16
PRO SWITCHING SYSTEM
Figure 2-5. Mixing Connectors in a Rack.2.2.5 L
INE
C
ARD
S
WITCHESAND
I
NDICATORS
Each Switching card has a switch on the front panel for manual control. Each card
also has LED indicators.
(Refer to Chapter 4, Components, for a full description of line card switches
and LEDs.)
2.2.6 C
ONTROL
C
ARD
S
WITCHESAND
I
NDICATORS
The rack control card has a five-button switch panel for gang switching (see Figure
2-6). You can enable/disable this function by a key switch. When you press a
button, all cards in the rack that have the indicated capability switch.
For example, if you press the B button, all A/B switching cards in the rack will
switch to B.
Switching is performed by latching relays, which, if the power fails, remain in
the last switched position and continue to pass data.
The control card also has a Lamp Test button to test the rack LEDs. A reset
button reboots the system (warm or cold reboot, depending on a DIP-switch
setting).
Control Card LEDs indicate Power Supply, Fan, and System Status.
A
B
C
O
M
A
B
C
O
M
A
B
C
O
M
A
B
C
O
M
A
B
C
O
M
A
B
C
O
M
A
B
C
O
M
A
B
C
O
M
A
B
C
O
M
A
B
C
O
M
A
B
COM
A
B
COM
A
B
COM
A1
A2
A3
A4
B1
B2
B3
B4
C1
C2
C3
C4
C
O
M
B
A
C
O
N
T
R
O
L
1
C
O
M
M
I
N
C
O
N
T
R
O
L
2
C
O
M
M
O
U
T
D
I
G
I
T
A
L
A
N
A
L
O
G
MON
BUS
A
U
X
P
O
R
T
P
O
W
E
R
1
P
O
W
E
R
2
100-240V 50-60HZ
FUSE RATING: T3.0A
250V~ONLY