Cisco MGX 8260 Guida rapida

CHAPTER

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Connecting the Cables

This chapter describes how to connect the interface cables, power the system, and check the status LEDs

on circuit cards to make sure you have installed everything properly.

Cisco MGX 8260 configurations will require some type of cable management plan for the WAN cabling.

This may include the installation of vertical and horizontal cable raceways that bolt to the racks.

The MGX 8260 uses the following cable types:

•BITS—STP (Shielded Twisted Pair) cables for the timing source, terminated with RJ-45 connectors

•DS3—Coaxial cables for DS3 lines terminated with SMB connectors (see Table 5-1)

•T1—STP cables for 100-ohm T1 lines terminated with 50-pin RJ-21 connectors

•E1—STP cables for 120-ohm E1 lines terminated with RJ-48 connectors

•Fast Ethernet—Category 5 STP cables for 100BASE-TX lines terminated with RJ-45 connectors

•OC-3—Single or mulitmode fiber cables for OC-3 lines terminated in small form factor LC or

MT-RJ connectors

•10BASE-T—Category 5 STP cables for Ethernet management ports terminated with RJ-45

connectors

•Alarm—Custom cable for visual or audible alarm indications terminated on a DB-15 connector

•Console—EIA/TIA-232 serial cable for a console terminated with a DB-9 connector

•Aux—EIA/TIA-232 serial cable for a modem terminated with a DB-9 connector

•DC Power—12 AWG ST, UL 1015 wires for power and return. 8 AWG for safety ground

For more information on cables, see Appendix A, “Cable and Connector Reference”.

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

Table 5-1 lists custom adapter and extension cables offered by Cisco for the MGX 8260.

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Chapter 5 Connecting the Cables

Connecting the BITS Cable

A wiring diagram for a BITS cable is provided in Appendix A, “Cable and Connector Reference.” To

connect the BITS cable, follow these steps:

Step 1 If your system uses a Building Integrated Timing Source (BITS) timing source (Stratum 3 clock),

connect a BITS cable to the RJ-45 connector on the SCC back card in slot 9. (See Figure 5-1.)

Figure 5-1 Connecting the BITS Cable

Table 5-1 DS3 Adapter and Extension Cables

Cisco Part Number Description

CAB-5698-6 T3/E3 SMB Female to SMB Female, 6 feet (75 ohm)

CAB-T3E3-PL-AD T3/E3 SMB Female to BNC Female, 6 feet (75 ohm)

BNCM-BNCM-25 T3/E3 BNC Male to BNC Male, 25 feet (75 ohm)1

1. Used for BSC and DMC redundancy.

CAB-T3E3-PL-Y T3/E3 SMB Female to ‘Y’ BNC Female, 1 Ft. Redundancy Cable1

31646

BITS CONSOLE AUX ALARM

MGMT

1 2 3 4

BITS CONSOLE AUX ALARM

MGMT

1 2 3 4

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Chapter 5 Connecting the Cables Connecting DS3 Coaxial Cables

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 Step 1 and Step 2 for the adjacent SCC.

Note Do not daisychain the BITS connection to the secondary SCC. Daisychaining BITS causes

unnecessary wander buildup in the clock network. Instead of daisy-chaining, use a Timing Signal

Generator (TSG) at the facility to create multiple copies of the Stratum 3 BITS clock, then run the

copies to each SCC separately.

Connecting DS3 Coaxial Cables

Each DS3 trunk requires two coaxial cable connections—one for transmit and one for receive.

Appendix A, “Cable and Connector Reference,” specifies cable requirements for DS3 lines. To connect

DS3 coaxial cables to nonredundant BSCs or DMCs, follow these steps.

Note Mark each cable with identifying information suitable for tracking in the MGX 8260 configuration

database.

Step 1 Connect a transmit DS3 line (coaxial cable terminated with a female SMB connector) to the TX

connector on the T3E3BC-6DSX back card. (See Figure 5-2.)

Step 2 Connect the receive DS3 line associated with the TX line in Step 1 to the RX connector associated with

the TX connector in Step 1. (See Figure 5-2.)

Step 3 Repeat Step 1 and Step 2 for all DS3 lines.

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Chapter 5 Connecting the Cables

Connecting DS3 Coaxial Cables

Figure 5-2 Connecting Nonredundant DS3 Cables

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

Note Label each cable with identifying information suitable for tracking in the MGX 8260 configuration

database.

Step 1 Using a DS3 Y-Adapter cable, connect one of the cable’s SMB plugs to a TX connector on the DS3 back

card. (See Figure 5-3.)

Step 2 Connect the other SMB plug to the corresponding numbered TX connector on an adjacent DS3 back

card.

Step 3 Connect the adapter cable’s BNC connector to a TX DS3 line in your facility.

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

associated with the TX connector in Step 1.

Step 5 Connect the other SMB plug to the corresponding numbered RX connector on the adjacent DS3 back

card associated with the TX connector in Step 2.

