2. Cabling
2-4
October 2002 4200-A2-GN20-10
4202 E1 Uplink Module Connectors
The 4202 E1 Uplink Module has two connectors, only one of which may be used at
a time:
120
Ω
connector – A balanced RJ48C, 8-pin, unkeyed, unshielded connector.
The 120
Ω
connector is the default.
75
Ω
connector – An unbalanced BNC connector with two jacks (TX/RX). To
use the 75
Ω
connector, you must change the default using the TL1
commands. For more information on TL1 commands, see the
GranDSLAM 4200 ATM Stackable DSLAM User’s Guide
.
NOTE:
The metal shell of the T1 connector is grounded. Pins 7 and 8 of the connector
are not grounded. Therefore, if the cable you are using is wired to connect its
shield to pins 7 and 8, then the cable’s shield will not be grounded at the
module end. To ground the cable shield at the module end, you must use a
cable with a shielded plug and the cable shields (drain wires) must be
connected to the plug’s shield. If your cable has separate shields for transmit
and receive, you must ground both drain wires. You can also ground the
shields at the far end, or you can use a nonshielded cable.
Procedure
To connect to the 4202 E1 Uplink Module 120
Ω
connector:
1. Determine the interface type, and procure the appropriate cable.
2. Plug the 8-position modular plug into the 120
Ω
modular jack.
CAUTION:
Do not plug cables into both the 120
Ω
and the
75
Ω
connectors
at the
same time.
02-17276
8-Position
Modular
Plug
11
2
1
3
2
4
48
1
6
2
0
P
O
W
E
R
A
A
L
A
R
M
R
T
N
-4
8
V
D
C
B
IT
S
M
G
M
T
C
O
N
S
O
L
E
S
T
A
T
U
S
U
P
L
IN
K
A
L
R
M
T
E
S
T
B
A
3.5 A
60
B
E
1
M
O
D
U
L
E
4202
T
X
R
X
1
2
0
Ω
7
5
Ω
