Lucent Technologies 555-024-402, Руководство пользователя

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Remote Port Security Device
User’s Guide
555-024-402
Issue 1
October 1996
Introduction
Page 1-3 RPSD System
1
Figure 1-1. RPSD Lock and Key Configuration
The system administrator administers the RPSD Lock via a direct connection
from an administration terminal to the Lock. The administration interface is menu
driven.
The RPSD system protects a port in the following manner: a call into the channel
to the protected host activates the RPSD Lock. Without involving the protected
host resource or its associated modem, the RPSD Lock verifies the caller’s
identity by using dual-tone, multifrequency (DTMF) signaling with the RPSD Key.
This process is as follows (see
Figure 1-1 ).
1. The Lock, installed on tip and ring on the network side of any modem or
protected host resource, answers the incoming call.
2. The Lock sends the caller a polling tone. If the calling party has an RPSD
Key, the Key responds with its User ID. If there is no Key on the calling
end, the Lock terminates the call.
3. The Lock must recognize the Key’s User ID (the Lock must be previously
initialized with all valid Keys); if not, the Lock terminates the call.
4. Using an algorithm governed by ANSI/DES standards, the Lock generates
a random 10-digit value (known as the “dynamic challenge,” for which
there are 10 billion possible values). Using a secret encryption key unique
to the calling RPSD Key’s User ID, the Lock encrypts the value.
DEFINITY RPSD
LOCK
POWER RING
IN
RING
OUT
CALL
OUT
LOCKED VERIFY CONNECTED
DEFINITY RPSD
KEY
POWER RING
IN
CALL
OUT
IDLE VERIFY CONNECTED
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