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Chapter 7. Protocol Options
61202.029L2-1 ISU 128 User Manual 51
V.110
The V.110 protocol is a CCITT compliant rate adaption method which pro-
vides DTE service between the ISU 128 and other V.110 compliant devices.
V.110 supports synchronous and asynchronous DTE rates. See the section
Recommended Operating Modes and Table 1-B in Chapter 1 for available V.110
rates. Figure 7-2 illustrates the menu path for selecting V.110.
V.34
The V.34 protocol allows the ISU to originate and receive calls to analog mo-
dems on POTS lines. The V.34 modem only supports asynchronous DTE rates.
To place an outgoing call to an analog modem, the call type must be changed
to Audio. See Call Type in Chapter 6 to change call types. Figure 7-3 illustrated
the menu path for selecting the V.34 modem operational parameters.
The ISU 128 with optional V.34 modem (part number 1202029L3) must be used for
operation of this protocol.
Error Control
This option sets the type of error control to be negotiated with the far-end mo-
dem during train-up. Normal turns all error control off and makes allowances
for flow control. Reliable MNP uses MNP error control. If the far end does
not support MNP then the call is terminated. When Auto-Rel MNP is select-
ed, the ISU 128 attempts to use MNP error control. If the far end does not use
MNP then normal operation is used. Force LAPM allows only LAPM (V.42)
error corrected calls to connect. Force MNP allows only MNP error corrected
calls to connect.
Figure 7-3
V.34 Error Control 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=Error Ctrl
2=Compression
3=MNP Blk Size
1=Normal
2=Direct
3=Reliable MNP
4=Auto-Rel MNP
5=Force LAPM
6=Force MNP