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MT90710AP Datasheet(PDF) 9 Page - Mitel Networks Corporation |
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MT90710AP Datasheet(HTML) 9 Page - Mitel Networks Corporation |
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9 / 12 page  Preliminary Information MT90710 5-11 Fiber to ST-BUS When ST6MUX is enabled the STo6A and STo6B output streams are comprised of the demultiplexed information received from the fiber link. The received data is duplicated on two channels since the ST-BUS channels support twice the bandwidth of the data from the incoming fiber link. See Table 2. When ST6MUX is disabled the STi6B and STo6B ports are not operational. The STi6A and STo6A ports operate as clear 2.048 MHz links in the same manner as STi/o links 0 to 5. Fiber Loop Synchronization A receiver is declared in synchronization after detection of three consecutive frames containing a valid sync pattern. Once synchronized a receiver will lose sync if a valid sync pattern is not detected in two of four consecutive frames (refer to Figure 5). LED Control The open collector RLED output (pin 36) will cause an LED, pulled up to +5 volts, to flash at approximately a 4 Hz rate when the far-end is out of synchronization but the near-end is synchronized. If the near-end is not synchronized this output is inactive. The open collector LLED output (pin 70) will cause an LED, pulled up to +5 volts, to flash at approximately a 4 Hz rate when the near-end is out of synchronization. Checksum Generator Checksum = Where i-1 is the carry out from the previous operation. The checksum is calculated on all 255 channels except on channel 0 where the frame synchronization code is transported. During this channel the previous checksum is stored and the register initialized for the next calculation. DATAi Ci 1 – + i 1 = 255 ∑ INCORRECT SYNC SET SYNC = FALSE CORRECT SYNC SET SYNC = FALSE CORRECT SYNC SET SYNC = LAST STATE INCORRECT SYNC SET SYNC = LAST STATE CORRECT SYNC SET SYNC = TRUE CORRECT SYNC SET SYNC = TRUE INCORRECT SYNC SET SYNC = TRUE INCORRECT SYNC SET SYNC = FALSE STATE 0 STATE 1 STATE 2 STATE 3 Figure 5 - State Diagram |
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