Справочник Пользователя для Hughes HN7700S

 

This chapter explains how to configure the HN router for Virtual 
Private Network Automatic Dial Backup (VADB) operation. The 
following topics are discussed:

• VADB overview on page 57
• Requirements for VADB on page 58
• Installing VADB on page 58
• LED appearance during VADB operation on page 65
• VADB troubleshooting on page 66

The VADB feature provides a phone-line backup capability to the 
HN router in case the DSL line fails or degrades below an 
acceptable threshold.

The HN router contains an internal modem to support VADB 
functionality. The HN router connects to a national network of 
dial access numbers, which are known as a Point of Presence 
(POP). Each POP acts as a Virtual Private Network (VPN) entry 
point into the customer’s network or the Internet. The HN router 
sends packets through the POP to the Network Operations Center 
(NOC), which forwards the packets to the destination server.

VADB automatically switches the HN router to a terrestrial 
dialup telephone network with minimal interruption and loss of 
customer traffic. VADB introduces no additional load on the HN 
router and does not affect any existing HN router features, but it 
does cause the HN router to send and receive traffic at a slower 
rate.