Toshiba Perception E Ex Digital Pbx Installation And Maintenance Manual

							AlTACHMENT A 
Tl/DS-1 INTERFACE 
The DS-1 interface operates at the rate of 1.544 
Mbps. This rate is obtained by either one of the 
following two methods: 
METHOD 1: 
l Rate of each channel (time slot) = 64 kbps 
l 64 kbps * 24 channels = 1.536 Mbps 
l Rate required for synchronization = 8 kbps 
l DS-1 rate = 1.536 Mbps + 8 kbps = 1.544 Mbps 
METHOD 2: 
l 8 bits per channel * 24 channels = 192 bits 
l 1 bit for frame synchronization 
l Total bits in one frame = 193 bits 
l DS-1 rate = 193 bits * 8000 sampling rate per 
second = 1.544 Mbps 
In order to provide the above capabilities, 
PERCEPTIONe,e, Tl/DS-1 digital trunk interface 
shall comply with the requirements defined by the 
industry for DS-1 service. The specified require- 
Tl/DS-1 
SEPTEMBER i&j 
ments are shown in the following paragraphs. 
DS-1 Service Requirements 
Physical Interface: The physical interface must 
comply with the defined specification for Tl/DS-I 
frame and signaling format, pulse density restric- 
tion, and electrical characteristics. 
Frame and Signaling Format: As mentioned in 
Method 2, the DS-1 frame format consists of 24 8- 
bit words and one framing bit for synchronization, 
which yields 193 bits per frame. The frames are 
grouped into multiframes. These multiframes are 
referred to as Super-frame (see Figure 1). 
Superframe Grouping Format: Super-frame can 
be grouped in two ways: 
1) Twelve frames per Super-frame (SF). This 
grouping is known as the D3/D4 Framing 
Format. 
l In this arrangement the framing bit is used 
only for synchronization. 
l The synchronization identifies the begin- 
ning of the Super-frame and the signaling 
I 
1 FRAME 
I 
Y 
125 MICROSECONDS w 
I 
193 BITS I 
, I 
FRAMING BIT 
(1 BIT) 
FIGURE l-FRAME ASSEMBLY  
						

