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Models IC and SIC
Wrap Feature: Determine whether the modem permits data to be wrapped under control
of the 3274 Control Unit or whether the modem has a switch to control the wrap
function. If the modem has the wrap capability and wrapping can be controlled from the
3274 Control Unit, it is recommended that this method be used.
If you are unable to determine that your modem has the wrap option activated, enter a O.
However, note that this may require you to recustomize at a later date if you determine
later that the modem does have the wrap option activated and you wish to use the wrap
capability.
313 NRZI (SDLC Only) or NRZ Encoding
Enter a 0 if NRZ (non-return to zero) encoding is used or a 1 if NRZI (non-return to zero
inverted) encoding is used.
l
313 (BSC only) Internal or External Clocking
Enter a 0 if the business machine clock is provided externally and feature #6301 is
not
installed.
Enter a 1 if the business machine clock is provided externally and feature #6301 is
installed.
314 Multipoint or Point-to-Point Network
Enter a 0 if the 3274 is part of a multipoint network or a 1 if it is part of a point-to-point
network.1
317 Nonswitched- or Switched-Network Backup
Enter a 0 if the modem does not have switched-network backup (SNBU) capability. If the
modem does have SNBU, enter a 0 to cause the modem to operate in nonswitched mode
or a 1 to cause the modem to operate in switched mode)
If the modem does have this capability, determine whether this capability can be
controlled externally by the 3274 or at the modem.
It
is recommended that this
capability be controlled by the 3274.
Notes:
1. In the U.S. and Canada a switched network attachment requires the use of a
protective device. This must be ordered from an OEM communication equipment
supplier and installed separately.
2. To have the capability to operate in either nonswitched or switched network backup
mode, two system diskettes may be generated (as described in Chapter
6),
one for
each type of operation. To change modes, select the other system diskette and
perform IML procedures. Ensure that the diskettes are appropriately labeled.
318 Normal or Half-Speed Transmission
Enter a 0 if the modem does not have half-speed transmission capability or if full-speed
transmission capability is desired. Enter a 1 if half-speed transmission operation is desired.
If
the modem has half-speed transmission capability, determine whether this capability
can be controlled externally by the 3274 or by a switch on the modem. If the capability
can be controlled by a switch on the modem, it is recommended that a 0 be entered and
that the switch be used.
l
lThis parameter must be compatible with the host system communications
controller and/or the modem.
Chapter 3. Preparing to Customize
3-25
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