Avaya Troubleshooting Routers Instrukcja Naprawy Pobierz pdf (Strona 136)

Troubleshooting Routers

6-26

308656-14.00 Rev 00

When the router detects that DSR is in the on state (positive voltage), it brings

DTR high regardless of the state of the primary line. This causes the modem

to dial. If the router does not detect any DSR (negative voltage), the router

brings DTR high, which causes the modem to dial.

If the router’s connection to the modem is a 44-pin synchronous

interface, and the modem is a master, make sure the modem can send the

ring indicator (RI) signal from Pin 22 to the router interface in the

control off state (negative voltage).

Most RS-232 modems support this control signal. If the modem does not

support this control signal, use the Configuration Manager to edit the

connector of the backup line, click on Modem, and disable RI.

The RS-232 pin assignments are as follows:

• RI: Pin 22

• DCD: Pin 8

• DTR: Pin 20

• DSR: Pin 6

Troubleshooting V.35 Raise DTR Dial (Balanced)

If the DTR is up when it should not be, causing the modem or CSU to initiate a

dial sequence, do the following:

If the router’s connection to the modem or CSU is a 44-pin synchronous

interface, and the modem is a master, make sure the modem or CSU can

send the RI signal from Pin J to the router interface in the control off

state.

Some CSUs do not support the Pin J, RI signal. If the modem or CSU does not

support this control signal, use the Configuration Manager to edit the

connector of the backup line, click on Modem, and disable RI.

If the CSU does not supply RI Pin J, you can create a custom cable to use

another signal, such as RLSD (received line signal detection) Pin F, as RI

Pin J. RLSD is typically low until the modem establishes a connection, and

goes low again after DTR toggles.

Note:

Disabling RI on the router has no effect in this case. The absence of the

RI control signal at the master side causes DTR to go high.

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Avaya Troubleshooting Routers Instrukcja Naprawy Strona 136