Black-box 5000 User Manual download pdf (Page 65)

CHAPTER 7: Bench Configuration and Testing

7.3 Using Modems with the Interconnect Link

Figure 7-3 illustrates how modems can be used to

connect two Multiservers. The modems you use with

your Multiservers must be V.32 or better, capable of

synchronous, full-duplex, leased-line operation.

Dialup modems (instead of leased-line modems)

should only be used with an analog backup link.

For both the Local and Remote Multiservers, attach

the modem to the Multiserver with male-to-male

crossover cable (EZ423). Configure the port for an

interconnect link with external clocking.

Configure each modem for synchronous, full-

duplex operation. Set the modem attached to the

Remote Multiserver for Answer (or recover

clocking). Set the modem attached to the Local

Multiserver for Initiate (or internal clocking).

NOTE: If the modem has data compression, make

sure the compression is turned off

. The

compression could compromise the data

stream from the Multiserver.

Connect the two modems with crossover cable. The

type of crossover cable that you need will depend

upon the modems that you use.

Connect the cables and plug in the Multiservers.

Once the modems have established a connection,

the CCM indicator LEDs for the link will be off.

This indicates that the link is functioning properly.

In the example in Figure 7-3, the CCM indicator

LED for port A1 would go off on each of the

Multiservers. A flashing LED indicates a problem

with your equipment or configuration.

For more information on interconnect links, refer

to Section 8.4, Port Configuration, and Section 8.5,

The Interconnect Link.

12 456

3 12 456

Modem

EZ423 EZ423

Crossover Cable

Figure 7-3. Modems can be used to connect two Multiservers via an interconnect link.

Local Multiserver Remote Multiserver

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Black-box 5000 User Manual Page 65