Cisco Systems CISCO1751 Determining Voice Port Numbering, ISDN BRI Card LEDs, NT Interface use

Installing WAN and Voice Interface Cards

Note When the interface is configured as NT and is connecting to a TE device, the cable must have the transmit and receive pins swapped (crossover cable). (See Table 3.)

Table 3	Interface Pin Numbers and Functions
		NT Interface (use	TE Interface (use
ISDN BRI NT/TE		straight-through cable)	crossover cable)
Pin 3/T+		Pin 3/R+	Pin 3/T+
Pin 4/R+		Pin 4/R+	Pin 4/R+
Pin 5/R-		Pin 5/T-	Pin 5/R-
Pin 6/T-		Pin 6/R-	Pin 6/T-

Step 3 Connect the other end to the RJ-45 wall outlet.

ISDN BRI Card LEDs

ISDN BRI voice interface cards have three LEDs, as listed in Table 4.

Table 4 ISDN BRI Voice Interface Card LEDs

LED

B1

B2

OK

Meaning

Call active on B1 channel

Call active on B2 channel

Interface is connected to an ISDN network

If you have additional cards to install, proceed to the appropriate sections in this manual. When you have finished all installations, see the Cisco 1751 Router Software Configuration Guide available on the Documentation CD-ROM.

Determining Voice Port Numbering

Enter the show voice port command to identify the port numbers of voice interfaces installed in your router:

Router# show voice port slot-number/port

Figure 8 on page 9 shows Cisco 1751 router slot numbering.

Cisco 1751 Voice-over-IP Quick Start Guide

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