Changes between Version 5 and Version 6 of DP_Formats


Ignore:
Timestamp:
02/01/13 09:54:05 (5 years ago)
Author:
jayce
Comment:

Cleaned up the figures for the packet headers and added links to the references.

Legend:

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  • DP_Formats

    v5 v6  
    1212Figure 1 describes the LWA DRX Output Format. 
    1313 
    14 Figure 1:  DRX Output Format 
    15 [[Image(DRX.png)]] 
     14[[Image(DRX.png, title="Figure 1:  DRX Output Format")]] 
    1615 
    1716The DRX Output will utilize Ethernet (shown in gray), IP ![3] (shown in blue), UDP ![4] (shown in purple), and Mark 5C ![1] (shown in yellow) headers.  The Data Payload size is fixed (4156 bytes) and fits within an Ethernet jumbo packet.  Each data frame will contain data of one polarization (X or Y), one DRX tuning, and 4096 samples.  The Mark 5C header will include an ID field that identifies which polarization and tuning is associated with the data, as described in Table 1. 
     
    4039TBN data will be 16 bits (8 bits each of I and Q). Figure 2 describes the LWA TBN Output Format. 
    4140 
    42 Figure 2:  TBN Output Format 
    43 [[Image(TBN.png)]] 
     41[[Image(TBN.png, title="Figure 2:  TBN Output Format")]] 
    4442 
    4543The TBN Output will utilize Ethernet (shown in gray), IP ![3] (shown in blue), UDP ![4] (shown in purple), and Mark 5C ![1] (shown in yellow) headers.  The Data Payload size is fixed (1076 bytes) and fits within a standard Ethernet packet.  A Data Frame will contain 512 samples or 1024 bytes of complex data (I and Q) from a particular stand (of 260) of one polarization (X or Y).   
     
    6159TBW data will be 12 or 4 bits for each of two polarizations, for a total of either 24 or 8 bits per sample, respectively.  Figure 3 describes the LWA TBW Output Format. 
    6260 
    63 Figure 3:  TBW Output Format 
    64 [[Image(TBW.png)]] 
     61[[Image(TBW.png, title="Figure 3:  TBW Output Format")]] 
    6562 
    6663The TBW Output will utilize Ethernet (shown in gray), IP ![3] (shown in blue), UDP ![4] (shown in purple), and Mark 5C ![1] (shown in yellow) headers. 
     
    8986![1] “Mark 5C Specification,” authored jointly by Haystack and NRAO, available at http://www.haystack.mit.edu/tech/vlbi/mark5/mark5_memos/057.pdf.  February, 2008. 
    9087 
    91 ![2] L. D'Addario, “LWA Memo 151: LWA Signal Delays and Time Tagging.”  December 22, 2008. 
     88![2] L. D'Addario, [http://www.ece.vt.edu/swe/lwa/memo/lwa0151.pdf "LWA Memo 151: LWA Signal Delays and Time Tagging."]  December 22, 2008. 
    9289 
    93 ![3] Postel, J. B., ed. "Internet Protocol," RFC 791. September, 1981. 
     90![3] Postel, J. B., ed. [http://www.ietf.org/rfc/rfc791.txt "Internet Protocol," RFC 791]. September, 1981. 
    9491 
    95 ![4] Postel, J. B. "User Datagram Protocol," RFC 768. August, 1980. 
     92![4] Postel, J. B. [http://www.ietf.org/rfc/rfc768.txt "User Datagram Protocol," RFC 768]. August, 1980. 
    9693 
    9794