GTE Omni Si Database Technical Practices Issue 1 Manual

							SVR 5210TL-130500-1001
Removal of an E&M or FX ground-start loop dial channel unit at
the far end causes an incoming seizure to the system. If the
system data base is configured for the trunk circuit as aringdownto the attendant, removal of the far-end channel unit causes an
incoming call to the attendant’s loop. If a channel unit at the CO
channel is equipped with a busy key, operation of the busy key is
equivalent to removing the channel unit from service. The
system can support one 24-channel, Tl-type digital interface.
If 
Tl access is used in the system, a minimum of 12 terminations
per file are assigned for Tl-type carrier access. The physical
location and component height of the 
Tl circuit cards restrict the
use of three universal card slots. 
Tl software addressing
restricts the use of universal card slots 4, 5, and 6. These card
slots normally support 4 turnks each (12 total terminations).
Additional 
Tl-type terminations (up to 24 per file) are assigned
in groups of 4. When 24 (maximum) 
Tl terminations are
assigned, the use of two more universal card slots is also
restricted because of software addressing limitations.
Tl Span29.1 The Tl span is defined as the transmission facility between
the 
Tl interface cards in the system and the channel bank at the
far end. The 
Tl span (Figure 29.1) includes the following:
l An office terminating shelf repeater connected to the 
Tlinterface in the system.
l An office terminating shelf repeater connected to the channel
bank at the far end.
l Regenerative pulse repeaters strategically located at critical
distances within the 
Tl span.
l A two-wire or four-wire interconnecting exchange cable
between all units in the Tl span. Full duplex operation
requires a four-wire exchange cable in the 
Tl span.
The 
Tl span supports Tl carrier transmission. A Tl-typecarrier is a 24-channel, time-division-multiplexed, PCM,
method of transmitting digital or analog data and signaling data
between two devices using standard non-loaded telephone
pairs.
8187S-283 
						

							TL-130500-1001UNIPOLAR BITIS I HtAM
ll---lIl BIPOLARSPAN
OFFICEb INTERFACEFRAMELINECARD- DETECTORCOMPENSATORINGFB-15277-l ACARDCARDORFB-I FB-15280-AIFB-17277-A15278-AIIBIPOLARPCM OUT 8
BITPCM8 BIT
Il-UUI(BIPOLAR)
vc
REMOTEPOWERITlIFRAMING11 1 Tl 11 FAIL
ALARM,1 SUPERVISORYF,1CARD w Li B:%y 11 FB-20718-A 11 FB-17192-A 1IIr-----I-
-----7II
II
III 
IINTERFACE I4,: INTERFACE
r-----------3III
II
II
’ SYSTEM I4ICPUIfI
II
II
L------------J
I.I
I’ NETWORKIL-----------J
Figure 29.2Tl Digital Trunk Interface in the System
NOTES:
l Critical distances between units in the 
Tl span are defined in
TL-130300-1001.l Refer to 342-922-106 for a description of the 9104A Channel
Repeater Line Equipment.
S-2848187SW 5210 
						

