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Chapter 7. Protocol Options
61202.029L2-1 ISU 128 User Manual 55
When originating calls to unknown units, the ISU begins protocol selection
based on the local call type. Data 64k is used for FALLBACK selected from
Quick Setup menu. Upon connection at 64k call type, BONDING, V.120, and
PPP are attempted. If connection is not made at 64k, the ISU 128 attempts an-
other call at 56k call type. If connection is made at 56k, then V.120, T-Link, and
PPP are attempted. If connection is not made at 56k, then an audio call type is
attempted, provided the ISU 128 with the V.34 modem option is used. If the
ISU connects the audio call type, the V.34 protocol is attempted for V.34 com-
patible modems. Once a call connects, if the protocol cannot be negotiated, the
protocol is negotiated as specified by S11 register (default is DSTOP). If this
protocol fails, the call is disconnected.
If FALLBACK fails to determine which protocol is running, the user has the
option to select which protocol will run. Figure 7-6 illustrates the FALLBACK
default settings.
Figure 7-6
FALLBACK Menu Tree
3=CONFIG
1=Netw. options
2=DTE options
3=Protocol
4=Quick setup
5=Remote config
1=Clear Channel
2=BONDING mode 1
3=V.120
4=V.34
5=V.110
6=DSU 57.6 ASYNC
7=T-LINK
8=SAP
9=FALLBACK
0=PPP asyn-sync
1=Fallback Def.
1=Clear Channel
2=BONDING Mode 1
3=V.120
4=V.34
5=V.110
6=DSU 57.6 ASYNC
7=T-LINK
8=SAP
9=PPP asyn-sync