Specifications

5-2

System Command Reference Section

Pattern Configuration

In an instrument containing pattern generator and error detector modules the pattern

configuration in the generator and detector is coupled and hence need only be configured

once using either the SOURCE1:PATT or SENSE1:PATT commands. In generator only

instruments the SOURCE1:PATT form must always be used while in detector only

instruments the SENSE1:PATT form is mandatory.

This coupling of the pattern configuration includes configuration of alternating user

patterns although the detector will always use pattern B as the reference for comparison to

the incoming data.

The coupling does not apply in 2 functional groups; control of the generator’s switching

between pattern A and pattern B of an alternating user pattern (configured with the

SOURCE1:PATT:APCH commands) and control of the generator’s error addition

functions (via the SOURCE1:PATT:EADD commands).

In all other cases, within the provisos of the preceding paragraphs, the SOURCE1 and

SENSE1 root keywords may be used interchangeably when controlling the instrument’s

pattern configuration.

[SOURce[1]:]PATTern[:SELect] <character data>

This node defines the type of pattern being generated. The <character data> is one of:

PRBS<n> <n> = 7,10,15,23 or 31

ZSUBstitut<n><n> = 7,10,11, or 13

MDENsity<n> <n> = 7,10,11, or 13

UPATtern<n> <n> 0,1,2,3,4,5,6,7,8,9,10,11, or 12

ZSUBstitut is a contraction of the phrase: Zero SUBstitution and is used for defining

patterns in which a block of bits is replaced by a block of zeros.

MDENsity is a contraction of the phrase: Mark DENsity and is used for defining a pattern

in which the density of marks may be set by the user.

UPATtern<n> is a contraction of the phrase: User PATtern andisusedtodefinethe

contents of a pattern store. The value <n> must be in the range 0 through 12.

The commands under this node affect the storage of information as defined as follows:

<n> = 0 Current pattern

<n> = 1 thru 4 Non-volatile RAM storage

<n>=5thru12 Diskstorage