ADTRAN Express 4120 Bedienungsanleitung PDF herunterladen (Seite 44)

Chapter 1. Understanding ISDN and the Express 4110/4120

1-14 Express 4110/4120 User Manual 61200176L3-1

Network Address Translation Mode

NAT is a special mode of operation in which the Express 4110/4120

obtains a dynamically assigned IP address from the peer router (typically

an Internet Service Provider). This allows a network of computers to ben-

efit from Ethernet to ISDN speeds while still appearing to the Internet Ser-

vice Provider (or central site router) as a single IP address, which is

typical of PC based serial dial-up solutions.

A call is initiated to the ISP using the Dial menu or demand for a Connec-

tion List profile that has the IP parameter NAT set to Yes. The network

computer’s IP stack may use DHCP to request an IP address, default gate-

way address, and domain name server addresses from the Express 4110/

4120.

Front Panel

Figure 1-11 on page 1-14 shows the front panel of the Express 4110. Figure

1-12 on page 1-15 shows the front panel of the Express 4120. The indica-

tors are divided into LAN functions, WAN functions, and Test functions.

Figure 1-11. Express 4110 LEDs

Express 4110 LAN Indicators

TX/RX Flashes green when transmitting data onto the 10BaseT

connector.

Flashes yellow when receiving data from the 10BaseT

connector.

LI Link integrity. Illuminates when there is a good connection between

the Express 4110 and a NIC card.

Express 4110

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ADTRAN Express 4120 Bedienungsanleitung Seite 44