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MT9172AP1 Datasheet(PDF) 6 Page - Zarlink Semiconductor Inc |
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MT9172AP1 Datasheet(HTML) 6 Page - Zarlink Semiconductor Inc |
6 / 28 page MT9171/72 Data Sheet 6 Zarlink Semiconductor Inc. Figure 5 - DV Port - 80 kbit/s (Modes 0,4) Figure 6 - DV Port - 160 kbit/s (Modes 0,4) In DIGITAL NETWORK (DN) mode, upon entering the DNIC from the DV and CD ports, the B-channel data, D- channel D0 (and D1 for 160 kbit/s), the HK bit of the C-channel (160 kbit/s only) and a SYNC bit are combined in a serial format to be sent out on the line by the Transmit Interface (Figures 11, 12). The SYNC bit produces an alternating 1-0 pattern each frame in order for the remote end to extract the frame alignment from the line. It is possible for the remote end to lock on to a data bit pattern which simulates this alternating 1-0 pattern that is not the true SYNC. To decrease the probability of this happening the DNIC may be programmed to put the data through a prescrambler that scrambles the data according to a predetermined polynomial with respect to the SYNC bit. This greatly decreases the probability that the SYNC pattern can be reproduced by any data on the line. In order for the echo canceller to function correctly, a dedicated scrambler is used with a scrambling algorithm which is different for the SLV and MAS modes. These algorithms are calculated in such a way as to provide orthogonality between the near and far end data streams such that the correlation between the two signals is very low. For any two DNICs on a link, one must be in SLV mode with the other in MAS mode. The scrambled data is differentially encoded which serves to make the data on the line polarity-independent. It is then biphase encoded as shown in Figure 10. See “Line Interface” section for more details on the encoding. Before leaving the DNIC the differentially encoded biphase data is passed through a pulse-shaping bandpass transmit filter that filters out the high and low frequency components and conditions the signal for transmission on the line. Channel Time 0 D-Channel Channel Time 1 C-Channel Channel Time 2 B1-Channel 11.7 µsec F0 C4 DSTo DSTi F0o D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 C0 C1 C2 C3 C4 C5 C6 C7 B7 B6 B5 B4 B3 B2 B1 B0 C0 C1 C2 C3 C4 C5 C6 C7 B7 B6 B5 B4 B3 B2 B1 B0 D0 D0 Channel Time 0 D-Channel Channel Time 1 C-Channel Channel Time 2 B1-Channel 15.6 µsec F0 C4 DSTo DSTi F0o D0 D1 D2 D3 D4 D5 D6 D7 D0 D1 D2 D3 D4 D5 D6 D7 C0 C1 C2 C3 C4 C5 C6 C7 B7 B6 B5 B4 B3 B2 B1 B0 C0 C1 C2 C3 C4 C5 C6 C7 B7 B6 B5 B4 B3 B2 B1 B0 D0 D0 Channel Time 3 B2-Channel B7 B6 B5 B4 B3 B2 B1 B0 B7 B6 B5 B4 B3 B2 B1 B0 |
Similar Part No. - MT9172AP1 |
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Similar Description - MT9172AP1 |
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