CCBSTATE Table

A binary table extension called CCBSTATE records the physical definitions of the phases of the data. There are a number of rows equal to the number of phases NPHASES returned for each CCB input port for each integration.

Columns PHIA and PHIB records the values of the phase switches A & B at each phase state. Valid values are 0 or 1. Data type of each entry in the column is an unsigned byte.

The ordering of rows in the CCBSTATE table corresponds to ordering of the phase columns in the DATA table. The number of rows in the CCBSTATE table is equal to the number of phases in the phase switch cycle (which is in turn equal to 2 to the power of the number of active phase switches- hence 1,2, or 4). The number of phases in the phase switch cycle is referred to as NPHASES elsewhere in this docuemt.

Comments

• NPHASES is equal to $2^{NACTPSW}$ where NACTPSW is the number of active phase switches. Since NACTPSW has valid values of 0, 1, and 2, NPHASES can be 1, 2, or 4.

• This table is analagous to GBT Backends' STATE tables but differs due to the different implementations of CALs (individual integrations are Cal On or Cal off, rather than having sub-integrations or "phases" be Cal On or Cal Off as for other GBT backends) and SIGREF (next bullet point) for this backend.

• The REF state corresponds to "PHIA XOR PHIB". A SIG state is "NOT(PHIA XOR PHIB)". With two phase switches active there will be two physically distinct rows of the CCBSTATE table that correspond to SIG and two that correspond to REF.