Connecting the Cables

Connecting the BITS Cable

Connecting DS3 Cables

Connecting T1 Cables

Connecting Fast Ethernet Cables

Connecting Management Cables

Connecting Visual and Audible Alarms

Applying DC Power

Verifying LED Indications

Connecting the Cables

This chapter describes how to connect the cables, power the system, and finally, check the LEDs to make sure you installed everything properly. You connect the following cables:

BITS---STP cables for the timing source

DS3---coaxial cables terminated with SMB connectors for the broadband interface (see Table 3-1)
T1---Champ 50-pin mass termination transmit and receive cables
Fast Ethernet---STP cables terminated with RJ-45 connectors for the trunk interfaces
10BaseT---STP cable terminated with RJ-45 connectors for the management interface
Alarm---Custom cable terminated in a DB15 connector for visual or audible alarm indications
DC Power---14 AWG ST, UL 1015 wires for power, return, and safety ground

Caution Use shielded cables with shielded connector hoods for all connections except DC power.

Cisco provides the following custom adapter and extension cables:

Table 3-1: DS3 Adapter and Extension Cables

Cisco Part Number Description

CAB-5698-6

T3/E3 SMB Female to SMB Female, 6 Ft.

CAB-T3E3-PL-AD

T3/E3 SMB Female to BNC Female, 6 Ft.

BNCM-BNCM-25

T3/E3 BNC Male to BNC Male, 25 Ft.

CAB-T3E3-PL-Y

T3/E3 SMB Female to `Y' BNC Female, 1 Ft. Redundancy Cable

Cisco Part Number	Description
CAB-5698-6	T3/E3 SMB Female to SMB Female, 6 Ft.
CAB-T3E3-PL-AD	T3/E3 SMB Female to BNC Female, 6 Ft.
BNCM-BNCM-25	T3/E3 BNC Male to BNC Male, 25 Ft.
CAB-T3E3-PL-Y	T3/E3 SMB Female to `Y' BNC Female, 1 Ft. Redundancy Cable

Connecting the BITS Cable

To connect the BITS cable, follow these steps:

Step 1 From the rear of the unit, connect the BITS cable to the SCC in slot 9 (see Figure 3-1).

The BITS connection is a DS1 line to the Stratum timing standard in your facility.

Figure 3-1: Connecting the BITS Cable

Step 2 Connect the other end of the cable to the Stratum timing standard in your facility.

Step 3 If your system has a redundant SCC, repeat steps 1 and 2 for the adjacent SCC.

Connecting DS3 Cables

To connect nonredundant DS3 cables, follow these steps:

Step 1 Connect the TX coaxial cable to the line 1 TX connector on the BSC or DMC back card (see Figure 3-2).

Figure 3-2: Connecting DS3 Cables

Step 2 Connect the RX coaxial cable to the line 1 RX connector on the same card.

Step 3 Repeat steps 1 and 2 for each DS3 line.

To connect DS3 cables to redundant BSCs, follow these steps:

Step 1 Using a DS3 Y-Adapter, connect one of the SMB plugs to the line 1 TX connector on the DS3 back card (see Figure 3-2).

Step 2 Connect the other SMB plug to the line 1 TX connector on the redundant DS3 back card.

Step 3 Connect the adapter's BNC connector to a TX DS3 circuit in your facility.

Note Choose adjacent BSCs for 1:1 redundancy, as shown in the illustration.

Step 4 Using another DS3 Y-Adapter, connect an SMB plug to the line 1 RX connector on the DS3 back card.

Step 5 Connect the other SMB plug to the line 1 RX connector on the redundant DS3 back card.

Step 6 Connect the adapter's BNC connector to the corresponding RX DS3 circuit.

Step 7 Repeat steps 1 - 6 for other redundant DS3 lines.

Connecting T1 Cables

To connect the T1 cables, follow these steps:

Step 1 Connect the transmit T1 cable to the 50-pin connector at the top of the NSC rear card (see Figure 3-3).

