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Table Of Contents
Cabling Summary
Introduction
This appendix contains details on the MGX 8950 cabling.
Note
In all cable references, the transmit direction is away from the system, and the receive direction is toward the system.
T3 Trunk Cabling
The T3 trunk cable specifications for the SMB-8T3 back card are listed in Table B-1 and Table B-2.
Table B-2 T3 Connector Pin Assignments
Rx SMB
Receive T3 from trunk
Tx SMB
Transmit T3 to trunk
E3 Trunk Cabling
A trunk cable connects each E3 port on the SMB-8E3 back card to a E3 port. See Table B-3 and Table B-4 for details.
Table B-4 E3 Connector Pin Assignments
Rx SMB
Receive E3 from trunk
Tx SMB
Transmit E3 to trunk
DC Power Cabling
DC power connections are made to the DC Power Entry Modules at the rear of the MGX 8950 node. (See Figure B-1.) See Table B-5 for acceptable cable and wire types. Cisco normally does not provide wiring for DC-powered systems.
Figure B-1 DC Power Connections
AC Power Cabling
Table B-6 shows the power cords that Cisco can supply.
Control and Clock Cabling
This section describes the cables that can connect to the PXM-UI-S3 card.
Maintenance and Control Ports
The maintenance (or modem) port and the control (or console) port connect a node to an ASCII terminal, workstation, or modem for remote alarm reporting or system monitoring. See Table B-7 for a description of the cabling and Table B-8 for the pinout of the associated RJ48 connector.
Modem Cable
Figure B-2 shows a modem cable that is used for connecting modems to the MGX 8950 control and maintenance ports.
Figure B-2 Null Modem Cable
External Clock Input Cabling
The external clock input cable connects the external clock inputs through the PXM-UI-S3. The clock may be 1.544 Mbps for 2.048 Mbps. (See Table B-9 through Table B-15.)
T1/E1 Clock Cabling
The T1 RJ48 clock port can accept a T1 BITS clock input. The E1 RJ48 clock port can accept a 2.048 MHz clock sync or a 2.048 Mbps E1 bi-polar signal.
Bits Clock Connector Pin Outs
Table B-10 lists the pinouts for the RJ48 BITS clock connector using T1 BITS. Make sure that the 100 ohm termination is selected when configuring the clocks. You will need to connect only the RX Ring, RX tip, and the ground signals.
Table B-10 RJ48 BITS Clock Connector Pin Outs
1
TX Ring
2
TX Tip
3
Ground
4
RX Ring
5
RX Tip
6
Ground
7
TTP Ring
8
TTP Tip
External Alarm Cabling
The external alarm cable connects to the alarm connector on the PXM-UI-S3 card. See Table B-11 for the physical characteristics of the cable and Table B-12 for the pinouts.
Table B-11 External Alarm Cabling
Interface
Dry-contact relay closure.
Wire
24 AWG, shielded, 6-pair.
Connector
DB-15, Subminiature, male.
Alarm Connector Pin Outs
Table B-13 shows the pin assignment on the alarm connector on PXM-UI-S3. When the audio alarm is enabled, the Audio Alarm On and the Audio Alarm Common pins are closed (short circuit). When the audio alarm is disabled, the Audio Alarm On and the Audio Alarm Common pins are opened (open circuit).
When the visual alarm is enabled, the Visual Alarm On and the Visual Alarm Common pins are closed and the Visual Alarm Off pin is opened. When the visual alarm is disabled, the Audio Alarm Off and the Audio Alarm Common pins are closed and the Visual Alarm On pin is opened.
Table B-13 PXM-UI-S3 Pin Assignment on the Alarm Connector
Critical Audio Alarm On
1
S1
O2
—
—
Critical Audio Alarm Common
9
Common
Common
—
—
Critical Visual Alarm On
2
—
—
S
O
Critical Visual Alarm Common
10
—
—
Common
Common
Critical Visual Alarm Off
3
—
—
O
S
Major Audio Alarm On
11
S
O
—
—
Major Audio Alarm Common
4
Common
Common
—
—
Major Visual Alarm On
12
—
—
S
O
Major Visual Alarm Common
5
—
—
Common
Common
Major Visual Alarm Off
13
—
—
O
S
Minor Audio Alarm On
6
S
O
—
—
Minor Audio Alarm Common
14
Common
Common
—
—
Minor Visual Alarm On
7
—
—
S
O
Minor Visual Alarm Common
15
—
—
Common
Common
Minor Visual Alarm Off
8
—
—
O
S
1 S = Signal is shorted with Common
2 O = Signal is opened
Standard MGX 8950 Cables
The standard cables that Cisco can supply for the MGX 8950 system appear in Table B-14. The suffix to the model number indicates the length of the cable. For example, 5610-50 indicates a 50-foot cable. Cables are available in standard lengths of 10 ft. (3 m), 25 ft. (7.6 m), 50 ft. (15 m), 75 ft. (22.8 m), and 100 ft. (30 m). Lengths of 100 ft. (30 m) to 600 ft. (183 m) are available through a special order.
Where applicable, Table B-14 includes the gender of the connector and the number of pins. For example, EIA/TIA-232/M25-M25 indicates a cable terminated with a male DB25 at both ends.
Redundancy Y-Cable
Special Y-cables provide line redundancy where applicable. Table B-15 lists the Y-cables that are used with various MGX 8950 cards.
