This read-create Integer32 (10-25000 milliseconds) sets how long this specific Frame Relay over IP transport waits for a window acknowledgement before considering it lost, overriding the group default. An admin raises this for a transport running over a particularly high-latency IP path, so normal delay isn't mistaken for packet loss. For example, a transport carried over a congested WAN link with variable latency spikes would need this timeout increased above the group default to avoid unnecessary retransmissions.