ACC Release Notes for the B.03.01 Release

Advanced Communications Controller Release Notes for the B.03.01 Release

Major Enhancements and New Features

dynamically conﬁgured using zonﬁg() timeslot zero can only be

assigned to subchannel zero, otherwise a status code

(PT_BAD_TS) will be returned.

• ttgen now reports an error if timeslots 25 to 31 inclusive are

assigned to a subchannel when the port is conﬁgured in Tmode.

ttgen also reports an error if timeslot zero is assigned to a

subchannel in any port mode. ttgen does allow a subchannel to

be deﬁned with no timeslots assigned to it. This may be used

for terminals which do not interact with the physical network,

and do not need to be associated with any particular timeslot

on the port.

ACC Protocol Enhancements

• The X.25 protocol has been enhanced to fully support

end-to-end acknowledgment of X.25 data packets with the

D-bit set to 1. New ZX25 API calls, as noted above are required

to take full advantage of this new functionality at the low-level

ZX25 API. When using X.25/9000 with the ACC software, the

end-to-end acknowledgment handling of data packets with the

D-bit set to 1 is disabled by default at installation to preserve

compatibility in behavior with previous ACC software releases.

To enable this functionality under X.25/9000, you can add the

following line to the /stand/system ﬁle and rebuild the kernel.

n2z_end_to_end_acks 1

• The HDLC/LAP-B protocol and the X.25 protocol at level 2

have been enhanced to support optional operation with modulo

128 extended sequence numbering. If selecting this option with

the Z7200A, Z7350A or Z7400A ACC interface cards, care

should be taken not to choose a large window size which may

cause the ACC card to run short of buffers.

Enhancements in Utilities

• zmlog can support negative message priority. The message

priority speciﬁed in the message text ﬁle ranges from -128 to

127. Since the default minimum display priority in zmlog is

zero (0), zmlog by default will not display messages with

negative priority. Use the -p option to change the display

priority level if necessary. This feature allows unwanted