GTE Omni Si Database Technical Practices Issue 1 Manual
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TL-130500-1001 PDN Telenet\PEC bus \LPB \PCM bus Figure 32.2Synchronous Packet Manager Interface For an X.25 packet to be transmitted to the data system, it must be broken down into 1 l-byte packets, called mini-packets, which adhere to the MPP (Mini-Packet Protocol) format. For transmission from the PABX to the data network, mini-packets are stored (buffered) until a full X.25 packet is formed and then transmitted (see Figure 32.2). SW 5210Em7s-303
TL-130500-1001 The SPM contains two 8-bit microprocessors, 80K of parity protected RAM, and 8K of ROM. The SPM contains the mini-packet receiver/transmitter and line driver circuits used to communicate with the PABX. The ROM in the SPM contains the programs necessary to boot the SPM from the PABX, a debugger, and limited hardware self-tests. The RAM in the SPM is provides the operational code needed to communicate with the data system, and is used for temporary storage, buffers, and operational parameters. The SPM performs packet assembler/disassembler functions and also contains the CRC (Cyclic Redundant Checking) error detect logic. The SPM contains the following switches and indicators: * SWITCH LIKK Indicator.This indicator shows whether the SPM is in a test condition or is receiving/transmitting mini-packets. 0 X.25 TEST ACTIVE Indicator. This indicator is off during normal operation.When the TEST pushbutton is depressed and diagnostic software is being downloaded from the system, this indicator will be on. l W25 TEST Pushbutton. This pushbutton is not operational for this version. r RESET Pushbutton. The RESET pushbutton causes a reset condition when depressed. @ DTE/DCE Switch. This two-position switch sets the SPM data communications mode of operation. When depressed, the SPM is in the DTE (Data Terminal Equipment) mode, allowing it to be connected to terminal equipment. When released, the SPM is in the DCE (Data Communication Equipment) mode, allowing it to be connected to transmission lines. s-304 8187SVR 5210
TL-130500-1001DFP/APM (DIGITAL33.0 The DFP/APM provides voice communication as well as FEATUREPHONEthe interface between the asynchronous data equipment WITH APM)(terminals, personal computers, etc.) and the VPLC2 FB-17246 card. The DFP/APM interfaces with the voice system over the PEC and PCM buses and the data system over the LPB (Figure 33.1). Connection to the VPLC2 (FB-17246-A) card is over a single twisted pair. This connection supports both IJoice and data communications. The DFP/APM is either locally or remotely powered over a separate twisted pair connection. Connection to the data device is provided by a standard RS-232-CN.24 interface, located in the rear of the phone. Operating speeds of the data device can be 110. 300, 1200, 2400, 4800, 9600 baud, and 19,200 bps. Contained within the DFP/APM are the 8-bit microprocessor, memory, packet assembler/disassembler, transmit/receive buffers, the CRC (Cyclic Redundant Check) error detect logic. SVR 5210 8187s-305
TL-130500-1001T+R O- Figure 33.1DFP/APM Voice and Data Bus Connection . 7- T+R DFP/APM+1 FB-228[Tl\LPB ’ DFP/APMTransmission33.1 Transmission of 11 -byte voice, data, and control information is sent as mixed mini-packets. The 11 -byte mini-packets are transmitted at 128 Kbps in each direction. The effective throughput is 64 Kbps voice, 19.2 Kbps data and overhead= 128 Kbps in each direction. See Table 33.1 for feature comparisons of the APM, SPM, and DFP/APM. Tables 33.2 and 33.3 provide CCITTrecommendations and descriptions for the APM, SPM, and DFP:APM.S-306 8/87SVR 5210
