System management Chapter 1: Product description
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phn-2513_004v000 (Oct 2012)
Simple Network Time Protocol (SNTP)
The clock supplies accurate date and time information to the system. It can be set to run
with or without a connection to one or two network time servers (SNTP). It can be
configured to display local time by setting the time zone and daylight saving in the Time
Configuration web page.
If an SNTP server connection is available, the clock can be set to synchronize with the
server time at regular intervals. For secure applications, the PTP 800 can be configured to
authenticate received NTP messages using the DES or MD5 protocol.
SNMPv3 security
SNMP Engine ID
PTP 800 supports three different formats for SNMP Engine ID:
• MAC address
• IP address
• Configurable text string
SNMPv3 security configuration is re-initialized when the SNMP Engine ID is changed.
User-based security model
PTP 800 supports the SNMPv3 user-based security model (USM) for up to 10 users, with
MD5, SHA-1, DES and (subject to the license key) AES protocols in the following
combinations:
• No authentication, no privacy,
• MD5, no privacy,
• SHA-1, no privacy,
• MD5, DES,
• SHA-1, DES,
• MD5, AES,
• SHA-1, AES.
Use of AES privacy requires the AES upgrade described in AES license on page 1-60. The
system will allow the creation of users configured with AES privacy protocol, regardless of
license key. However, a user configured to use AES privacy protocol will not be able to
transmit and receive encrypted messages unless the license key enables the AES
capability.
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