a digit store routine, the CPU stores each digit in a
scratch pad area of the CPU memory. The digits are stored in
the digit store scratch pad only long enough for the CPU to
identify the station being called (dialed). Then, this information
is transferred to call store for the duration of the call. (The
word format for digit stores and call stores is described in TL-
130200-l 001.)
Reception Of34.2.9 The subscriber recognizes dial tone as a signal to begin
DP Digitsdialing the desired number. The CPU prepares to accumulate
and interpret the dialed digits and, after the first digit is dialed, the
CPU removes dial tone from the subscriber. The CPU then
writes the address of the special information memory location
that contains quiet code into the subscriber’s control memory
thus, disconnecting the subscriber from dial tone. The sequence
for receiving digits is as follows:
l The subscriber commences to rotary dial the number being
called. As the rotary dial returns to the home position, it
makes and breaks the tip and ring connection into the
associated line interface card. Each make and break of the tip
and ring connection creates one DP (Dial Pulse) into the line
interface card. Dialing a one creates one pulse; dialing a nine
creates nine pulses.
l Each tip and ring pulse received by the associated line
interface card enables and disables a sense point output from
a circuit on the line interface card. The dialed pulses cause
the sense point output to vary at an 8 to 12 pulses per second
rate.Note: The line interface card sense point used for DP digits is
the same sense point used to input request-for-service from
a DP telephone (i.e., current flow detected).
l Each time a line interface card is enabled, the level on the
sense point output from the line interface card is applied to the
FB-17215-A MPB85 (Multi-Processor Buffer) card. Each
sense point is enabled (read) for a period of 1 microsecond.
l As well as executing the fast-scan routine every 10
milliseconds, which samples the DP digits, the CPU also
routinely executes the DP digit collection routine for those DP
telephone channels that have requested service and received
dial tone. During the DP digit collection routine, the CPU
counts the pulses and interdigital pauses read from the MPB85
card and routinely transmits the accumulated DP digits to the
system CPU via the MPB85 card.
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							Ringing and
Ringback
SW 521034.2.10 After the CPU has received all the dialed digits, it will
determine who is being called or how the call is to be routed. It
also checks the subscriber’s class of service (line record code
data base tables) to determine if the subscriber is allowed to
make the kind of call dialed. If the call is allowed, for instance
station-to-station, the CPU determines whether or not the
called telephone is busy, sends a 
ringback (or busy) signal tone
to the originating subscriber, and then rings (if not busy) the
telephone being called (Figure 34.7). The follows explaines the
call 
processs:l As the CPU routinely addresses the MPB85 card, it reads the
sense points of equipment interface cards through the MPB85
card. The sense-point bits indicate the status of the
equipment connected to the interface card being scanned.
o If the telephone being called is busy (off-hook), the CPU
writes into the control memory of the originating subscriber’s
time slot the special information memory address that contains
8187s-335 TL-130500-1001
TIME
INTERDIGITQUIET, DTMF TONES
SWITCH
NO. 4 CHANNEL
CONTROL - ACONTROL - I3PAD
INFORMATION
;;aim
3C: FO :
; 9z2vx78 
f D8 f
;///////;i??zy
W//A
78: Da I
%w//A78 
; 07 ;78; -- I
IeY/A40 
IFO i80 1 08 :
y///Av/4
wd
80) D8 ;
wd80 
; 07 ;80 ; -- I
44 
IF0241
Ia#x4
w88 
kO>Dd
m88 
kO>Dd
w
88 ; 37 f
IWm
88 j,‘;;, i
1d, ckt.4 I
50 
f A3 I
!&
Figure 34.5Interdigit and DTMF Tonesl By routinely executing a call store and the associated digit
store routines, the system CPU accumulates the dialed DP
digits by storing the digits in a scratch pad area of system CPU
memory. The digits are stored only long enough for the CPU
to identify the station being called (dialed). (The word format
for digit stores and call stores is described in 
TL-130200-
1001.) 
						

							TL-130500-1001S-336TIME
LAST DIGIT DIALED, DTMF RECEIVER RELEASED
!WITCH
NO. 5 CHANNEL
CONTROL-ACONTROL - BPAD
INFORMATION
;wdAo i&I>D8!
