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MT8931CE Datasheet(PDF) 10 Page - Mitel Networks Corporation |
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MT8931CE Datasheet(HTML) 10 Page - Mitel Networks Corporation |
10 / 40 page MT8931C 9-80 After successfully completing a transmission, the internal priority level is reduced from high to low. The internal priority will only be increased once the terminal count for the respective level of priority has been achieved. (e.g., if TE has high priority internally and externally, it must count 8 consecutive ones in the D-echo channel. Once this is achieved and successful transmission has been completed, the internal priority is reduced to a lower level (i.e., count = 9). This terminal will not return to the high internal priority until 9 consecutive ones have been monitored on the D-echo channel). Line Wiring Configuration The MT8931C can interface to any of the three wiring configurations which are specified by the CCITT Recommendation I.430 and ANSI T1.605 (refer to Figures 8 to 10). These consist of a point-to-point or one of the two point-to- multipoint configurations (i.e., short passive bus or the extended passive bus). The selection of line configurations is performed using the timing bit (B4 of NT Mode Control Register). For the short passive bus, TE devices are connected at random points along the cable. However, for the extended passive bus all connection points are grouped at the far end of the cable from the NT. For an NT SNIC in fixed timing mode, the VCO and Rx filters/peak detectors are disabled and the threshold voltage is fixed. However, for a TE SNIC or an NT SNIC (in adaptive timing mode), the VCO and Rx filters/peak detectors are enabled. In this manner, the device can compensate for variable round trip delays and line attenuation using a threshold voltage set to a fixed percentage of the pulse peak amplitude. Another operation can be implemented using the SNIC in the star configuration as shown in Figure 14. This mode allows multiple NTs, with physically independent S-Busses, to share a common input source and transfer information down the S-Bus to all TEs . All NT devices connected into the star will receive the information transmitted by all TEs on all branches of the star, exactly as if they were on the same physical S-Bus. All NTs in the star configuration must be operating in fixed timing mode. Refer to the description of the star configuration in the ST-BUS section. The SNIC has one last mode of operation called the NT slave mode. This has the effect of operating the SNIC in network termination mode (XTAL1/NT pin = 1) but having the frame structure and registers description defined by the TE mode. This can be used where multiple subscriber loops must carry a fixed phase relation between each line. A typical Figure 11 - ST-BUS Stream Format Figure 12 - Clock & Frame Alignment for ST-BUS Streams Channel 0 Channel 1 Channel 2 Channel 30 Channel 31 Channel 0 ••• Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (8/2048) ms 125 µs F0b C4b ST-BUS BIT CELLS Channel 31 Bit 0 Channel 0 Bit 7 Channel 0 Bit 6 Channel 0 Bit 5 Channel 0 Bit 4 |
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Similar Description - MT8931CE |
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