
as SP, Grafik Packet and ESKAY, some of which make use of the KISS mode
feature of the TNC.
To use the DAMA system, the user connects to the DAMA master with a normal
connect frame. When the master responds to the connect frame, the TNC is auto-
matically placed into DAMA slave mode. The DAMA master polls each slave
within the LAN in a “round-robin” fashion (somewhat like the token passing
method) and the slave TNCs transmit packets when the master has granted per-
mission to do so. The slave TNCs continue to be polled with priority among the
slaves assigned according to the number of times each responds with information
frames (as opposed to rr frames - i.e., no data to send). Priority is dynamically
assigned so that those stations that are sending information are polled more fre-
quently than idle stations. However, once an “idle” station responds with infor-
mation, its priority is upgraded.
Communication over the wider area is handled between the DAMA master nodes
which are connected to each other using a standard NET/ROM
™
type protocol.
For the DAMA system to work effectively, each slave associates with only one
master node and connects only to that master. If an end user is connected to
more than one master,
each
master will poll the slave TNC according to its poll-
ing schedule. When polled, the slave TNC will transmit
all
frames it has avail-
able to whichever master polls it. This would increase the probability of
collisions with other users, thus defeating the purpose of the DAMA system.
How is DAMA Implemented in Kantronics TNCs?
Most Kantronics TNCs, including the KPC-3 Plus, KPC-9612 Plus, and the
KAM Plus, implement the DAMA slave mode, using the following commands
(see the Command Reference section for details):
DAMA {ON|OFF}
Set DAMA to ON to have your Kantronics TNC operate as a DAMA slave sta-
tion once a connection is established with a DAMA master station. When
DAMA is OFF, the TNC will operate in it’s carrier sense multiple access mode
(CSMA). For details, see the CD, SLOT, and PERSIST commands in the Com-
mand Reference section of this manual.
Packet Modes of Operation
Other Modes of Operation
User’s Guide
216
KAM’98 v 8.3
Содержание KAM 98
Страница 4: ...User s Guide ii KAM 98 v 8 3...
Страница 18: ......
Страница 132: ...Getting Started Other Topics User s Guide 114 KAM 98 v 8 3...
Страница 160: ...blank page Non Packet Modes of Communication RTTY Operation User s Guide 142 KAM 98 v 8 3...
Страница 342: ...blank page Command Reference KAM 98 Commands User s Guide 324 KAM 98 v 8 3...
Страница 376: ...ASCII Chart paste in page 1 of 2 ASCII chart Appendix E Additional Information ASCII Chart User s Guide 358 KAM 98 v 8 3...
Страница 378: ...KAM 98 Parts Layout Appendix E Additional Information KAM 98 Parts Layout User s Guide 360 KAM 98 v 8 3...