Enterasys Networks CSX7000 User Manual download pdf (Page 95)

100

101

Central Site Remote Access Switch 95

ARDWARE

NSTALLATION

Connecting Adapter Inter-Board Cables

If you have PRI-23/30 cards: Use an MVIP bus connection between cards whenever possible to

achieve the best results. This applies to both:

• multiple PRI-23/30 configurations

• PRI-23/30 cards in combination with DM cards

If you have only PRI-23 cards: Use a TDM bus between WAN cards and an MVIP bus to connect to

the DM. (I.e., connect all TDM connectors to other TDM connectors, and all MVIP connectors to

other MVIP connectors within the system.)

If you have a mixture of PRI-23 cards and PRI-23/30 cards: Use both a TDM bus and an MVIP bus.

Connect all TDM connectors to other TDM connectors, and all MVIP connectors to other MVIP

connectors within the system.

If you have BRI, PRI-8 or Expander cards: You must use a TDM bus. If you also have a DM card in

your configuration but no PRI-23 or PRI-23/30, you will need to use a crossover cable to connect the

TDM bus to the MVIP connector of the DM card.

To establish the inter-board bus, you’ll need a flat bus cable and possibly a crossover cable.

The flat bus cable is a 40-pin ribbon cable. The cable can have from 2 to 6 connectors, depending on

the adapter configuration of the CyberSWITCH. The ribbon cable connectors are spaced

approximately 1 inch apart to mate with the adapter connectors. Never cut a flat cable to shorten it.

Flat Bus (Ribbon) Cable

Some flat cables consist of a primarily grey ribbon, with a single red wire to indicate pin 1. These

are essentially the same as the flat bus cable pictured.

Interconnect all the adapters with the same connectors using one flat bus cable of an appropriate

length. If your installation combines cards that have TDM-only connectors with cards that have

MVIP-only connectors, you will need to use a crossover cable.

The crossover cable is a 12-wire ribbon cable with 40-pin connectors. You only need the crossover

cable if all the following conditions are true:

• a Digital Modem adapter is present,

• BRI-4, or PRI-8 is present, and

• no PRI-23 or PRI-23/30 is present

Notice that the crossover cable connects between two flat cables. When connecting the crossover

cable to the flat cable, align pin 1 on both connectors. Pin 1 is identified by an embossed triangle on

the underside of each connector.

40-wire

ribbon cable

pin 1

4 adapter bus

connectors

2 adapter bus

connectors

40-wire

ribbon cable

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 728 729

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Enterasys Networks CSX7000 User Manual Page 95

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