GTE Omni Si Database Technical Practices Issue 1 Manual
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TL-130500-1001 REMOTE DATA30.0 Remote Processors (RPs) such as the APMsPROCESSORS(Asynchronous Packet Managers), DFPIAPM (Digital SYSTEMFeaturephone with Asynchronous Packet Manager), and SPMsCONNECTIONS(Synchronous Packet Managers) are normally connected as shown in Figure 30.1. The asynchronous and synchronous processor (APM, DFPIAPM,SPM) can be located remotely to reduce traffic within the system. The remote processors eliminate the need for in-house processors. MPP I== I I IVOICE , VOICE , PACKET PACKET LINE LINEI I CARD 2 CARD 2I I I I II 11 II IIVOICE IVOICE IPACKET ; LINECARD ; SYNCHRONOUS i x 15 PUBLICDATA NETWORK KEY: mnRS-232-C CONNECTION :aRS-232-C OR V.35 CONNECTION B TWISTED PAIR Figure 30.1 Connection of Data Devices SVR 5210 8”87
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TL-130500-1001 APM (ASYNCHRONOUS31.0 The microprocessor controlled APM (Figure 31 .l) pcovidesPACKET MANAGER)the interface between the asynchronous data equipment EC-221 79-A(terminals, personal computers, etc.) and the VPLC (FB-17226) card or VPLC2 (FB-17426) card. Each APM connects to one asynchronous data device. SVR 5210TEST \, FRONT VIEWS REAR VIEWI II\II LINEDATA1’1 ’RESET OUT / IN DCEDTE IFigure 31.1APM 887
TL-130500-1001 The APM Assembly EC-22179-A0 Is used for devices that require an asynchronous W-232-C type interface l Supports devices that operate at speeds up to 19.2 Kbps The VPLC (FB-17226) that is used to support an APM is configured as a type VPLC 0 in data base, allowing all 8 ports of the card to be used (see Figure 31.2). NOTE: The VPLC2 (FB-17246) card, when configured as a type VP20 card in data base, can support APMs, DFP/APMs, and DFPs.Figure 31.2 APM Connection I ADMP-A FB-17229LPB S-2968187SVR 5210
SVR 5210TL-130500-1001 The APM, designed for desk-top installation, is housed in a small plastic case. A telephone can be put on top of the APM; cable connections are at the back of the APM. Each APM communicates with the system over a single twisted wire pair. This connection provides for continuous two-way transfer of data only (no voice). Using 26 gauge wire, the maximum distance from the APM to the system is 3000 feet. The maximum distance from the APM to the terminal equipment is 50 feet. The twisted pair (tip and ring) connection maximum distance between the APM and the system is 3,000 feet at 26 gauge. The maximum distance between the APM and its data equipment is 50 feet. The APM operates from 115 VAC through a step down transformer (to 22 VAC). The APM supports one single-speed asynchronous data device operating at speeds of 110, 300. 4 2C3, 2400. 4800, 9600 baud, or 19,200 BPS (bits per second). For RS-232-C compatible signals (ASCII) to be transmitted to the data system, it must first be converted into X.25 packets. The X.25 packet then must be broken down into 11 byte self-routing mini-packets for transportation to the system (Figure 31.3). The APM contains an 8-bit microprocessor memory, 16K of parity protected RAM, 8K of ROM, and a UART (Universal Asynchronous Receiver/Transmitter). Seven RS-232-C/V.24data set signals can be controlled. The AMP contains the mini-packet receiver/transmitter and line driver circuits used to communicate with the system. The ROM (Read-Only Memory) in the APM contains all programs necessary to boot the APM from the switch, and debugging and limited hardware self-tests. The RAM in the APM provides the operational code needed to communicate via the data system and is used for temporary storage, buffers, and operational parameters. The APM performs PAD (Packet Assembler/Disassembler) functions as well as containing the CRC (Cyclic Redundant Checking) error detect logic (see Figure 31.4). 8/87s-297
TL-130500-I 001- maximum distance RS-232-C maximum distance *- 3000’mini- packets m VPLC - Figure 31.3 Transport of Mini-Packets S-298 8187The protocol that governs the function of the PAD is X.3. The X.3 protocol provides a set of values or parameters that characterize the operations of the terminal that is paired with the APM. X.3 Parameters31.1 The X.3 parameters define the following basic functions of the data terminal: Q Packet Forwarding ? Break Handling 8 Flow Control @ Device Specific Characteristics @ Local Editing @ Local Echo SVR 5210