I&
A0 137,071!///////IpriczZ///Iw
IN54
A0 !-- I
Imd
I&Co ’  dial I
I  tone,
; m,Da lquietliterm 1
1md
F8 jga”ti;i
Irn
Figure’34.6Last Digit Dialed, DTMF Receiver Released
Jthe busy signal tone. This action connects the originating
subscriber to the busy signal tone.
l If the telephone being called is not busy, the CPU enters the
time slot assignment routine, and assigns a time slot to the
telephone being called by writing the hardware identification
number of that telephone into the channel memory of the new
time slot (Figure 34.8).
o The CPU now sends a control bit to the equipment interface
card of the telephone being called, causing the telephone to
ring.
@ The CPU now writes into the control memory of the originating
subscriber’s time slot the special information memory address
that contains the 
ringback signal tone.
Answering34.211 When the subscriber being called answers the
a Calltelephone, the system CPU detects the off-hook action. The
system then stops ringing the telephone.
The system CPU also writes into the control memory of the
originating subscriber’s time slot; the information memory
address of the subscriber (called the subscriber’s time slot).
Then the CPU writes into the control memory of the called
subscriber’s time slot; the information memory address of the
8187SVR 5210 
						

							TL-1305QO-1001SVR 5210TIME
SWITCHCALLED TELEPHONE (GROUP A, PCMUS 2, CIRCUIT 6) ASSIGNED TIME SLOT
NO. 6 CHANNELCONTROL -ACONTROL 
- BPAD
INFORMATION
;miM
3C: FOf
;m
70 f D8 !
mpz3
IsmA
78 I Da I78 ; 07 I78; --I
V////A40 
I~0>261
I w//A
80 I Da I
y///h4
80 I Da Iaof 07 I
y///A80 I PCMI
V///AV////AI m/HI;w//9’ lineI44 
I24 iaa I Da I
wmd
aa I Da I
; ckr.6 I
~Y////~
aa I 37 I
kvTz/A
:vm%
1//////A
IV/h
y/maa 1 Pm’ linei
,
C0I  dial II tone,
I  
7559
Da j$&
p?4
Fa :g,“g
Imr(
Figure 34.7Called Telephone Assigned Time SlotTIME
SWITCHORIGINATING TELEPHONE RINGBACK, CALLED TELEPHONE RINGS
No.7CHANNELCONTROL-ACONTROL - B
IwA
Figure 34.8Ringback Sent to Originating Caller
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originating subscriber’s time slot. This action cross-connects
the two time slots so that each is listening to the other.Conversation34.2.12 When the time switch is arranged as shown in Figure
34.9, the two parties can talk to each other, and the two time slots
are in a stable call condition. The time switch (under control of
the 
INCKS card) cycles through a regular scanning routine and
looks at all of the system time slots, one at a time. During each
look. four tasks are executed:
l Channel memory is read to obtain the hardware identification
number (26) of the originating equipment and assigned to this
time slot. A data sample is then taken from the equipment and
placed into the time slot information memory (PCM) voice
circuit.
l Control memory of the originating equipment time slot is read
to obtain the address in memory (88) that the time switch reads
next. It is the information memory address (of some other time
slot) to which the call originator wants to listen.
* Information memory of the distant end time slot is read to
obtain a data sample (PCM voice circuit 4). The data sample
from the distant end time slot is sent to the originating
equipment (26) time slot. Based on the exchange of data
samples, the two parties are able to conduct conversation.
The call remains “stable” until a change in call status occurs
(e.g., one party hangs up or a hookswitch flashes).
l The fourth task involves writing data into channel memory or
control memory. The time switch allocates the last part of its
look at each time slot so that the CPU can write data into
channel memory or control memory. This is only done when
the status of a call is to be changed. (For example, when a
time slot is assigned, the CPU must write a hardware identity
number into channel memory.)
Termination34.2.13 The telephones are placed on-hook when the
of Callconversation has ended, and the following occurs:
l As part of the slow-scan routine, the CPU detects a change in
status of the sense-point status bits related to the station
equipment.
l The CPU then writes idle data (FO) into channel memory of
each time slot (when that time slot is scanned) and then writes
the special information memory address of quiet tone (D8) into
the control memory of each time slot (Figure 34.10).
