5-5
Cisco MGX 8260 Hardware Installation Guide
78-10966-02
Chapter 5 Connecting the Cables
Connecting T1 Cables via RJ-21 Connectors
Figure 5-3
Connecting Redundant DS3 Cables
Connecting T1 Cables via RJ-21 Connectors
DS1 trunks consist of two pairs of tip and ring wires—one pair for transmit signals and one pair for
receive signals. Prefabricated 25-pair STP cables terminated with 50-pin connectors on each end are
used to link a DSX patch panel to the matching connectors on the NSC back card. A cable wiring
diagram is provied in
Appendix A, “Cable and Connector Reference.”
To connect the T1 cables to an NSC back card equipped with 50-pin RJ-21 connectors, follow these
steps.
Note
Label each cable with identifying information suitable for tracking in the MGX 8260 configuration
database.
Step 1
Connect the transmit T1 cable to the 50-pin connector at the top of the NSC rear card. (See
Figure 5-4
.)
Step 2
Tighten the screws at the top and bottom of the 50-pin connector.
Step 3
Secure both cables near the rack to keep weight off the connector.
Step 4
Connect the receive T1 cable to the 50-pin connector at the bottom of the NSC back card.
BITS
CONSOLE
A
U
X
ALARM
MGMT
1
2
3
4
12
RX
TX
6
RX
TX
1
RX
TX
2
RX
TX
3
RX
TX
4
RX
TX
5
RX
TX
6
RX
TX
1
RX
TX
2
RX
TX
3
RX
TX
4
RX
TX
5
RX
TX
6
RX
TX
1
RX
TX
2
RX
TX
3
RX
TX
4
RX
TX
5
RX
TX
6
RX
TX
1
RX
TX
2
RX
TX
3
RX
TX
4
RX
TX
5
RX
TX
6
RX
TX
1
RX
TX
2
RX
TX
3
RX
TX
4
RX
TX
5
RX
TX
6
RX
TX
1
RX
TX
2
RX
TX
3
RX
TX
4
RX
TX
5
RX
TX
6
RX
TX
1
RX
TX
2
RX
TX
3
RX
TX
4
RX
TX
5
BITS
CONSOLE
A
U
X
ALARM
MGMT
1
2
3
4
12
RX
TX
6
RX
TX
1
RX
TX
2
RX
TX
3
RX
TX
4
RX
TX
5
TX cable
Redundant
BSC pair
RX cable
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