In Application-to-Person (A2P) text messaging, throughput describes how many SMS & MMS messages you are sending within a specific period of time. It is often referred to as throughput per second, or TPS.

Throughput Limits (AKA Rate Limits) are determined by the sender ID (short code, 10-digit long code, toll-free, etc.)

In the case of 10DLC numbers, your Throughput / Rate Limit is determined by your TCR-approved Campaign use-case.