Motorola LM2000 Guía de instalación descargar pdf (Pagina 76)

76 DC 900-1331F

Freeway 2000/4000 Hardware Installation Guide

4.3.2 Cabling for Loopback Tests

Figure 4–16 shows how to conﬁgure cables for Freeway loopback testing. The ﬁgure

shows 8-port WAN connector panels, but the connections for 16-port WAN connector

panels are similar.

To conﬁgure Freeway for loopback tests, you must have the following:

• a three-headed loopback cable (supplied by Simpact)

• for synchronous/isosynchronous protocols, a synchronous modem (you supply)

Select the ﬁrst pair of ports to loopback (usually port 0 and port 1 on ICP 0). Refer to

Section 4.1 on page 62 for a description of Freeway 2000 port numbering or Section 4.2

on page 66 for a description of Freeway 4000 port numbering. Attach one of the female

connectors on the loopback cable to one of the ports you have selected. Attach the other

female connector on the loopback cable to the other port you have selected. Attach the

male connector on the loopback cable to the modem.

You have now formed a loop between the two ports. Signals travel out of one port,

through the loopback cable, and back into the other port. The modem is attached to

supply a clock signal.

You can now perform the loopback test for the ﬁrst pair of ports. For the test proce-

dures, refer to the Loopback Test Procedures.

After you have performed the loopback test for the ﬁrst pair of ports, conﬁgure the

cables for the second pair of ports and conduct the loopback test again, and so on until

you have tested all of the ports. Then conﬁgure the cables for normal operation as

described in Section 4.3.1.

Caution

Use the loopback cable for testing only, not for normal operation.

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Motorola LM2000 Guía de instalación Pagina 76