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Monday, August 8, 2011

UTP Vendor Alert #2011 - 2
UTP SIP Reminds Firms of Message Sequence Reset Procedures

Products Impacted:

  • UTP Quotation Data Feed (UQDF)

Contact Information:

What you need to know:

  • Given today’s extraordinary market conditions, the UTP Securities Information Processor (SIP) processed more than 92.5 million quotations on the UTP Quotation Data FeedSM (UQDFSM) Channel 6 (NASDAQ-listed symbols S to Z) during normal market hours.
  • As outlined in the UQDF data feed specifications, the UTP SIP has a message sequence number limitation of 99 million quotation updates per channel per day.
  • If the UTP SIP processed more than 99 million messages for a single data channel, it would need to exercise the sequence number reset procedures as outlined in the UQDF specification document.
    • When the UQDF message sequence number hits 99 million, the UTP SIP will disseminate a Category C – Type L reset event message on the affected UTP data channel.
    • Following the reset event, the UTP SIP will restart its message sequence number count to zero for the affected channel.
    • Please note: The UTP SIP will be unable to process retransmission requests for data sent prior to the reset event.