The Packet Radio
“
2 N 1
”
Handbook
by
Buck Rogers
K4ABT
Section 1
;
Packet Radio “The Basics
”
Section 2
;
The X1J4 System Node Operator’s (SNO) Handbook
Section II
;
TheNET X1J4 System Node Operators Handbook
__ Page 25
THE FOLLOWING ARE DEFINITIONS OF TERMS DEFINITIONS ASSOCIATED WITH THE X1J4 NODE:
•
DIGIPEATER
- A station capable of digitally repeating AX.25 frames as specified in the AX.25 protocol
specification. Generally, refers to an unattended, wide-coverage digital repeater, often located on a hilltop.
•
NODE
- A packet radio station utilizing TNC2 hardware and implementing an EPROM that contains the
theNET
X1
firmware. In most applications, this refers to an unattended, wide-coverage station located at high
elevations such as a hilltop, mountain, tall-tower, local water supply tower, or high-rise building.
•
SYSOP -
The node
SYS
tem
OP
erator, or the Network MAnager who performs administrative configuration of
the X1 node.
•
USER
- Any amateur packet radio station using AX.25 protocol. In the context of this document, a BBS or
other automated server is considered a "user".
•
DUAL
-
FREQUENCY
Node - A pair of TheNET
X1
nodes operating on two different frequencies, and
coupled together by means of an RS232 cable.
•
MULTI
-
FREQUENCY
Node - Three or more TheNET
X1
nodes operating on different frequencies, and
interconnected via their RS232 ports using a diode-matrix coupler.
•
LINK
- An AX.25 connection involving a node at one or both ends. Node-to-node links always use AX.25v2
protocol. User-to-node links use AX.25v2 protocol if the user's TNC supports it, otherwise AX.25v1.
•
UPLINK
- An AX.25 connection between a user and a node, initiated by the user. An uplink is usually a
direct connection, but may be digipeated if necessary.
•
DOWNLINK
- An AX.25 connection between a node and a user, initiated by the node. A downlink is usually
a direct connection, but may be digipeated if necessary.
•
CROSSLINK
- An AX.25 connection between two adjacent nodes. A crosslink is usually a direct connection,
but may be digipeated if necessary. A crosslink between two nodes is initiated by one of the nodes when first
establishing a circuit which traverses the route segment between the two nodes.
•
LOCKED ROUTE -
A path or route that has been installed into the route and/or node table of a TheNET
node. This method of route control presents the node sysop with a means of “locking” routes between nodes.
Locking routes also serves as a safeguard that assures the sysop that the nodes will use the same route(s)
regardless of atmospheric conditions or “lift” propagation.