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Chapter 7. Protocol Options
50 ISU 128 User Manual 61202.029L2-1
TXADD01
This option specifies the length of time both endpoints wait for the additional
call to be connected at the end of negotiation before deciding the BONDING
call has failed. The factory default setting of 20 seconds will be sufficient for
most calls to go through, although when dialing overseas it may be necessary
to lengthen this timer to allow for slower call routing. Values of 1, 2, 5, 10, 20,
50 (default), 100, and 200 seconds may be selected.
TXDEQ
This option specifies the length of time both endpoints attempt to equalize the
network delay between the bearer channels before deciding the BONDING
call has failed. The default setting is 50 seconds. Values of 1, 2, 5, 10, 20, 50
(default), 100, and 200 seconds may be selected.
TANULL
This option specifies the length of time the answering endpoint attempts to de-
tect the BONDING negotiation pattern from the originating endpoint before
aborting to clear channel mode. In general, this timer value should be left at
the factory default setting of 10 seconds. However, it may be necessary to
shorten this timer, if the DTE equipment connected to the ISU also has timer
constraints for completing non-BONDING parameter negotiation. Values of
1, 2, 5, 10 (default), 20, 50, 100, and 200 seconds may be selected.
TCID
This option specifies the length of time both endpoints attempt to negotiate an
agreeable value for bearer channels and channel capacities before deciding the
BONDING call has failed. This timer default setting is 5 seconds. Values of 1,
2, 5 (default), 10, 20, 50, 100, and 200 seconds may be selected.
V.120
The V.120 protocol is a CCITT compliant rate adaption method which pro-
vides DTE service between the ISU 128 and other V.120 compliant devices at
rates less than the 64 kbps ISDN bearer channel rate. V.120 supports synchro-
nous and asynchronous DTE rates. See the section Recommended Operating
Modes and Table 1-B in Chapter 1 for available V.120 rates. Figure 7-2 illus-
trates the menu path for selecting V.120.