800-357-104-01, Revision 01
Wiring the Common Access Panel
HMS-357 List 4 and List 5
September 29, 2000
19
W
IRING
THE
C
OMMON
A
CCESS
P
ANEL
Figure 13.
Common Access Cover Plate
Step
Procedure
Installer Check
ü
ü
ü
ü
Whenever installing or removing units from the HMS-357 chassis, be sure to wear an
antistatic wrist strap and connect it to the ESD strap input.
1
Loosen both screws on the Common Access cover plate with a No. 1 Phillips screwdriver and gently
slide the cover up to remove it.
H
2
Connect alarm relay wires from the CO alarm center to the wire wrap posts at the Management Alarm
(TB2). Follow the CO site instructions for connecting alarm relays.
H
3
Connect transmit (TX) tip and ring and receive (RX) tip and ring at the DSX-1 Test Access (TB3) block
and the corresponding chassis shield posts to the external test head.
H
4
If you are installing an HXU-359 multiplexer in your Wideband System 3190, connect the Bits Timing
(TB4) block Bits A, Bits B, and the corresponding chassis shield posts to your SONET clock
synchronization source.
H
5
If you have a requirement for an external alarm, such as an open door, use the User Configurable
Alarm Inputs (TB5) block to wire the SSC1 EXT ACO (Special Signaling Channel 1 External Alarm
Cutoff), the SSC2 (Special Signaling Channel 2), and the chassis shield to your third-party alarm.
H
6
Wire pins 1 and 2 of the Fan (TB6) block in series with an external fan system.
There is a dry contact closure between pins 1 and 2 when the internal air temperature of the HMS-357
reaches 80° F.
H
7
If you are not installing a multiplexer in your HMS-357 and you need a second auxiliary port
connection, move the shunt from the P1 (MUX DEFAULT) position to the P2 (AUX ACTIVE) position.
H
8
Replace cover and tighten the screws.
H
9
Proceed to
“Installing the Power Cables” on page 20
H
Installer Signature
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?
?
?
Date
A-
TB5
SHIELD
SHIELD
B+
B-
SHIELD
DSX-1
FAN
TB6
1
2
1
1
1
2
2
P2
P1
7
7
8
8
AUX 2
ACTIVE
MUX
(DEFAULT)
2
R
RING
T
TIP
BITS TIMING
TEST ACCESS
TB4
TB3
SSC
I
EXT
AC
O
SS
C2
TB2
SYS ID
MIN VIS
MIN AUD
MAJ VIS
MAJ AUD
CRT VIS
NO
COM
NC
CRT AUD
COM
NO
A+
RX
TX