							PERCEPTIONea,, 
Tl/DS-1 
SEPTEMBER 1991 
frames within the Super-frame. 
l The identification is done by verifying the 
Terminal Framing (FT) bit sequence 
“101010” (odd frames) and the Signaling 
Framing (FS) bit sequence “001110” (even 
frames). (See Figure 2.) 
2) Twenty-four frames per Super-frame. This 
grouping is known as the Extended Super- 
frame (ESF). 
l In this arrangement the framing bit is time 
multiplexed to support three functions, 
namely, Synchronization, Cyclic Redun- 
dancy Check (CRC), and Facility Data Link 
(FDL). 
Signaling Protocol: The DS-1 interface is com- 
patible with two types of signaling protocol: cant bit of each time slot in every sixth frame 
(sixth and twelfth) is robbed for signaling pur- 
poses. The signaling in ESF is closely similar 
to the one in SF, but the former contains the A, 
B, C, and D signal bits which occur in the sixth, 
twelfth, eighteenth, and twenty-fourth frames. 
To provide compatibility between SF and ESF 
framing format, the A, B, C, and D bits are 
used in a manner that C = A and D = B. 
2) Common Channel Signaling: The Common 
Channel Signaling is also called the Bit Ori- 
ented Signaling (BOS). This type of signaling 
is mainly used in Digital Multiplexed Interface 
(DMI) applications. In this protocol, the first 23 
bits are used for data processing, while the 
last bit is used for signaling. 
1) Channel Associated Signaling: The DS-1 
signaling must be compatible with both the A 
and B bit signaling protocol of Channel Asso- 
ciated Signaling (CAS), used by a D4 type 
channel bank. In this protocol, the least signifi- Pulse Density Restriction: Since regenerative 
repeaters are used in the transmission facility, a 
restriction on the transmission of data has been 
imposed upon. This restriction is designed to pre- 
vent a clock recovery failure (due to an excessive 
number of “ZEROS”) from happening. The restric- 
n SUPERFRAME _I FRAME FRAME 
FRAME 
SIGNALING FRAMING (FS) 
TERMINAL FRAMING (FT) 
FIGURE 2-D4 FRAMING FORMAT 
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							PERCEPTIONeb,, 
Tl/DS-1 
SEPTEMBER1991 
tion imposes that in every frame of 8(n+l) bits, 
where n = 1 - 23, there must be at least an “n” 
number of “ONE.” There can also be no more than 
15 consecutive “ZEROS” present. To comply with 
these requirements, the Tl/DS-1 interface pro- 
vides the following two techniques: 
1) Zero Code Suppression (ZCS): This tech- 
nique forces the second least significant bit of 
any time slot with eight consecutive “ZEROS” 
to “ONE.” 
2) Bipolar Eight Zero Substitution (B8ZS): 
This technique provides a unique algorithm. 
Whenever a time slot contains eight consecu- 
tive “ZEROS,” the “ZEROS” are replaced by an 
8-bit code (OOOll O-j.1). The bipolar violation 
occurs in the fourth and the seventh bit posi- 
tions of the inserted code. The receiving end 
recognizes this code, and it translates it into all 
“ZEROS” (see Figure 3). 
Voice and Data Applications: The Tl/DS-1 trunk TIE) provides a feature transparency to voice and 
datatransmission applications. PERCEPTIONeLex 
supports voice only with the NDTU. Data trans- 
mission must be done through a modem or modem 
pooling. 
Synchronization: The PERCEPTIONeLex Tl/DS- 
1 interface can support two types of clock synchro- 
nization. It can either generate the clock reference 
internally (Master) to the public digital or private 
digital network, or attain clock (Slave) from the 
external digital network. In case there is more than 
oneTl/DS-1 trunkinstalledin PERCEPTIONehex, 
only one will provide the clock synchronization 
signal. When connecting PERCEPTIONehex to the 
network, PERCEPTIONeLex will always be slave. 
Out of Frame (OOF) 
An Out of Frame (OOF) condition occurs when an 
error in the framing bit is observed. An error is 
considered to have happened when two out of four, 
or two out of five framing bits are absent. This 
capability to emulate different trunks (CO, DID, condition causes the MFALM LED to light. 
ORIGINAL WORD 
0 0 0 0 0 0 0 0 
SUBSTITUTED WORD 0 0 0 +I -1 0 -1 +I 
POLARITY* 
JJ 
*Assume last “ONE” transmitted was a 
positive “ONE. ” Polarity is reversed if 
the last “ONE” transmitted was a 
negative “ONE. ‘I Bipolar violations always 
occur at the 4th and 7th bit positions. 
FIGURES-SAMPLEOFB8ZSCODE 
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							PERCEPTIONeb,, 
Tl/DS-1 
SEPTEMBER 1991 
Loss of Signal (LOS) 
A Loss of Signal (LOS) condition is specified when 
the DS-1 signal is absent for more than 150 milli- 
seconds. Upon detection of LOS, the DS-1 inter- 
face generates a consecutive sequence of unfra- 
med all “ONE”signal, in orderto keep the regenera- 
tive repeaters alive. This condition causes the 
FALM LED to light. 
Jitter 
Jitters are short-term variations of significant in- 
stants (of a digital signal) from their idle positions in 
time. In the digital transmission, a jitter is generated 
from two principal sources, digital regenerator and 
multiplexers. A regenerator jitter is introduced by 
the imperfections in the timing recovery process, 
whereas a multiplexer jitter is mainly related to the 
stuffing mechanism used to synchronize the low 
speed incoming pulse stream. 
Jitters may introduce a number of impairments 
such as errors, slips, crosstalks, and distortions to 
the original signal. The following data indicates the 
maximum input jitter allowed in band 1 (10 Hz to 40 
KHz) and band 2 (8 KHz to 40 KHz). 
l Band 1: 5.0 per 648 nsec. peak-to-peak (10 Hz 
to 40 KHz) 
l Band 2: 0.1 per 648 nsec. peak-to-peak (8 KHz 
to 40 KHz) 
Slip 
Slip occurrences are caused by two factors: 
1) Lack of frequency synchronization between 
the two ends of the DS-1 network. 
2) Phase jitter. 
An overflow or underflow of the receiver buffer is 
indicative of a slip. 
Bipolar Violation (BPV) 
The Alternative Mark Inversion (AMI) coding is 
used in the DS-l/DMI line transmission. Any vari- 
ation to this rule is considered a violation. An excessive bipolar violation is declared when a 
number of BPV, which causes performance to r:- 
degrade, goes below the threshold of 1455 BPVs in 
1000 consecutive seconds. If a B8ZS coding is 
used, a bipolar violation detected due to “ZERO” 
substitution should not be considered an error. 
Cyclic Redundancy Check (CRC) 
The CRC is used with an Extended Super-frame 
(ESF). The CRC code uses 2Kb/s of the 8Kb/s- 
frame-bit pattern for an end-to-end error rate 
checking. 
AlTACHMENT B 
CHANNEL SERVICE UNIT 
1) A Channel Service Unit (CSU) provides the 
following: 
l Electrical protection 
l Keep-alive signal 
l Repeater function 
2) CSU requirements: 
l One CSU for each Tl/DS-1 interface con- 
nected to the network. 
l One CSU for a Tl/DS-1 interface between 
PBXs that are located more than 655 feet 
apart. 
3) Examples of approved CSUs: 
l Kentrox 
l Digital Link 
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							PERCEPTIONeh, 
SYSTEM RECORD 
FEBRUARY 1992 
Pdwceptionk 6; ex 
APPENDIX #I 
SYSTEM RECORD 
Version D.05  
						

