# :FUNCtion:SNDRatio:RLMStandard

:FUNCtion SNDR Setup Commands

- :FUNCtion:SNDRatio:FILE:NAME
- :FUNCtion:SNDRatio:FILE:RELoad
- :FUNCtion:SNDRatio:LFPDelay
- :FUNCtion:SNDRatio:LFPLength
- :FUNCtion:SNDRatio:NAVerages
- :FUNCtion:SNDRatio:PUINterval
- :FUNCtion:SNDRatio:RLMStandard
- :FUNCtion:SNDRatio:RNComp
- :FUNCtion:SNDRatio:RNCValue:LEVel
- :FUNCtion:SNDRatio:SAVE
- :FUNCtion:SNDRatio:SAVE:FILE
- :FUNCtion:SNDRatio:STANdard

## Command Syntax

    :FUNCtionN:SNDRatio:RLMStandard {RLMA120 | RLMC94 | EYE}

Where N identifies one of sixty four {1:64} math functions that you can create. For example, `:FUNCtion2`.

## Query Syntax

    :FUNCtionN:SNDRatio:RLMStandard?

## Description

For PAM4 and PAM3 signal type (see `:FUNCtion:SIGNal:TYPE`) SNDR measurements, this command selects the RLM measurement calculation algorithm to use.

This PAM4 symbol levels picture identifies the voltage levels used in the following equations.

RLM Standards
Parameter | Available with signal types | Description
--- | --- | ---
RLMA120 | PAM4 | RLM (IEEE 802.3 Annex 120D) — The linearity is defined as a function of the mean signal level transmitted for each PAM4 symbol level. In the following equations, the term ES stands for the Effective Symbol Level.
RLMC94 | PAM4, PAM3 | RLM (IEEE 802.3 Clause 94). For PAM4: For PAM3, the equation is the same except the V3 is changed to V2 and the division is by 2 instead of 3.
EYE | PAM4, PAM3 | Eye Linearity (CEI 4.0) — Eye linearity is the ratio of minimum eye amplitudes (in Volts) to maximum eye amplitudes (in Volts). For PAM4: For PAM3, the equation is the same except the Eye 2 terms are omitted.