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MT9079AC Datasheet(PDF) 43 Page - Mitel Networks Corporation |
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MT9079AC Datasheet(HTML) 43 Page - Mitel Networks Corporation |
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43 / 54 page  MT9079 4-279 Common Channel Signalling Interface Figure 14 shows how to interface DSTi and DSTo time slot 16 to the MC68302 for the control of Common Channel Signalling (CCS) data. As can be seen in the timing diagram, the MT8980D CSTo signal must be programmed to go high during the bit position just before time slot 16 (i.e., time slot 15, bit 0). This will enable the NMSI1 pins for one time slot (eight C2 cycles) when the NMSI1 port is operated in PCM mode. The STo stream of the MT8980D must also be programmed to be high impedance during time slot 16. C2 is used to clock data into and out of the NMSI1 port. It should be noted that the DS signal of the MC68302 must be inverted to interface to the MT8980D. Also, DTACK must be connected to the MT8980D DTA and pulled-up with a 909 ohms resistor. The MT9079 Transparent Mode Figure 15 illustrates an application in which the MT9079 transparent mode can be used. That is, a digital cross-connect multiplexer that switches complete PCM 30 trunks and does not require time slot switching. It should be noted that any MT9079 devices that transport time slot switched data must operate in termination mode otherwise, the CRC-4 remainder will be in error. In transparent mode the complete PCM 30 data stream will pass through the MT9079 except for the data link (Sa4 of the NFAS - 4kbit/sec. maintenance channel). The CRC-4 remainder will not be generated by the transmit section of the MT9079, but the CRC-4 remainder bits received on DSTi will be modified to reflect the new data link bits. This has the advantage that any CRC-4 errors that occur on the Figure 15 - PCM-30 (E1) Trunk Cross-Connect using the MT9079 Transparent Mode Figure 16 - MT9079 Fibre Interface Circuit DSTo DSTi C4i/C2i E2i TxA TxB RxA RxB MT9079 C4 TxMF To Line RxMF To Data Link Controller DSTo DSTi C4i/C2i E2i TxA TxB RxA RxB MT9079 C4 RxMF To Line TxMF To Data Link Controller Interface Interface Digital Cross-Connect Matrix MT8980D STi0 STo0 Switch 0,0 MT8980D Switch 0,M MT8980D Switch n,0 MT8980D Switch n,M m+1 Frame Delay DSTi DSTo C4i/C2i E2i TxA TxB RxA RxB MT9079 C2 CLKi C4 Datai Tx+ Tx- Data0 RxCLK CODEi NRZ NRZ Tx+ Tx- RxData Manchester Encoder Manchester Decoder Transmit Fibre Interface Receive Fibre Interface Receive Fibre Transmit Fibre |
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