Figure 3-3: Connecting T1 Cables

Step 2 Connect the receive T1 cable to the 50-pin connector at the bottom of the NSC rear card.

Step 3 Repeat steps 1 and 2 for other NSC rear cards.

Connecting Fast Ethernet Cables

To connect the Fast Ethernet cables, follow these steps:

Step 1 Snap the first STP cable to the top receptacle of the SCC rear card in slot 9 (see Figure 3-4).

Figure 3-4: Connecting Fast Ethernet Cables

Step 2 Snap the other end of the cable into the appropriate communication equipment.

Step 3 Repeat steps 1 and 2 for other Fast Ethernet cables.

Step 4 If your system has a redundant SCC, repeat steps 1 through 3 for the adjacent SCC.

Connecting Management Cables

To connect system management cables:

Step 1 Connect a DB9 cable at the SCC console connector.

Step 2 Route the other end of the cable to the front or the chassis for later use.

Step 3 Optionally, connect a DB9 cable between the AUX connector and a modem. A modem supports remote management via a dialup connection.

Step 4 Snap an Ethernet cable into the Management port on the SCC back card (see Figure 3-5).

Figure 3-5: Connecting the Management Ethernet Cable

Step 5 Snap the other end of the Ethernet cable to a nearby hub or host.

Step 6 If your system has a redundant SCC, repeat steps 3 and 4 for the adjacent SCC.

Connecting Visual and Audible Alarms

To connect alarm relay contacts, follow these steps:

Step 1 Prepare a custom alarm cable for visual or audio alarms in your facility. Terminate this cable in a DB15 cable using the pinouts in Appendix A.

Step 2 Connect the DB15 cable to the Alarm connector on the SCC back card.

Applying DC Power

This procedure explains how to connect and apply DC power to the MGX 8260. Make sure to observe the recommended wire gauge and number of power cables.

To connect DC power, follow these steps.

Step 1 Disable DC power from its source. If you are using a separate DC power supply, open the breakers. If you are using a DC power panel, pull the fuses for the new power circuits. Make sure you disable the power source for both power circuits, A and B.

Step 2 If necessary, remove the power circuit cover from power terminals A and set it aside. To remove the cover, loosen the two captive screws and lift the cover off.

Step 3 At the rear of the Cisco MGX 8260 chassis, connect -48 VDC to the -48 VDC terminal (see Figure 3-6). Use 14 AWG ST, UL 1015 wire with #8 SNAP SPADES for 16-14 AWG (MOLEX BB-8716-08).

Step 4 Connect a second identical cable to the adjacent -48 VDC power terminal.

Figure 3-6: Connecting DC Power

Step 5 Connect a power return cable to the RTN terminal. Use 14 AWG ST, UL 1015 wire with #8 SNAP SPADES for 16-14 AWG (MOLEX BB-8716-08).

Step 6 Connect a second identical cable to the adjacent RTN power terminal.

Step 7 Install the power circuit cover. Slide the tab at the top of the cover into the chassis, and then lower the body over the terminals, making sure the power cables exit through the slots in the bottom (see Figure 3-7).

Caution Make sure the power circuit cover is correctly seated and that the power cables pass freely through the openings at the bottom. Exposed power terminals or damaged insulation pose a safety risk to operations personnel.

Figure 3-7: Installing the Power Terminal Cover

Step 8 Secure the cover with the two captive screws.

Step 9 To install power circuit protection, repeat steps 2 - 8 for power circuit B; then connect the power circuit B cables to a standby DC supply or the s secondary power bus

Step 10 Apply DC power, either by switching the DC supply on or replacing fuses.

Verifying LED Indications

To verify correct cabling, follow these steps:

Step 1 Verify that the PWR A indicators on the SCC is on (see Figure 3-8).

Figure 3-8: Power LEDs

Step 2 If you are using power redundancy, verify that the PWR B LED is on.

Step 3 After a startup period, the CARD LED on each card should change to yellow or green. If the CARD LED of any card is red or off, troubleshoot the problem before proceeding.

Table of Contents

Connecting the Cables