This OID stores the count of successfully transmitted ATM cells on an IP-over-ATM service connection, tracking the lower 32 bits of a 64-bit counter used for billing purposes. Network engineers monitor this to verify that data is actually leaving the device and to bill customers accurately for traffic sent over the connection. For example, if this counter shows 5,000,000 cells transmitted, it indicates roughly 600 MB of outbound data (since each ATM cell carries 48 bytes of payload).