MT9076
1.0 MT9076 Line Interface Unit (LIU)..................................................................................17
1.1 Receiver .................................................................................................................................................17
1.2 Transmitter .............................................................................................................................................18
1.3 20 Mhz Clock..........................................................................................................................................21
1.4 Phase Lock Loop (PLL)..........................................................................................................................22
2.0 Clock Jitter Attenuation Modes....................................................................................23
2.1 Jitter Attenuator FIFO.............................................................................................................................24
2.2 IMA Mode...............................................................................................................................................24
2.2.1 T1 Mode ......................................................................................................................................... 24
2.2.2 E1 Mode ......................................................................................................................................... 24
3.0 The Digital Interface ......................................................................................................24
3.1 T1 Digital Interface .................................................................................................................................24
3.2 Frame and Superframe Structure in T1 mode........................................................................................25
3.2.1 Multiframing.................................................................................................................................... 25
3.3 E1 Digital Interface.................................................................................................................................27
3.3.1 Basic Frame Alignment .................................................................................................................. 28
3.3.2 CRC-4 Multiframing in E1 mode..................................................................................................... 29
3.3.3 CAS Signaling Multiframing in E1 mode......................................................................................... 30
4.0 MT9076 Access and Control.........................................................................................30
4.1 The Control Port Interface......................................................................................................................30
4.2 Control and Status Register Access.......................................................................................................31
4.3 Identification Code..................................................................................................................................31
4.4 ST-BUS Streams....................................................................................................................................31
5.0 Reset Operation (Initialization).....................................................................................32
6.0 Transmit Data All Ones (TxAO) Operation ..................................................................33
7.0 Data Link Operation ......................................................................................................33
7.1 Data Link Operation in E1 mode ............................................................................................................33
7.2 Data Link Operation in T1 mode ............................................................................................................33
7.2.1 External Data Link .......................................................................................................................... 35
7.2.2 Bit - Oriented Messaging................................................................................................................ 35
8.0 Floating HDLC Channels ..............................................................................................35
8.1 Channel Assignment ..............................................................................................................................35
8.2 HDLC Description...................................................................................................................................36
8.2.1 HDLC Frame structure ................................................................................................................... 36
8.2.2 Data Transparency (Zero Insertion/Deletion) ................................................................................. 36
8.2.3 Invalid Frames................................................................................................................................ 36
8.2.4 Frame Abort.................................................................................................................................... 37
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