							T
SVR 5210TL-130500-10011 Interface29.2 The Tl interface (Figure 29.2) is comparable to the CO-type Siemens Transmissions Systems 91258 FX Channel Unit or
equivalent. Data base programming determines whether the 
Tlinterface responds to ground-start or loop-start signaling. The
interface can be either incoming, outgoing, or two-way
operation. Since the digital interface is transparent, remote
channel units can be either two-wire or four-wire.
NOTE: When the serving end offices use digital switching,
synchronization of the Tl-type lines can be under end office
control where the system functions as a slave. (Refer to 
Tl-type Digital Trunk (paragraph 29.5) for the optional configuration).
A/D (Analog to Digital) and 
D/A (Digital to Analog) conversions
must be made at the other system when connecting a system
configured for Tl carrier operation to another system equipped
for Tl-type carrier lines and routing the data onto an analog
trunk or line at the other system.
Refer to Figure 29.1 for incoming Tl data. The 
Tl interface
receives 
1.544-MHz, bipolar, Tl -type carrier information from
the shelf repeater at the system end of the 
Tl span and performs
the following functions.
o Converts the serial bipolar Tl incoming frames of data into
unipolar serial format.
@ Detects framing synchronization for the 24 time-division-multiplexed channels.
e Detects and removes control signaling and supervisory
information from the PCM signal and forwards these signals to
the system.
e Detects incoming data alarm conditions and forwards alarm
signals to the system.
o Converts the serial unipolar data to eight-bit PCM data.bytesthat represent voice and tone samples.
0 Buffers the eight-bit PCM voice and tone sample data bytes to
circuits that transfer the samples at a 
49.408-MHz rate to the
systems time-switch network.
For outgoing Tl data, the 
Tl interface receives 49.408 MHz,
eight-bit PCM data bytes from the system’s time-switch
network and performs the following functions:
@ Provides buffering for the outgoing PCM data into the Tl
interface.
CD Adds signaling and supervisory information into the outgoing
data.
8187S-285 
						

							TL-130500-1001
l Converts and synchronizes the eight-bit PCM data bytes,
representing voice and tone samples, into serial bipolar frames
of data.
l Outputs the serial bipolar frames of data onto the Tl
connection to the repeater located at the system end of the Tlspan. The 
Tl interface uses time-division-mulitplexing
methods to insert each frame of output data synchronously into
its assigned channel time slot on the multiplexed 24-channel
output to the 
Tl repeater.
The 
Tl interface in the system can operate in the master or slave
clock mode. In the master mode, the system generates the
master 
Tl clock signals for data transmission on the Tl digital
trunk lines. In the slave mode, the clock in the system 
Tlinterface is synchronized to a master clock contained in the 
Tldata stream received from another system device.
Tl Interface29.3 Each Tl type digital interface in the system comprises five
Cardscards which are installed into the system. When these cards are
installed, three universal card slots in the associated equipment
file cannot be used for other applications. The 
Tl interface cards
are defined in Table 29.1.
Table 29.1System Tl Interface Cards
CARD PART NUMBER
CARD NAMEACRONYMFB-17277-A
FB-15277-l A
FB-15278-A
FB-15280-A
FB-17192
FB-20718-1 ASpan Interface (for Master Operation)
Span Interface (for Slave Operation)
Frame Detector
~  Line Compensator
Tl Buffer Card
Tl -Type Supervisory CardSIL
SIL
FDCLCM
Tl B2
TlS
Span Interface29.3.1 The FB-17277 or FB-15277-1A SIL (Span Interface
CardCard) (Figure 29.3) receives and terminates the incoming bipolar
signal, converts it to the incoming unipolar bit stream, and then
extracts the clock frequency from the unipolar stream. The SIL
card converts the outgoing unipolar stream into a bipolar signal
that is compatible with 
Tl-type span signaling. A strapping field
is provided on the card for application configuration during
installation as explained in TL-130300-1001. The span
interface card provides the looping ability to test the digital cards
for framing synchronization.
Each 
FB-15277-1A SIL card has two SINX outputs. Connect
the SIL card to 
SINX 0. For cable lengths, refer to TL-130300-
1001.
8187SVR 5210 
						

							SW 5210USE CABLE
CONNECTOR 0
ONLY FOR S ITL-130500-1001
F
SINX 0
FB-15277-1ASPAN INTERFACE
CARD HANDLE
Figure 29.3FB-15277-1A Span Interface Card Handle
Frame Detector29.3.2 The FB-15278-A FDC (Frame Detector Card) performs
Cardthe following functions:
l Monitors for errors in framing synchronization patterns.
0 Provides a framing alarm signal to the Tl-Type Supervisory
card when three or more bit-pattern errors are detected out of
five incoming synchronization bits examined.
l Provides a signal to the SIL card that indicates a new frame of
voice samples is about to arrive.
0 Indicates when bit 1, the second most significant bit, is to
arrive by providing a signal to the SIL card.
l Provides the supervisory frame signal that decodes channel A
and B signaling.
8187S-287 
						

