Installation manual

Overview
2
Jabber Lock-up Protection. Jabber lock-up protects the repeater
from being overrun with data packets from a possibly defective
device. That is, jabber lock-up automatically prevents transmitted
data from reaching the repeater if the transmitted data time exceeds
a specified duration (in the range of 20 to 150 ms).
Features Network diagnostics are provided on the front panel of the AT-30xxTR
repeaters, as shown in Figure 1, 2 and 3, to aid in troubleshooting and fault
isolation. Each 10BASE-T network segment has two LEDs, packet “Receive”
and “Port OK.” In addition, there are three central LEDs indicating “Power,”
“Activity,” and “Collision” for the repeater as a whole, and a pair of LEDs
that show “Port OK” or “Receive” state for the AUI and BNC ports.
Each model includes switches that enable manual termination of the BNC
network port and internal signal crossover (MDI/MDI-X) on 10BASE-T Port
#1.
The CentreCOM Multiport Repeaters conform to the IEEE 802.3
specifications. This permits a maximum of four repeaters to be “cascaded”
through one of the 10BASE-T ports and enables up to 1024 individual
segments to be configured into a single network by the extended use of fan-
outs (see Chapter 7 for configuration diagrams).
Figure 1, 2 and 3 show the front panel layouts for the three AT-30xxTR
models:
Figure 1: AT-3012TR
Front Panel
123456 789101112
XXXXX XXXXXX
ACTIVITY
COLLISION
POWER
123456789101112
123456789101112
TERMINATOR
OFF
ON
PORT OK
RECEIVING
PORT OK
RECEIVING
PORT OK
RECEIVING
POWER
10BASE-T NETWORK PORTS 10BASE-T PORT ACTIVITY STATUSAUIBNC
1
2
3
6
1
2
3
6
1
2
3
6
1
2
3
6
MDI MDI-X
IEEE 802.3/ ETHERNET
10BASE-T
MULTIPORT REPEATER
Figure 2: AT-3016TR
Front Panel
XXX XXXX XXXX XXXX
TERMINATOR
OFF ON
PORT OK
RECEIVING
PORT OK
RECEIVING
PORT OK
RECEIVING
POWER
10BASE-T NETWORK PORTS
STATUSAUIBNC
IEEE 802.3/ ETHERNET
10BASE-T
MULTIPORT REPEATER
1234 5678 9101112 13141516
1
2
3
6
1
2
3
6
1
2
3
6
1
2
3
6
MDI MDI-X
ACTIVITY
COLLISION
POWER
Figure 3: AT-3024TR
Front Panel
TERMINATOR
OFF ON
PORT OK
RECEIVING
PORT OK
RECEIVING
PORT OK
RECEIVING
POWER
10BASE-T NETWORK PORTS
IEEE 802.3/ ETHERNET
10BASE-T
MULTIPORT REPEATER
1357911 131517192123
24681012 141618202224
1
2
3
6
1
2
3
6
1
2
3
6
1
2
3
6
MDI MDI-X
ACTIVITY
COLLISION
POWER
XXXX
XXXXX
XXXX
X XXXXX
X X
X X
STATUSAUIBNC
1357911131517192123
24681012141618202224