:TL-130500-1001 DFPIAPM mini-packets dPLC2 Figure 33.2Transmission from the Digital FeaturephonetotheSystem Simultaneous Voice33.2 The simultaneous voice and data structure is: Packetizingand Datal Data device log-on l Data call distinctive or simultaneous with voice call l Data characters briefly buffered at Digital Featurephone l Data characters packetized in 8-byte groups at Digital Featurephone l Preceded with two address bytes e Followed with one CRC error-checking byte l 11 bytes equal one mini-packet When the mini-packet arrives at the VPLC2 (Voice Packet Line Card) (Figure 33.2), it is given two extra bytes providing “from” information. SW 52108187s-307
TL-130500-1001 digital bit stream voice and data packets CRC (control)address (control “to”) MPP 11 bitsNetwork Interface Card33.3 The NIC (Network Interface Card) bridges the LPB (Local Packet Bus) and the PCM (Pulse Code Modulation) bus. This provides data networking capabilities between systems across a Tl network interface. HDLC (Higher Data Level Control) conveys the data to/from the PCM bus while MPP (Mini-Packet Protocol) conveys data to/from the LPB (Figure 33.3). The NIC provides an X.25 communication link between a circuit-switched Tl trunk line and a packet-switched async/sync data line. The card indirectly interfaces to an outside Tl line via internal circuit-switched connections on the PCM bus. True intergrated voice and packet-switched data networking capabilities are provided by this card (see Figure 33.4).The NIC’s responsibility is similiar to that of the SPM. However some major physical differences between the NIC and the SPM are:l The NIC occupies a complete slot space allowing it an ABI (Arbitrated Bus Interface) and a PCM interface l The NIC has 256K bytes of shared memory l The NIC has DMA (Direct Memory Access) hardware support, an associated new MPCC (Multiple Protocol Communication Control) chip, and a new interrupt control mechanism. 8187SVR 5210
TL-130500-1001Table 33.1 Feature Comparison NOTES:* 1. For information on VPLC cards, see section 7.0. * 2. SPMs can interface with an RS-232-C if speeds are below 19.2 Kbps. * 3. Throughput will vary according to the PAD (Packet Assembler/Disassembler) parameter settings and data format. * 4. For speeds > 9.6 Kbps up to 64 Kbps. axrmum distance from switch-3000 feetat ITT V.35interface SW 52108187s-309
TL-130500-1001Table 33.1Feature Comparison (Continued) s-31 0cket Assembler/ ontains CODECand other associated I circuitry Table 33.2 CCITT Recommendations FEATURENOTE: X.28 is the language by which an X.3 command is entered, converting async. data into X.25 packets, thereby allowing the user to enter information through the k:?yboard of the data device attached to the APM Interfaces externally to X.25 host or X.25 PDNS (Telenet) 8/‘87, X SW 5210
SW 52108187DEVICE 3FP/APM EC-221 79-AAPM L I 1I i c i EC-221 78-ASPM Type A EC-221 78-BSPM Type BTL-130500-1001 Table 33.3 DFP/AMP, APM, SPM Description FEATURE l Provides interface between asynchronous data equipment and the system l Receives and transmits W-232-C compatible signals, converting them into mini-packet protocol lCommunicates with the system over a single, twisted-wire pair lSupports speeds up to 19.2 Kbps l Provides interface between asynchronous data equipment and the system l Receives and transmit RS-232-C compatible signals, converting them into mini-packet protocol lCommunicates with the system over a single, twisted-wire pair lSupports speeds up to 19.2 Kbps lUsed for devices needing RS-232-C interface lSupports devices operating at speeds up to 19.2 Kbps lCommunicates with the system over a single, twisted-wire pair *Used for devices needing V.35 interface lSupports devices operating at speeds up to 64 Kbps eCommunicates with the system over a single, twisted-wire pair s-31 1
TL-130500-1001 OMNI-SIPCM BusPD-200LPBCircuit Switched -:;f-Packet Switched c-- Tl24 TlChannelst----- PD-200 -----i)Fiaure 33.4NIC Card within the OMNI SI Svstem’s Architecture s-31 2 -- -, - ---~- -_... -__-_._ 8187SVR 5210