							TL-130500-1001
Line CompensatorCard
Tl Buffer
Card
Tl -Type
Supervisory
CardMaster Mode
Operation
S-28829.3.3 The FB-15280-A LCM (Line Compensator Module)
card provides buffering to compensate for propagation delay
variations due to changes in temperature of the span line. Two
PCM frames are stored in the buffer on this card. This card
receives the unipolar bit stream from the span interface card.
This 
unipolar stream is received in serial format and converted to
an eight-bit voice sample that is forwarded to the Tl-type
buffer card in parallel format.
29.3.4 The FB-17192 Tl B2 
(Tl-Buffer) card provides a
buffer between the incoming PCM data from the line
compensator card and the digital time-switch network in the
system, and also buffers the outgoing PCM data from the digital
time-switch network to the Span Interface card.
The 
Tl B2 synchronizes and aligns the 24 PCM channels
between the digital network and the 
Tl digital trunk interface.
29.3.5 The FB-20718-l A 
Tl S (Tl -Type Supervisory) card
provides the supervisory signaling interface between the system
and the 
Tl-type interface. The TlS card contains buffers that
retain the status of sense and control points (Figure 29.4).
The 
TlS card has a program board that is strapped to condition
the card to decode FX trunk signaling or E&M trunk signaling.
Strapping is also provided to change from D2 to D3 signaling
format and to provide a variable framing alarm delay time.
Strapping option procedures are described in 
TL-130300-
1001.For alarm conditions, alarm detection processes, and associated
troubleshooting procedures see TL-130200-1001.
29.4 System master mode operation is used for applications
where loss of a data frame is not critical, i.e., when the 
Tl data
link handles analog (voice) transmission. For master mode
operation, the FB-17277-A SIL card (instead of 
FB-15277-
1A) is installed.
When the system operates in the master mode, the far-end
channel banks must be conditioned for loop clock
synchronization. If the far-end channel bank is a Siemens
Transmissions Systems 
90028 PCM channel bank, its Transmit
Common Unit 9’1221 and Terminal Equipment Shelf 91220 must
be modified for applications where the system functions in the
master mode. A modification kit is supplied by FGBS. This
modification kit provides the means whereby the FGBS timing
signal recovered from the received bipolar signal is looped back
to generate the transmit frequency rate. This allows the master
clock in the system to provide looped clock synchronization. In
the master-slave hierarchical timing structure, the system is the
master clock and the channel bank at the far end is the slave.
8187SVR 5210 
						

							TL-130500-1001RED
INDICATORLAMPS
REDINDICATOR 
-LAMPS
‘B-2071 8-A
LOC
0
REM
0
SYS
0
RPF
0
AC0
0
AC0
v
LP
0
LPTLOCAL ALARM (LOC) LAMP THAT LIGHTS WHEN THE FRAMING OF
-THE INCOMING BIPOLAR SIGNAL IS LOST (INDICATES MISFRAMING;
LOSS OF FRAMING SYNCHRONIZATION).
REMOTE ALARM (REM) LAMP THAT LIGHTS WHEN BIT POSITION 2 OF
-THE INCOMING BIPOLAR STREAM IS INHIBITED FOR A PERIOD OF
1.32 TO 1.44 SECONDS.SYSTEM ALARM (SYS) LAMP THAT LIGHTS WHEN ANY ALARM
-CONDITION EXISTS, INCLUDING WHEN THE SYSTEM IS FULLY
FRAME-SYNCHRONIZED BUT IN A LOOP MODE.
REMOTE POWER FAILURE ALARM (RPF) LAMP THAT LIGHTS WHEN A
-POWER FAILURE OCCURS IN THE OFFICE-TERMINATING SHELF.
ALARM CUTOFF (ACO) LAMP THAT INDICATES WHEN THE ALARM
-CUTOFF SWITCH IS ACTIVATED AND THE LOOP TEST SWITCH IS
ACTIVATED.
A TWO-POSITION ALARM CUTOFF (ACO) SWITCH THAT IS 
ACTI--VATED IN THE UP POSITION
LOOP SWITCH (LP) LAMP THAT INDICATES THE LOOP TEST AND
-ALARM CUTOFF SWITCHES ARE ACTIVATED.
A TWO-POSITION LOOP (LP) SWITCH THAT, 
WHEN IN THE UP
POSITION, ALONG WITH THE ALARM CUTOFF SWITCH, ACTIVATES
THE LOOP TEST.
Figure 29.4FB-20718-1A Tl -Type (Tl S) Supervisory Card Handle
SVR 5210
8187S-289 
						

