Spectracom SecureSync User Manual

6.
The key(s) you have set up will now appear as options in the Symmetric Key field in both
the NTP Server screen, and the NTP Peer screen.
NOTES:
Duplicate key IDs are not permitted. NTP requests received by that do not contain an authen-
ticator containing a valid Key ID and MD5 message digest pair will be responded to, but no
authentication will be performed. An NTP request with valid authenticators results in a valid
NTP response with its own valid authenticator using the same Key ID provided in the NTP
request.
You may define the trusted Symmetric Keys that must be entered on both SecureSync, and any
network client with which SecureSync is to communicate. Only those keys for which the “Trus-
ted” box has been checked will appear in the dropdown menus on the NTP References screen.
2.14.10 NTP Access Restrictions
Next to encrypted authentication by means of Symmetric Keys, NTP supports a list-based means
of access restriction, the use of which is also recommended to prevent fraudulent or inadvertent
2.14 Configuring NTP
CHAPTER 2 • SecureSync User Reference Guide Rev. 26
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Spectracom SecureSync Specifications

General

Model	SecureSync
Time Reference	GPS, GLONASS, BeiDou, Galileo, IRIG, NTP, PTP, 1PPS
Disciplines	GNSS, IRIG, PTP, NTP, SyncE
Inputs	GPS, GLONASS, BeiDou, Galileo, IRIG, NTP, PTP, 1PPS
Outputs	NTP, PTP, 1PPS, IRIG
Protocols	PTP, NTP, SNMP, SSH, HTTPS
Form Factor	1U Rack-mount
Redundancy	Optional redundant power supply
Security Features	Password protection, access control lists, SSH, HTTPS, SNMPv3, NTP authentication, PTP authentication
Power Supply	100-240 VAC, 50-60 Hz
Operating Temperature	0°C to +50°C
Dimensions	44.45 mm (H) x 482.6 mm (W)