Cisco WS-X3011 Configuratie Opmerking - Pagina 5

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Modem Connection

For a modem connection, use a standard modem (straight) cable.

ISDN Connections

Use a BRI cable (not included) to connect the router directly to an ISDN port. (See Table 2.)

Warning

detach the end away from the router ﬁrst to avoid possible electric shock. Network hazardous

voltages also are present on the system card in the area of the BRI port (RJ-45 connector), regardless

of when power is turned OFF. (To see translated versions of this warning, refer to the appendix

"Translated Safety Warnings" in the Catalyst 3100 Conﬁguration and Installation Guide.)

Warning

user contact. Do not attempt to tamper with or open any public telephone operator (PTO)-provided

equipment or connection hardware. Any hardwired connection (other than by a nonremovable,

connect-one-time-only plug) must be made only by PTO staff or suitably trained engineers. (To see

translated versions of this warning, refer to the appendix "Translated Safety Warnings" in the

Catalyst 3100 Conﬁguration and Installation Guide.)

Table 2 lists the speciﬁcations for ISDN BRI cables. Refer to the section "ISDN BRI Port and Cable

Pinouts" for pinouts.

Table 2

Speciﬁcation

Resistance (at 96 kHz)

Capacitance (at 1 kHz)

Impedance (96 kHz)

Wire diameter

Distance limitation

Synchronous Serial Connections

Before you connect a device to the synchronous serial port (labeled "SERIAL"), you will need to

know the following:

•

The type of device, DTE or DCE, you are connecting to the synchronous serial interface.

•

The type of connector, male or female, required to connect to the device.

•

The signaling standard required by the device.

DTE or DCE

A device that communicates over a synchronous serial interface is either a DTE or DCE device. A

DCE device provides a clock signal that paces the communications between the device and the

router card. A DTE device does not provide a clock signal. DTE devices usually connect to DCE

Network hazardous voltages are present in the BRI cable. If you detach the BRI cable,

The ISDN connection is regarded as a source of voltage that should be inaccessible to

ISDN BRI Cable Speciﬁcations

High-Capacitance Cable

160 ohms/km

120 nF

75 ohms

0.024 in. (0.6 mm)

32.8 ft (10 m)

nF = nanoFarad.

Low-Capacitance Cable

160 ohms/km

/km

30 nF/km

150 ohms

0.024 in. (0.6 mm)

32.8 ft (10 m)

Router Card (WS-X3011) Configuration Note

Modem Connection