GTE Omni Si Database Technical Practices Issue 1 Manual
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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 8l87s-93
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 8!87SVR 5210
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 8187
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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). 8187s-97
-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 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 S-988187SVR 5210
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 s-99
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 s-1 008187SVR 5210
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 SVR 5210ah37s-101
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). 8187SVR 5210