							PERCEPTIONek, 
SYSTEMRECORD 
FEBRUARY 1992 
SYSTEM DATA BLOCK (DSYS Program)  
						

							PERCEPTIONeh, 
SYSTEM RECORD 
FEBRUARY 1992 
SYSTEM DATA BLOCK 2 (DSD2 Program) 
*Enter the name and access code in this column.  
						

							PERCEPTIONeh,, 
SYSTEM RECORD 
FEBRUARY 1992 
CLASS OF SERVICE DATA BLOCK (DCOS Program) 
NOTE: Use multiple lines as required. 
AlTENDANT DATA BLOCK (DATT Program) 
ITEM 
Attendant Number PROMPT 
REQ 
AN0 
ENTRY 
Al-l-0 ATT1 
0 
1 
NOTE: Use a second sheet if Tenant Service is activated. 
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							PERCEPTIONeh, 
SYSTEM RECORD 
FEBRUARY 1992 
ELECTRONIC/DIGITAL TELEPHONE BLOCK (DEKT Program) PCB Location (L 
1 
PROMPT ENTRY ENTRY ENTRY ENTRY ENTRY ENTRY ENTRY ENTRY 
’ _- 
d 
, I”U , 
I I I 
I I 
I I 
MT A I\T t N 
Button Acsinnmnnts- ““Syy . . I l”. ..“. 
DN Onlv! KEY 0 1 I I I I I I I Primary , 
t 1 
KEY 1 
KEY 2 
_--__ ^ 
KEY 4 
KEY 5 
KEY 6 
KEY 7 
KRV 8 
I -_-- - 1 KEY 9 1 
KEY 10 
KEY 11 
KEY 12 
NOTE: Use multiple sheets as required, 
Sheet / of 9 
-4-  
						

							STANDARD TELEPHONE DATA BLC 
ITEM 1 PROMPT 
Port Number 
Directory Number 
Station Set Mix 
Class of Service 
Tenant Number 
Call Pickup Group 
Hunt Number REQ 
POR 
DN 
SMX 
cos 
TEN 
PUG 
HNT 
Dialing Type 
Speed Dial List 
Warning Tone Allowed? 
Call Forward to Trunk 
Toll Restriction Class DLG 
SDL 
WTA 
CFT 
TOL 
Off-hook Call  Messaae Waitina Lamo 
I I 
Announce  Emeraencv Rinadown Station I 
I 
I 
MWL 
i RDS 
OCA 
PERCEPTION,~, 
SYSTEM RECORD 
FEBRUARY 1992 
CK (DSlT Program) PCB Location (1 
ENTRY 1 ENTRY 1 ENTRY 1 ENTRY 1 ENTRY 1 ENTRY 
I I I I I 
I I I I I 
I I I 
I 
STANDARD TELEPHONE DATA BLOCK (DSIT Program) PCB Location (L 
Message Waiting Lamp MWL 
Emergency Ringdown Station RDS 
Off-hook Call Announce OCA 
NOTE: Use multiple sheets as required. Sheet - of - 
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