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TN211-14.DOC
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1993-08-09
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TN211_14.DOC
SYSOP REMOTE PARAMETERS (12-16)
***********************************
Parameter 12, TXDELAY
---------------------
Node radio TXD is adjustable in 10 ms increments. The value selected
should be based both on the node's T/R capability and on the ability of the
worst case radio in the link to respond. Factors influencing response and
approximate times are:
1. 2 - 20 ms to overcome receive squelch (if squelched).
2. 2 - 5 ms for switched crystal oscillators to settle.
3. 10 - 50 ms for older mechanical T/R relays to switch.
4. 5 - 10 ms for modern reed relays to switch.
5. 350 ms for PLL circuits to switch and settle.
Other than recommending users to upgrade their radios, a LAN NodeOp has little
control over user radio TXD's. This being the case, the suggested TXD for a
LAN node is "30" (300 ms). If certain users experience repeated retries, than
TXD should be bumped higher, as necessary. Radios selected for backbone use
should be faster responding and TXDs can be set accordingly.
(Range: 0-255)
Parameter 13, BROADCAST VIA PORT
--------------------------------
Under certain networking configurations, it's desirable to control whether
the NODES broadcast will be allowed or not, over the RS-232 and the HDLC radio
ports. A typical example would be an isolated LAN node where NODES broadcasts
over the radio port would just add QRM to the channel, since there are no other
nodes to receive them. Another example would be an access node not wanting to
advertise its presence onto a backboned trunking system. In this case the
broadcast would be blocked via the RS-232 port. Even though broadcasts are
inhibited, it doesn't prevent reception of broadcasts from other nodes.
0 = broadcasts via NO ports, 1 = broadcasts via HDLC radio port only, 2 =
broadcasts via RS-232 port only, 3 = broadcasts via both ports.
(Range: 0-3)
Parameter 14, # PROPAGATE
-------------------------
A portion of the node-to-node overhead is taken up with the inclusion of
# hidden nodes in the NODES broadcasts. In large backboned trunking networks,
the # hidden nodes can contribute significantly to network clutter. Since the
status of the # hidden nodes are typically of interest only to local NodeOps,
it would be desirable to limit their propagation into the system. Suggested
value is "0." 0 = OFF, no propagation, 1 = ON, allowed to propagate.
(Range: 0-1)
Parameter 15, CONNECT COMMAND ENABLE
------------------------------------
A factor enhancing improved throughput on backboned trunking systems is
the lack of collisions due to allowing (in the most modern of systems) only
ONE transmitter per link frequency. This configuration can be maintained
simply by disallowing connected users to issue a CONNECT command FROM the
protected node. User connect attempts will be quietly ignored. Transport
layer 4 connect requests from adjacent nodes are not affected and are serviced
in the normal way. With exception of the special case mentioned, the suggested
value is "1". 0 = CONNECT command disabled, 1 = CONNECT command enabled.
(Range: 0-1)
Parameter 16, DESTINATION LIST LENGTH
-------------------------------------
Limits the maximum number of nodes, both hidden and non-hidden, that will
accumulate in the ROUTING table. This table contains an alphabetical listing
by alias of distant (destination) nodes picked up during neighbor node(s)
broadcasts. This is the same listing a user sees in response to a NODES
command. The term "Destination" implies a user is able to make a single
connect to any of the nodes listed in the 'destination table'. With each node
listed, the amount of "free buffers" within the node's memory space is reduced
by 36 bytes. Depending upon the number of nodes in the table, the node's
memory could become temporarily depleted. Should this happen, the response
to certain commands will be "Node busy". The number of free buffers is
shown in parenthesis during the USERS command response.
Free buffer depletion is not normally a problem with the typical node when the
maximum table size is limited to 100. If the Minimum Quality for Update,
parameter 1, is sized to limit the number of nodes to those that are
"connectable", the NODES table will normally contain far fewer than the 100
limit. Suggested value is "100".
(Range: 1-400)