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Configuring GAL Settings

Overview

You can configure various TT Gateway behaviors using certain GAL settings. Most GAL settings in aconfig_local.xml are extremely sensitive, and TT recommends that you never change them. However, depending upon your environment and trading needs, you may need to change the following parameters.

Each TT Gateway install with settings unique to its gateway type. For details on default settings, refer to the SAM specific to the TT Gateway you use.

GAL Setting Parameters

GAL Parameters

Location: AConfigCoreServerExchange-SpecificExchange-flavorGAL

Parameter

Description

Last-Traded-Quantity

Function: Sets whether the TT Gateway should accumulate the Last Traded Quantity at Price (LTQ). Available settings include:

  • 0: Accumulate LTQ. The TT Gateway keeps a count of all consecutive trades that occur at the same price. The Price Server sends this information with its price updates.
  • 1: Do not accumulate LTQ. The TT Gateway only sends price information relevant to the last trade.

For example, when set to 0: A three-lot update comes in at a price of 10. Another update comes in with 4 lots at 10. The Price Server sends a LTQ of 7 at 10.

Default Setting: When the GAL setting has no value or an incorrect value assigned to it, the TT Gateway behaves as if set to 0.

Implicit-Spread-Prices

Function: Sets whether the TT Gateway provides implieds for spreads. Available values include:

  • 0: The TT Gateway does not provide implieds for spreads.
  • 1: The TT Gateway provides implied for spreads and merges them into the inside market best bid and ask prices and quantities
  • 2: The TT Gateway provides implied for spreads but does not merge them into the inside market best bid and ask prices and quantities

Default Setting: When the GAL setting has no value or an incorrect value assigned to it, the TT Gateway behaves as if set to 0.

Warning

Do not change the default value of this parameter unless instructed to do so by TT support.

Implicit-Outright-Prices

Function: Sets whether the TT Gateway provides implieds for outright prices. Available values include:

  • 0: The TT Gateway does not provide implieds for outrights.
  • 1: The TT Gateway provides implied for outrights and merges them into the inside market best bid and ask prices and quantities
  • 2: The TT Gateway provides implied for outrights but does not merge them into the inside market best bid and ask prices and quantities

Default Setting: When the GAL setting has no value or an incorrect value assigned to it, the TT Gateway behaves as if set to 0.

Warning

Do not change the default value of this parameter unless instructed to do so by TT support.

Market-Depth

Function: Sets whether the TT Gateway provides aggregate or detailed market depth.

  • 0: The TT Gateway does not support Market Depth
  • 1: The TT Gateway supplies aggregate Market Depth
  • 2: The TT Gateway supplies detailed Market Depth

Default Setting: When the GAL setting has no value or an incorrect value assigned to it, the TT Gateway behaves as if set to 0.

Warning

Do not change the default value of this parameter unless instructed to do so by TT support.

Non-Tradable-Prices

Function: Sets whether the TT Gateway may display off-tick prices.

  • 0: The TT Gateway displays prices that adhere to normal ticking
  • 1: The TT Gateway display both normal and off-ticking prices

Default Setting: When the GAL setting has no value or an incorrect value assigned to it, the TT Gateway behaves as if set to 0. TT LIFFE, and Euronext Gateways install with Non-Tradable-Prices=1.

Warning

Do not change the default value of this parameter unless instructed to do so by TT support.