Adtran 4120 사용자 설명서

Chapter 1.  Understanding ISDN and the Express 4110/4120

1-14

Express 4110/4120 User Manual

61200176L3-1

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. 

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.

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