							s-29029.5 System slave mode operation is typically used when theTl data link handles digital data transmissionthat must adhere to
PCM toll communication standards. Present PCM toll
communication standards require a maximum slip rate of one
frame in 20 hours over a particular digital communication link.
The system network clock card 
(FB-20771-1A) does not have
the frequency stability to allow only one frame slip in 20 hours
when the system is operating in the master mode. Therefore, it
is necessary to make the system operate as the slave in the
timing hierarchy when PCM toll communication standards must
be met.
The system can be configured to slave its network clock to a
far-end digital switch by using the FB-20922-A 
INCKS(Synchronized Intermediate Network Clock) card and the 
FB-
15277-1A Tl-Type Span Interface Card (replacing the FB-17277 Span Interface Card). When slaved to another digital
switch, the system derives its network timing from the incoming
Tl -type bipolar digit stream. The FB-15277-l A Span
Interface Card extracts a 
1.544-MHz clock signal from the data
on the Tl-type span.
The derived clock signal is cabled to the FB-17267-A NCWS
card. The synchronizable clock card compares its output to the
input frequency from the 
Tl-type SID card and, by means of a
phase lock loop and a voltage-controlled oscillator,
synchronizes itself to the 
1.544-MHz frequency of the Tl -type
span bit stream. In this mode, the system is then slaved to the
far-end digital switch, which acts as the controlling master
clock.
The clock synchronization hardware on card FB-20922-A
provides for monitoring four external 
1.544-MHz clock signal
inputs (SINXO to SINX3) on the card handle. One of the input
clock signals is selected by the card and used for frequency
synchronization.The clock card remains locked on an input until
it determines that the clock signal has missed a pulse or died
completely. When the 
SINX input that the clock card is locked
onto fails, the card begins scanning the four inputs for a valid
clock input. When it finds 
SINX input, the card will frequency-synchronize onto that 
SINX input.
When the network clock card is not locked onto an external 
Tlclock signal, it free-runs at a pre-fixed frequency. When a
valid input is detected, the FB-20922-A card locks onto the
external clock, cancels its free-running mode, and
resynchronizes to the new input. When the network clock card is
in its free-running mode, the system is synchronized to the
free-running clock frequency. When the network clock card
locks onto an 
SINX Tl input, the system is synchronized to the
Tl input and functions in the slave mode.
8187SVR 5210 
						

							SVR 52108187s-291 
						

							TL-130500-1001Table 29.2Analog Tl Nailed Connections Allowed
FROM
TO
GRD. STARTLOOPE&MLOOP DIDGRD. STARTNo
NoNoNo
LOOP
No
YesYesNo
E&M
LOOP DIDNo
NoYes
NoYes
NoNo
No
1.The supervisory signals must be at least 200 msec in duration.
2.When unlike trunks are connected and any incoming signals are not translatable
to the outgoing type of signal, the signal will be ignored.
SW 5210