GTE Omni Si Database Technical Practices Issue 1 Manual

TL-130500-1001PFILE 1RECORD 0
Figure 4.16Disk File BreakdownDIRECTORY ENTRY RECORD-(DER)
DIRECTORY ENTRY FOR FILE 
‘XXXXXXXXX’1ST FLB
FILE LINKAGE BLOCK (FLB)
BYTE
VOl2345678249 250251 252 253 254 255
NEXT
FLB DBA
PREV
FLB DBA1ST
FDB DBA: :82ND83RD
FDB DBAFDB DBAI I
I
FILE DATA BLOCK (FDB)
BYTE
VOl23456789252253254255DATA BLOCK DIVIDED INTO RECORDS
l .
l rIzlFOR A 10 MBYTE DISK THE DBA HAS THE FOLLOWING FORMAT;
DISK BLOCK ADDRESS (DBA)IBIT1
151413 1211 109876 543 210
CYLINDERNUMBER...

TL-130500-1001Disk File Directory4.9.4 The Disk File Directory contains the names and attributes
of all the files on the disk. The directory is organized as a file of
320 records (floppy disk has only 64 entries) consisting of 32
bytes each. Each record contains one directory entry. The
directory is write-protected to prevent accidental overwriting or
deletion. The FMS directly accesses the directory which resides
on cylinder 0.
Disk File Directory record format (Figure 4.18) and restrictive...

TL-130500-1001(*) FORMAT OF BYTE 0
BIT
76543210
IU NU FC SY
BYTE
/O/l2345678910
1112131415XFILE NAME 9 BYTESRECORD
FILERECS
ASCII ALPHANUMERICSIZESIZEUSED
BYTE
16171819202122232425262728
293031CREATEDLAST MODIFIEDFIRSTSEC
DAY MON YR HR MINDAY MON YR HR MINFLB DBA **
SPARE
/TIME STAMPS ARE IN BCDI
(**) FORMAT OF BYTE 29
BIT
765432IOREAD SECURITYWRITE SECURITY
SW 5210
Figure 4.18Disk File Directory Record Format
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TL-130500-1001
CD-1005.0 This section describes circuit switched data.Data Option
Overview
Major Hardware5.1 The CD-100 circuit data option uses the existing voice
Componentshardware to transfer data. By means of TDM (Time-Division
Multiplexing), data is “hopscotched” over voice; separation of
data from voice is provided for by use of a selective filter (see
Figure 5.1).The additional hardware components necessary to support this
data option are:
* Digital Featurephone with data option
* DVCIP...

-iITL-130500-1001
Conceptual5.3 The voice switch uses a PCM (Pulse Code Modulation) bus
Overviewfor voice traffic (Figure 5.2).
* Technical specification for CD-100 are as follows:
- PCM (Pulse Code Modulation)
- Bit clock - 1.544 MHz
- 24 channels/PCM frame
- 8 bits per channel
- 1 frame synchronous bit per PCM frame
- Total bits per frame = 24 x 8 = 192 + frame synchronous
bit = 193
- Time per frame =1xl92 =125 usec1.544 MHz
e Voice call process (Figure 5.3) for CD-100 is as follows:
- Analog voice...

TL-130500-1001
IL
SVR 52108187MICROPHONE
D+qD$GlTAL LEKpiqSPEAKER
DIGITAL
ANALOG 
-----) 4) f- ANALOG
Figure 5.3 Voice Call
Data Call Process5.4 Data calls (Figure 5.4) are processed by the following:
l Origination -- multiplex data bytes with voice bytes and
place on existing digital link (PCM). This concept is possible
because digital voice in 8 bytes can be thought of as data
bytes. Thus, on a PCM bus, voice and data have identical
properties.
l Termination -- demultiplex data bytes from voice bytes...

l-L-1 30500-l 001
Data Device
Configuration5.5 Figure 5.5 shows how a data call is placed. Figures 5.6 and
5.7 show incoming and outgoing modem calls to the CD-100.DTEEND USER
TERMINAL
MPP
DIGITALFEATUREPHONE
OMNI-SIPCM
-BUS
CD-l 00
DTEHOST COMPUTER
Figure 5.5End-User Data Terminal and Host Computer Data Call
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TL-130500-1001OMNI SIFROM
DCE
DIE
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C-232-CDIGITAL
FEATUREPHONE
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TL-130500-1001
DIGITAL
FEATUREPHONEOMNI SI
IFEATUREPHONE
(LOOP, E&M)
II
Figure 5. 7Outgoing Modem Call
Primary Circuitry/5.6 The primary circuitry and components of CD-100 utilizes
Componentsthe MPRT (Mini-Packet ReceiveriTransmitter) to process packet
data. MPRT implements the Fujitsu GTE proprietary MPP 
(Mini-Packet Protocol). The MPRT, equipped in the Digital
Featurephone and the 
DVCIP interface card, allows
communication between the two (see Figure 5.8).
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