Ross 4500DR-104-07, User Manual, Page: 129 / 161

SRG-4500 User Guide (v7.0) NTP Option • 129
NTP Option
The SRG-4500 always contains the hardware and associated circuitry necessary to allow operation of the NTP
Option. This chapter provides information on the NTP option for your SRG-4500.
 An Option Key is required to enable the NTP Option. No additional externally connected hardware is required as
part of the installation. A power cycle may be required to complete the update process.
SRG-4500 SNTP Best Practices
The SRG-4500 implements an optional Simple Network Time Protocol (SNTP) service, operating as either a client
or as a primary server. SNTP is a subset of NTP, per RFC5905 . SNTP allows operation as a primary master (locked
to a single reference clock) or as a client (with the unit locking to a single upstream server). ( Figure 15.1 ) NTP
operates in a hierarchical system.
Figure 15.1 Example of an SNTP Setup with the SRG-4500
1 2 3 4 10.xx.x.xx
Slot 4 OK
ACO-2200 CHANGEOVER
1 2 3 4 ACO-2200
10.xx.xx.xx
FAULT
AUTO
MANUAL
PRIMARY
BACKUP
LOCK
UNLOCK
SRG-2200 SYNC GENERATOR
1 2 3 4 SPG-2200
10.xx.xx.xx
FAULT
SRG-2200 SYNC GENERATOR
1 2 3 4 SPG-2200
10.xx.xx.xx
FAULT
1 2 3 4 IP: ###.###.##.###
GPS Antenna GPS Antenna
SRG-4500 SYNC GENERATOR SRG-4500 SYNC GENERATOR
Corporate or Public
Time Servers