GTE Omni Si Database Technical Practices Issue 1 Manual
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TL-130500-I 001 Digital Featurephone voice f---)non-voice control & data control & dataL Figure 5.8Digital Featurephone Data Packet Flow DVCIP IMPRTf3 voice pt+iL non-voice Mini-Packet 5.7 The following are characteristics of MPP (Mini-Packet ProtocolProtocol) (see Figure 5.9). Characteristicsl Link runs at 256 Kbps, ping pong (ping pong = once bus seizure is established, link runs at 128 Kbps in each direction). * Each mini-packet consists of: - Sync Flag (l/2 byte) - Header(2 byte-9 - Data(8 bytes)- CRC(1 byte)l The first bit of first header byte determines whether the current mini-packet is voice or non-voice. - 1 = voice - 0 = non-voice SYNC header f--- data field -CRC IFigure 5.9 Mini-Packet l Channels available. - 64 KbpsVoice - 19.2 Kbps Data - 4 KbpsControl - 40.8 Kbps Overhead and Guardband SVR 5210 8187s-1 03
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r TL-130500-1001 PD-200 DATA OPTION6.0 In addition to the voice features available with the OMNIOVERVIEWPABX, the PD-200 Data System (Figure 6.1) provides: 0 Separate data and voice switching - Voice traffic uses circuit switching. - Data traffic uses packet switching. 0 ASCII (American National Standard Code for Information Interchange) asynchronous data at speeds up to 19.2, Kbps (Kilobytes per second). l CCITT (Consultative Committee on International Telegraphy and Telephony) X.25 synchronous data at speeds up to 64 kbps. Personal Computers Voice-Data Work Station Terminals Word Processors Key Systems Printers Telephones Featurephones r 8Figure 6.1 OMNI PD-2C SVR 5210Connections to: l Public Telephone Network o Private Telephone Network l Public Data Network * l Private Data Network l Other Common Carriers l Other PABXs, ETC. Data System6.1 (Figure 6.1) With the PD-200 Packet Data System option, Overviewthe voice and data systems are combined within the PABX. The voice and data systems share: l Cabinet (they are both housed in the same physical location) l Power source * Single pair from the DFP/APMs to the FB-17246-A card 8l87s-1 05
TL-130500-1001 l Mass storage system of the hard and floppy disk- Access from the data system to the hard disk is via the SASI(Shugart Associates Standard interface) bus (Figure 6.2). - The hard disk accesses the generic programs and the data base. VOICE ElCEC BUSF’LE SWITCH+ ’ ’ ’ ’ ’ ’ . ’ -b y!s;;;;Ayl FB-17220-BOAI 1 I I; 1iI 1 ADMINISTRATIVE ’SAYII 1II IANDASSEMBLY EC-22199-ABUSII L --______________ - MAINTENANCEL------_--_-___-__-_PROCESSOR:______________________________PEC BUS (ADMP-C) LPBFB-17230-BOA Figure 6.2Data System Access to Mass Storage S-106 System Buses6.1.1 The voice and data hardware use separate buses for the switching of signals; this is referred to as dual bus architecture. Through dual bus architecture, voice and data signals are always separate and have no effect on one another. Buses that are responsible for voice transfer and switch interaction are: l PCM (Pulse Code Modulation) bus 0 PEC (Peripheral Equipment Complex) bus The bus used by the data system for the transfer of data packets is the LPB (Local Packet Bus). 8!87SW 5210
--TL-130500-1001 Data Components6.1.2 Components of the data system that are separate from the voice switch include:l Netlink processor for control of data and call setup or takedown l Administrative processors that maintain and administer the data switch featuresl Facilities processor that performs call processing functions and interfaces with the PEC bus.Advanced data features provided by the data system include: l Packetization of data and control information for transferthrough the system l Speed and protocol conversion l CCITT X.25, X.3, X.28, and X.29 signaling based standards SVR 5210 8187s-1 07
