The external overhead results from the data that the modem attaches to each packet. For PPPoE connections, this is 4 bytes for the LLC header and 8 bytes for the AAL 5 trailer. The modem cannot send "partial" ATM cells, so on average half an ATM cell (= 24 bytes) must be allowed for additionally. The resulting total overhead is thus 36 bytes per transmitted packet.
Telnet path:/Setup/Interfaces/DSL/Ext.-Overhead
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