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							SW 52108187TL-130500-1001
TIME
SWITCHCALLED STATION ANSWERS, CONVERSATION
N0.8 CHANNELCONTROL - ACONTROL - 8PAD
INFORMATION
;mqim;m3c 
I78 f D8 ;
p?zqFO 1
v////5
78; D8 1’ 07I
f9zvz?i
V///d
40; 26 :
I z-w/A80 
:~8>8d
7a /m/5/~
78;-- ;80 
b8>881
IM88 
1~8,801
I %?//A
%V/A
AO: D8 1#WZ///180 
)07>371
m
88; 37 I
W//A
1’///////1
AO; 07 ;3 
DmFigure 34.9 Conversation
TIME
CALLTERMINATED
SWITCHNO. 9 CHANNEL
CONTROL -ACONTROL - BPAD
INFORMATION
i22zyi2zYx44;w4q+zq3c 
I78 i D8 i78; D8 ;78 ; 07 I
yvk-4FO 
’
W//AW//AI W//Ay////578 1--
f40 
126>~0I80 k38>~sl
Iwd80 
188>~4
1ma80 
;37>07[
p//A
w5%l80 
;--i
w
AO; D8 tI///////:AO; 07 ;3 
ImaFigure 34.10 Call Terminated
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							Software
Description
Executive
Class Software
Operating
System
ROM Debugger
Boot ROM
SVR 5210TL-130500-1001
35.0 The software components used to provide the data
system call and interconnect features are divided into the
following categories:
0 Executive class software
l Packet device handler software
e Data call-processing software
l Administration, control, and maintenance software
Software categories are implemented by using the techniques of
compile time switching designed into the program code. All of
the code is memory resident. The CHASM high-level language
is used on all cards, except the ADMP-C card processor. The
ADMP-C card processor is programmed in the language 
“C”.
35.1Executive class software is the core software that operates
the processor based cards used for providing data features for
all 
APMs, SPMs, NICs, UCBs/DCPs, and ADMPs. This software
class contains the OS (Operating System), 
NETLINK, ROMs
debugger, and diagnostics software. The executive class
software performs the following tasks:
0 Initiating and terminating data processes.
l Queuing and de-queuing messages.
l Sending and receiving messages to/from other cards.
l Allocating and deallocating buffer space.
l Providing for software debugging.
0 Carrying out the low-level MPP (Mini-Packet Protocol) link
protocol.
35.2 The operating system is a compile time configurable
software component that services multiple timed and/or 
event-driven tasks on two priority levels. It operates on single 
andiordual 6502 compatible processor systems. The operating system
also services the real-time clock and maintains an 
;ight-bitmultiple scale timer for each task running under its control.
35.3 The ROM debugger executes commands that provide the
following:
* Read/modify memory
l Halt processing
* Single step
l Breakpoint software
l Dump error logs
35.4 Boot ROMs reside 
,311 all RAM-resident cards for the
purpose of downloading their code and tables. This download is
performed at system initialization, system reconfiguration, and
device installation. A common boot ROM is used for the APM,
SPM, and 
UCB/DCP cards. It resides on the A processor. A
boot PROM is used on the ADMP-C processor.
aia7s-341 
						

							TL-130500-1001Netlink35.5 The NETLINK is the software component that provides
intercomponent communications across the packet transport
system and central packet link. It resides, in various forms, on
the APM, SPM, 
UCWDCP, NIC and ADMP cards. NETLINKconsists of three layers:
0 Layer 1 (Physical Layer). This layer provides the software
interface with the packet line interfaces and the packet
transport system hardware.
0 Layer 2 (Mini-Packet Protocol Layer). This layer implements
the link layer protocol. This guarantees sequenced, 
error-free delivery of nontransparent control mini-packet traffic on
each logical link. It also guarantees sequenced, error-free
delivery on nontransparent user mini-packet data traffic.
@ Layer 3 (Message Layer). This layer controls the mini-packet
protocol layer and provides an interface to all higher level
software components for sending and receiving X.25 packets
and data control messages (APM and SPM only).
SuperlinMADMP35.6 SUPERLINK resides on the ADMP and serves as an
interface to transfer messages from 
NETLINK between the ADMP
application tasks on the ADMP-C processor and 
NETLINK orlthe ADMP-A processor. Messages are transferred via inbound
and outbound message transfer lists in the common data area.
The inbound message transfer list is for messages from the C
processor to the A processor, and the outbound message lists is
for messages going in the other direction.
ADMP PECLINK35.7 The ADMP-based PECLINK component receives ADMP-bound messages sent over the PEC bus, validates message
ntegrity, processes assurance responses, and adds all other
valid messages to the PEC-to-ADMP message queue. These
messages are then retrieved and processed by the ADMP
application tasks. Unknown commands are ignored by the
ADMP application task. The PEG-bound messages from the
ADMP application tasks are retrieved from the ADMP-to-PEC
message queue and sent to the 
FZC again via the PEC bus.
PECLINK will act as 
a black box for all PEC-bound messages,
with the exception of he print event and device event messages,
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