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MT8926AP Datasheet(PDF) 6 Page - Mitel Networks Corporation |
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MT8926AP Datasheet(HTML) 6 Page - Mitel Networks Corporation |
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6 / 26 page  4-8 MT8926 Figure 5 - CSTo Channel Allocation Versus T1 Channels CSTo 0-2 PCSW 3 PS W 4-6 PCSW 7 PM SW 8-10 PCSW 11 CRC 12-14 PCSW 15 MS W1 16-18 PCSW 19 EF EC 20-22 PCSW 23 BPV 24-26 PCSW 2 27 Rx BOM 28-30 PCSW 31 MS W2 T1 1-3 4-6 7-9 10-12 13-15 16-18 19-21 22-24 Cyclic Redundancy Check-6 Error Counter Bit 7-5 4 Function Not Used LLDD (001) Bit 7 0 Function Received First LSB PCSW = Per Channel Status Word PMAC Miscellaneous Status Word Master Status Word 1 Errored Frame Event Counter Bit 7-4 3-0 Function SE (MSB-LSB) FE (MSB-LSB) LLED (00001) FECV TMR (2SEC) BOMV 3 2 1 0 Received Bit-Oriented Message Register Bipolar Violation Counter Master Status Word 2 Bit Function 7MSB 0 Received Last Bit 7* Function YLALR Bit 0 Function LSB 7MSB 6* 5 4 3* 2 1* 0* MIMIC ALRM RAI (ESF YELLOW) MFSYNC LOS SLIP SYN Bit 7* Function BlAlm 6* 5* 4 3 2 1 0 FrCnt Xst SEI FSI CSI BSI AIS PSW = Phase Status Word * MT8976/77 Data unaltered by the MT8926 connects to DSTi1 of the PMAC and to the receive side of the system. This allows the PMAC to perform a payload loopback by internally connecting DSTi1 to DSTo. In normal operation, transmit data will flow from DSTi0 to DSTo of the PMAC to DSTi of the MT8976/77. PMAC RESET The MT8926 functions may be suspended by making the RESET input low (RESET must be high for normal operation). In the reset state, data entering the PMAC on FDLi, DSTi0 and CSTi0 will pass through unaltered to FDLo, DSTo and CSTo respectively. E8Ko will be high, IRQ will be high impedance and the 1SEC output (and TMR bit) will be low. After the MT8976/77 has acquired frame synchroni- zation and RESET returns high, the MT8926 will require two superframes to acquire synchronization and two ST-BUS frames to align to the ST-BUS. RESET can be used to prevent DS1 interface Figure 6 - Payload and Line Loopback Operation Repeating 001 Repeating 00001 ST-BUS Transmit Data Stream ST-BUS Receive Data Stream To PMAC Control 4 to 1 MUX CSTi1 DSTo LCW DSTi0 DSTi1 From System Control CSTi1 DSTi DSTo TxB TxA RxA RxB ECLK MT8976/77 MT8926 LCW = Loopback Control Word LCW 0 0 0 1 1 0 1 1 Function DSTi0 to DSTo DSTi1 to DSTo 00001 to DSTo (activate) 001 to DSTo (deactivate) |
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