Step 6 Connect the adapter cable’s BNC connector to the RX DS3 line in your facility associated with the TX

DS3 line in Step 3.

Step 7 Repeat Step 1 through Step 6 for all DS3 trunks on redundant BSCs.

BITS CONSOLE AUX ALARM

MGMT

1 2 3 4

BITS CONSOLE AUX ALARM

MGMT

1 2 3 4

Non-redundant BSC

TX cable

RX cable

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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 AUX ALARM

MGMT

1 2 3 4

BITS CONSOLE AUX ALARM

MGMT

1 2 3 4

TX cable

Redundant

BSC pair

RX cable

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Chapter 5 Connecting the Cables

Connecting T1 Cables via RJ-21 Connectors

Step 5 Tighten the screws at the top and bottom of the receive 50-pin connector.

Step 6 Repeat Step 1 through Step 5 for other NSC back cards.

Figure 5-4 Connecting T1 Cables

PWR B

-48VDC B RTN B

PWR A

-48VDC A RTN A

BITS CONSOLE AUX ALARM

MGMT

1234

BITS CONSOLE AUX ALARM

MGMT

1234

33474

Transmit (TX)

Receive (RX)

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Chapter 5 Connecting the Cables Connecting E1 Cables via RJ-48 Connectors

Connecting E1 Cables via RJ-48 Connectors

Each E1 trunk consists of two pairs of tip and ring wires—one pair for transmit and one pair for receive.

A 4-wire cable terminated with RJ-48 connectors connects the trunks to the NSC back card. A cable

wiring diagram is provided in Appendix A, “Cable and Connector Reference.”

To connect E1 cables to the 120-ohm RJ-48 connectors on the NSC back card, follow these steps.

Note Label each cable with identifying information suitable for tracking in the MGX 8260 configuration

database.

Step 1 Snap the first STP cable into a receptacle on an RJ-48 back card. (See Figure 5-5.)

Step 2 Connect the other end of the RJ-48 cable to a patch panel or other compatible communication equipment.

Step 3 Repeat Step 1 and Step 2 for other E1 lines.

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Chapter 5 Connecting the Cables

Connecting E1 Cables via RJ-48 Connectors

Figure 5-5 Connecting E1 Cables

PWR B PWR A

-48VDC A RTN A

BITS CONSOLE AUX ALARM

MGMT 12

45925

1234

BITS CONSOLE AUX ALARM

MGMT 12

1234

STP cable

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Chapter 5 Connecting the Cables Connecting Fast Ethernet Cables

Connecting Fast Ethernet Cables

This procedure applies to systems that use Fast Ethernet interfaces on the SCC back card for VoIP

applications. Refer to Appendix A, “Cable and Connector Reference,” for a cable wiring diagram. If

your system uses OC-3 interfaces, skip this procedure.

To connect 100BASE-TX Fast Ethernet cables, follow these steps:

Step 1 Connect the first network cable to an RJ-45 receptacle on the SCC back card in slot 9 (see Figure 5-6).

Figure 5-6 Connecting Fast Ethernet Cables

Step 2 Connect the other end of the cable to the appropriate network device.

Note Fast Ethernet redundancy is achieved through the use of appropriately configured network devices.

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

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

BITS CONSOLE AUX ALARM

MGMT

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BITS CONSOLE AUX ALARM

MGMT

1 2 3 4

33473

Fast Ethernet

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Cisco MGX 8260 Hardware Installation Guide 78-10966-02

Chapter 5 Connecting the Cables

Connecting OC-3 Cables

Note This procedure applies to MGX 8260 nodes configured with SCC OC-3 back cards for fiber interface

to Cisco MGX 8850 ATM switches. If your MGX 8260 node uses SCCs with Fast Ethernet back

cards, skip this section.

Each fiber interface consists of two fiber-optic cables—one for transmit signals and one for receive

signals. If the SCC is equipped with the single mode OC-3 back card, the fiber cables must be terminated

with LC type connectors at the MGX 8260. If the SCC is equipped with the multimode OC-3 back card,

the fiber cables must be terminated with MT-RJ type connectors at the MGX 8260.

Note The transmit and receive fiber cables must be reversed at each device. The receive fiber cable from

the MGX 8260 goes to the transmit port at the other end, and vice versa.

Caution When handling optical cables, observe the manufacturer’s bend radius limits.

To connect the OC-3 fiber-optic cables, follow these steps:

Step 1 Connect the first optical cable to the top receptacle of the SCC back card in slot 9 or 10 (See Figure 5-7.)

Step 2 Route the optical cable down and to the side of the chassis, observing the minimum bend radius for the

cable.

Step 3 Connect the other end of the cable into the appropriate communication equipment.

Step 4 Repeat Step 1 through Step 3 for other optical cables.

Step 5 If your system has a redundant SCC, repeat Step 1 through Step 4 for the adjacent SCC.

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