Multi-Tech Systems MTA128NT - Manual (Page 43)

PPP/MLPPP
MTA128ST/NT 43
• Ideally, the second channel should be added quickly (short High Threshold Sampling Period [S60] with a
relatively small High Throughput Threshold [S61] ). Also, the second channel should not be disconnected
for a relatively long period of time (long Low Threshold Sampling Period [S62] with a small Low
Throughput Threshold [S63] ).
• If data transmits or is received in bursts and the TA adds and removes a channel too quickly,
– increase the High Threshold Sampling Period (S60) and the Low Threshold Sampling Period (S62)
and
– decrease the Low Throughput Threshold (S63).
Call Bumping (S-register S64)
• Call Bumping is not available to the host TA if Dynamic Bandwidth Allocation is disabled (S59=0) or if the
Dynamic Bandwidth Allocation scheme is PPP (S59=2).
• If the analog device goes off-hook or there is an indication of an incoming analog call and both B-
channels are in use by a data call, the TA drops the second B-channel and rings the analog device.
• If the analog device goes on-hook or the peer disconnects the analog call, the TA adds the second B-
channel again according to whether BOD is enabled or disabled (S60). If BOD is disabled (S60=0), the
second channel is added immediately. If BOD is enabled (S60 is non-zero), the second channel is added
after the High Threshold Sampling Period (S60) and High Throughput Threshold (S61) determine
whether throughput is high enough to allow adding the second channel.