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MH89760B Datasheet(PDF) 21 Page - Mitel Networks Corporation |
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MH89760B Datasheet(HTML) 21 Page - Mitel Networks Corporation |
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21 / 38 page  4-75 Preliminary Information MH89760B Figure 14 - ISDN Voice Data Channel Bank Digital Line Interface Switch Matrix T1 Interface MT8910 MT8980 MT8910 MT8952 MT8952 MT8952 MT8941 ZT ZT DSTo DSTi DSTo DSTi DSTo DSTi DSTo DSTi DSTo DSTi STi0 STo0 C4i F0i STo1 STi1 STo2 STi3 STo3 D-Channel Processing DSTi DSTo CSTi0 CSTo CSTi1 C2i C1.5i OUTA OUTB RxR RxT E8Ko F0i F0i E8Ko C4o C2o F0o C1.5 Equal- izer µP µP µP µP • • • • • • • • • • • • MH89760B • • • • • • • • • • • • • • To control and monitor the MT8910s and the T1 interface the switch matrix operates some of its input and output streams in message mode. This enables the system to control all of the functions of the MT8910s and the T1 interface through the Control ST-BUS points, (CSTi/o). Clock synchronization is done by the MT8941. Phase-locked loop # 2 generates ST-BUS clocks that are synchronized to the extracted 8kHz output from the T1 interface. Phase-locked loop #1 generates the transmit T1 clock synchronized to the ST-BUS clocks, which are synchronized to the extracted T1 clock. This scheme will also allow the system to operate in a loop timed mode. With appropriate multiplexing a single D channel processor can handle all 23 2B+D interfaces. If both B channels on all 24 lines are going to be used then it would be necessary to use two T1 trunk interfaces. 5. Digital Access Cross Connect System (DACS) The Digital Access Cross Connect System (DACS) is a T1 switch with 127 T1 lines as input and output plus one T1 line that is reserved for test and maintenance purposes. A DACS is capable of switching any input channel on any T1 trunk to any output channel on any T1 trunk. There are four main blocks in Figure 15, the T1 interfaces, the switch matrix, the control matrix, and the clock generator. The digital trunk interface is made up of the MH89760B plus the additional components required to interface to the transmission line. The MH89760B handles all of the required transmit and receive data formatting, and converts the 1.544 MHz serial stream into ST-BUS format so that it can be routed through the MT8980 synchronous switch matrix. |
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