Troubleshooting guide
MX2820 System Manual
7-36 61186003L1-1D
Figure 7-6. MX2820 Backplane Wire-Wrap Posts
PREREQUISITE PROCEDURES
Obtain all necessary local instructions before connecting the wire-wrap posts. This procedure
should be performed before installing the DS3/STS-1 network and DSX-1 (T1/E1) network
cabling. Before making external alarm connections, the MX2820 shelf should be mounted in
its permanent location.
The CHAIN wire-wrap posts are intended for use in an RS-485 bus configuration. For details
on interconnecting the shelves in an RS-485 bus configuration, refer to “DLP-712, Make RS-
485 Bus Connections Between Shelves”.
TOOLS REQUIRED
• wire cutters
• wire strippers
•wire-wrap tool
MATERIALS REQUIRED
• 22 or 24 two-conductor twisted pair cross-connect wire
USE COPPER
CONDUCTORS ONLY
R8
R7
R6
R5
P4
P6
N
C
C
N
O
C
N
O
M
I
N
N
C
C
N
O
+
–
N
H
C
T
R
S
T
R
S
A
U
X
1
A
U
X
2
A
U
X
3
A
C
O
P
W
R
A
R
E
T
A
P
W
R
B
R
E
T
B
J2
J1
TB1
CLKB
R4
R10
R1
D1
R2R9
R3
D4
D3
D2
1 IN
(T1/R1)
AUX 1
AUX 2
AUX 3
ACO
NO
COM
NC
C
R
I
T
NO
COM
NC
M
A
J
SHLD
RNG
TIP
SHLD
RNG
TIP
C
L
K
A
C
L
K
B
--
+
NO
COM
NC
M
I
N
C
H
A
I
N
MX2820 Backplane