TL-130500-1001Administration6.2 Data system administration functions are given as an extension of the existing voice system. The facilities that provide the administration functions are based separately. Access to these functions, which include Recent Change, maintenance, accounting, diagnostics, and event reporting, is through the voice switch maintenance console and a data maintenance console, that interfaces the system via the ADMP (Administrative Maintenance Processor) (Figure 6.3). S-108NOTE: A separate console for d-ata is required. PEC BUS Local Packet BUS PCM BUS Figure 6.3 ADMP Terminal NOTE: The ADMP is a two-card set: the maintenance terminal connects to the A card. Any terminal used with the data system must be VT > 101 compatible. .8187SW5210
TL-130500-1001 Data Transport 6.3 Data switching that does not affect voice capacity is possible because of the PTS (Packet Transport System). A new bus structure, called the LPB (Local Packet Bus), has been added to the backplane. The LPB is only for data transfer (Figure 6.4). Self-routing entities, called mini-packets, perform communication within the packet transport system (see paragraph 6.4). Each device communicates with the switch by means of the PTS (Packet Transport System), and is assigned its own PLA (Packet Line Address).PCMUS GROUP CGRgUPIUP 4 -z ;- : - -2 0 - :mP c : - EXP;~~‘“” W) STEZED (Y) --+ GRtUP - PCMUS GROUP C FILE B :; I t( +-COMMON CONTROL LOCAL PACKET 0 ->Figure 6.4 Possible Local Packet Bus Configuration SW? 5210 8l87
TL-130500-1001Packet Line Address6.3.1 This paragraph describes the PLA (Packet Line Address). l The PLA gives the internal address of the component to which it is assigned: - This assignment is performed automatically by the data system. - The assignment is based on the hardware configuration of the system. l The PLA has no relationship to the subscriber line number that the user sees. l The PLA is made up of 14 bits of address information. Devices that communicate over the PTS use a FGBS proprietary or internal protocol, known as MPP (Mini-Packet Protocol), to ensure error-free communication. CRC (Cyclical Redundant Checking) performs error detection. NOTE: A proprietary protocol is one that need not comply to any CCITT recommendations because it is internal to the PABX. Local Packet6.4 The following major components connect to the Bus interfacesLPB (Local Packet Bus ) and require a PLA (Packet Line Address). NOTE: Cards that transport data packets are described later in this document. l UCB/DCP (Universal Controller Board) requires one PLA. This card provides the processing power needed to supply the features of the Digital Featurephone and the data system, such as call setupitakedown. l ADMP (Administration and Maintenance Processor) requires one PLA. This card provides administrative and loading functions. l NIC requires one PLA. This card provides a network interface. l VPLC (Voice Packet Line Card) requires one PLA for each circuit activated (8 maximum). s-1108187SVR 5210
TL-130500-1001 The VPLC (card type VPLO and VPLl) connects remote processing devices to the PABX. These devices are: l APM (Asynchronous Packet Manager) which connects to asynchronous devices that operate at lower speeds l SPM (Synchronous Packet Manager) which connects to synchronous devices that usually operate at a higher speed (9.6-64 Kbps.) l DFP/APM (Digital Featurephone with APM) which connects to asynchronous devices that usually operate at a higher speed The VPLC2 (card type VP20) connects remote processing devices to the PABX. These devices are: l APM which connects to asynchronous devices that opera:? at lower speeds l SPM which connects to lower speed (up to 19.2 Kbps.) synchronous devices l DFP/APM which connects to asynchronous devices that operate at lower speeds The VPLC2 (card type VP21) connects remote processing devices to the PABX. This device is: 0 SPM which connects to higher speed (9.6-64 Kbps) synchronous devices SVR 5210 8/87S-l 11
TL-130500-1001APM SPMSPM j Figure 6.5,Remote ProcessorNPLC (Voice Packet Line Card) Connection s-112 . . 8187SVR 5210