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 0..305TRACKSECTOR#0..31I a
IFigure 4.17FMSD Disk File LayoutSVR 5210
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							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
considerations are defined as follows:
l IU: Directory record is IU (In-Use)
l NU: record has never been used
l SY: FMSD system file
l FC: file was forced closed
The NU (Never Used) bit in byte 0 of a directory record shortens
search times for file names.When the first NU bit is found
during the search for a file name, the rest of the directory is
known to be empty. When you delete a file, the IU (In-Use) bit
in byte 0 of the directory record is cleared. The directory record
is then free to be used when another file is created. Setting the
FC (Forced Closed) bit in byte 0 of the directory record is
performed whenever a file open with an access of Write or
Update is closed due to a Reset command or FMS restart.
s-94
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							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 (FB-17236-A Data/Voice Control Interface Processor)
l Single pair of wires providing capability of transmitting data
along with voice and control information
INTERFACE
PROCESSOR
DIGITAL
FEATUREPHONE
with
DATAV = DIGITAL VOICE
IiC = DIGITAL CONTROL
D = DIGITAL DATA
SVR 5210
rlgure 3.1L;IrcuiT: swlrcnea uara
Operational5.2 Operational characteristics of CD-100 are as follows:
Characteristics
* Asynchronous, full-duplex data transmission up to a rate of
19.2 
kilobits per second (19.2 kbps).
0 Digital Featurephone connects to one ASCII terminal, an
auto-answer modem, an auto-dial modem, or a host
computer by an RS-232-C interface that is located in the
rear of the telephone.
0 DCE/DTE configuration is determined by a hardware strapping
option that allows the Digital Featurephone to function in either
a DCE mode (i.e., connected to a terminal and/or host
computer) or a DTE mode (i.e., connected to a modem).
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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 input is sampled every 125 usec.
- Analog input is converted to 8 bit digital form.
- 8 bits are placed on a digital link during an assigned
channel.
- Bits are taken from the channel at the receiver side and
reconverted to analog voice.
/
I
[Ii  
4\~  F!I,(  Sync
i  Bit (1 Bit)PCM23 ,,.., Frame
- 8 Bits /
Figure 5.2PCM (Pulse Code Modulation) Bus
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							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 and
route to data device.
MICROPHONE
SPEAKER
DIGITAL
DATADATA
SENDINGRECEIVING
DATADATA
DEVICEDEVICE
-_ -Figure 5.4Data Call Processing
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							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
. . . . .$$DVI-JP
I :::: :.:.,,.: ::.::..::::: :., ,. .:.:.j:.:.:_:.:.:...::,::::-.-2:: :::I:~~:i:i:i::::-iiil::ii:iqii:i:i~~~~:~-.
C-232-CDIGITAL
FEATUREPHONE
:::.:::::,:::::::::::.:::.: y;:,,;: .::y::, ; j
. ................................:.:.:...:.:.:.:.:.:.:.......:.:.:.:.~:::~::.::.:::::::j::;:::::::.:::::...:. .:::....i..::::::::..:::::::: ..:.:.....:.: . .
l-l
c*-ii:;i.; DV(-,P II;:;.k’-:~::‘~.:.:.:.:.:.:.:.:.......................:.: ‘j#-i :;~.~.~.~,~.::~‘:::‘~ +::y:...:;,y:....:.:.i:;:;::.; i:::j:j:;:;::::::::. ::,:.::::::,:::j: .j:y:j,7
cHOST COMPUTER
Figure 5.6Incoming Modem Call
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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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