NEC UNIVERGE SV9100 Manual page 133

2. The packet size exceeds the minimum size
3. 120mS after the previous packet was sent
Buffering operation can reduce the network load by grouping together smaller packets until the minimum
size is exceeded, therefore sending a smaller quantity of larger packets.
However implementing the Buffering operation can cause problems when sending DTMF digits via a
NetLink connection. For example to a remote analogue trunk: DTMF digits must be sent immediately.
To ensure DTMF digits are sent immediately the SV9100 with R9 Main Software will ensure the data packet
exceeds the minimum size.
Wi za rd – Ad va n ce d I te m s/Vo I P/Networking/N e tl i n k /N e tl i n k Pri m a ry Se tti n g s/Si g n a l Tra n sm i t
Me th o d (5 1 -0 1 -0 4 ) - (0=Immediate, 1=Buffered) default = Buffered
a) With Buffered operation the SV9100 will use the Nagle Algorithm to improve transmit efficiency
and only send the data packets when one of the following conditions are met:
1. The previous packet has been acknowledged
2. The packet size exceeds the minimum size
Packet size is larger than MSS (Maximum Segment Size)
3. 120mS after the previous packet was sent
b) CMD51-01-04 must be enabled at the Primary and Secondary systems as it can only process
Part 2: VoIP Manual 133