TL-130500-1001 digital bit stream APM packetizing datadata packets CRC address (control) (control “to”)rrgure 31.4ivmwacKeT: rrotocoIThere are eighteen standard X.3 parameters. The OMNIrequires an additional seven non-standard parameters, which are referred to as local parameters. The X.3 parameters are defined as follows: Parameter 1 - Escape from Data Transfer Parameter 2 - Echo Parameter 3 - Selection of Data Forwarding Signal Parameter 3 - Selection of Idle Timer Delay Parameter 5 - Ancillary Device Control Parameter 6 - Control of Pad Service Signals Parameter 7 - Selection of Operation of the Pad on Receipt of the Break Signal Parameter 8 - Discard Output Parameter 9 - Padding After Carriage Return Parameter 10 - Line Folding SVR 52108187s-299
TL-130500-1001 Parameter 11 - Binary Speed Parameter 42 - Flow Control of the Pad by the Start-Stop Mode DTE (Data Terminal Equipment) Parameter 15 - Editing Parameter 46 - Character Delete Parameter 17 - Line Delete Parameter 18 - Line Display Local Parameters31.2 In addition to the eighteen X.3 parameters the system operates under seven local parameters @ 0 - Escape to Local Parameters e 1 - Profile ID (Terminal ID) @ 2 - Eight Bit Transparency @ 3 - Parity @ 4 - Full Duplex @ 5 - Interval Timer 0 6 - Echo Mask An APM may be connected to a modem for access to the public switched network. In this case, it is necessary that the characteristics of the modem on each side of the connection match. The APM contains the following switches and status indicators: s-300 @ LINK Indicator. The LINK indicator shows whether the APM is in a test condition or is receiving/transmitting mini-packets. @ CALL Indicator. The CALL indicator shows whether the APM is in a call setup or loopback condition. 0 TEST Switch. The test switch is used to send an event to the ADMP to test the path to the APM. 0 RESET Switch. The RESET switch resets the APM when activated. @ DTE.:DCE Switch. The DTE/DCE switch selects the APM communication mode of operation. The APM communicates with terminal ecuipment in the DTE mode of operation. The APM communicates with modems in the DCE mode of operations. 8/87SVR 5210
Tt-130500-I 001SPM (Synchronous32.0 The microprocessor-controlled SPM (Figure 32.1) provides Packet Manager)the interface between the synchronous X.25 data equipment (EC-221 78-A/B)(Public Data Network, Host Computer, etc.) and the VPLC FB-17226 card or the VPLC2 FB-17246 card. Each SPM connects to one synchronous X.25 data device. SVR 5210FRONT VIEW GTEX.25 TESTSWITCHX.25 ACTIVELINKLINK REAR VIEW -*“-t-------~~LINEDATA r-7OUT I !N DCEDTEI Figure 32.1SPM (Synchronous Packet Manager) 8i87s-301
TL-130500-1001 Two versions of the SPM are available: l Assembly EC-22178-A (Figure 32.1)- Required by devices that use an RS-232-C/V.24 type interface. - This assembly supports devices that operate at speeds up to 19.2 Kbps. - The VPLC (FB-17226) used to support the EC-22178-A, is configured as VPLO in data base allowing all 8 ports of the card to be used. NOTE: The VPLC2 FB-17246 card, when configured as a VP20 card in data base, can support low-speed SPMs as well as DFP/APMs and APMs.l Assembly EC-22178-B (Figure 32.1) - Required by devices that use an V.35type interface. - This assembly supports devices that operate at speeds up to 64 Kbps. - The VPLC (FB-17226) used to support the EC-22178-B, is configured as VPLl in data base allowing it to use only two ports on the card. It is necessary to reduce ports available for high speed devices due to throughput requirements. NOTE: The VPLC2 FB-17246 card, when configured as a VP21 card in data base, can support two high speed SPMs.The SPM, designed for deskto-p installation, is housed in a small plastic case somewhat larger than the APM. Cable connections are made at the back of the SPM. Each SPM communicates with the system over a single twisted-pair wire. This connections provides for continuous two-way transfer of data only (no voice) information. Using 26 gauge wire, the maximum distance from the SPM to the system is 3000 feet. The maximum distance from the SPM to the terminal equipment is 100 feet. An SPM is locally powered over a separate twisted pair. The SPM operates from 115 VAC through a stepdown trznsformer to 24 VAC. The SPM supports up to 256 virtual circuits allowing for up to 256 multiple calls over the SPM’stwisted pair line.Multiple virtual circuits are maintained by the logical channel numbers and device numbers that are assigned to each data call by the SPM. I S-3028187SW 5210