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The Packet Size and Window Size parameters directly affect data flow across a virtual circuit. By increasing the packet and window sizes in any direction of a call, you can increase the throughput of data across the circuit.
Recall that packet size is the maximum number of data bytes allowed in the user data field of a packet. PDNs have a default packet size of 128 bytes. A DTE can select a nonstandard default packet size ranging between 16 and 4,096 bytes.
The window size is the maximum number of unacknowledged packets that can occur in a call, usually between 1 and 7. A large window size improves network efficiency because fewer acknowledgment packets need to be sent. The standard default window size is 2. A DTE can select a nonstandard default window size from 0 to 7.
Some networks might require that the default packet and window size be the same for each data flow direction. Values other than the default can be negotiated using the Flow Control Parameter Negotiation facility.
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