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PEB2035-P Datasheet(PDF) 29 Page - Siemens Semiconductor Group |
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PEB2035-P Datasheet(HTML) 29 Page - Siemens Semiconductor Group |
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29 / 134 page  Semiconductor Group 29 PEB 2035 Transmitter The serial bit stream is then processed by the transmitter which has the following functions: q Frame/multiframe synthesis of one of the six selectable framing formats q Insertion of service and data link information q Remote alarm generation q CRC generation and insertion of CRC bits Note: As addition in PCM 24 mode, all CRC bits of one outgoing extended multiframe are inverted in case a CRC error is flagged for the previous received multiframe (function is enabled via bit GCR.CRCI). In PCM 24 mode, the transmitter of the ACFA can be synchronized externally for multiframe begin (port XCHPY, bit ACR.EXMF). This feature is required if the bit-robbed signals are routed through the switching network and are inserted in transmit direction via the system interface. Transmit Link Interface Similar to the receive link interface two different data types with selectable output sense are supported: q Dual rail data (PCM[+], PCM[–]) at ports XDOP, XDOM with 50 % or 100 % duty cycle (bit EMOD.XFB) transmitted to a line interface unit, e.g. PEB 2235, Siemens ISDN Primary Access Transceiver, IPAT. Single rail data is converted into a dual rail bit stream. In PCM 30 mode, the HDB3 line code is employed. In PCM 24 mode, selection between B8ZS or simple AMI coding with zero code suppression (B7 stuffing) is provided. B7 stuffing can be disabled on a per channel basis (clear channel capability). q Unipolar data at port XOID (PCM 30) or at port XDOP (PCM 24) with 100 % duty cycle transmitted to a fibre optical interface. Clocking off data is done with the positive transitions of the transmit route clock: XRCLK (2048 kHz or 1544 kHz). In PCM 30 mode, XRCLK is generated by the ACFA, whereas in PCM 24 mode it must be generated by an external clock generator. Additionally, the dual rail outputs XTOP and XTOM are provided for test applications. |
Similar Part No. - PEB2035-P |
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Similar Description - PEB2035-P |
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