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2.3 Connectors and Indicators
The Mux's LEDs and connectors are described below. Refer to Figures 2-1 and 2-2 to locate each connector or
indicator.
Polling Group #1 Status
0
LINK
STATUS
2X
•
TX
POWER
RX
Power
Activity LEDs
(TX and RX)
Product
identification
label
Power LED
TX Activity LED
RX Activity LED
Polling Group Status LEDs
Polling Group Connectors
LEDs and Connectors
1
2
3
2X
2X
2X
2X
•
•
•
•
GROUP A
GROUP B
Figure 2-1. The Express 8-Port Mux's Front Panel.
External power supply
Figure 2-2. The Express 8-Port Mux's Rear Panel.
On when the Express 8-Port Mux is powered up.
On when a signal is transmitted to the fiber optic aggregate link.
On when a signal is received from the fiber optic aggregate link and the
Mux synchronizes to it.
The upper green LEDs are express mode indicators. These LEDs activate
when an express signal is detected, and they remain on until a 1-Mbps signal
is detected or a system reset occurs. The lower green LEDs are data activity
indicators. These LEDs activate when a signal is present.
There are two polling groups. Each polling group has been divided into two
port groups. Polling group #1 consists of ports 0 through 3 (port groups A
and B), and polling group #2 consists of ports 4 through 7 (port groups C
and D). Ports within a polling group must be connected to ports from a common
controller.
Polling Group #2 Status
LEDs and Connectors
4
5
6
7
2X
2X
2X
•
•
•
GROUP C
GROUP D
FCC label
DC power
connection
EXPRESS 8-PORT MUX
Express 8 Port Mux
Fiber optic
link
DB25
Configuration
switches
7
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