#
# CDDL HEADER START
#
# The contents of this file are subject to the terms of the
# Common Development and Distribution License (the "License").
# You may not use this file except in compliance with the License.
#
# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
# See the License for the specific language governing permissions
# and limitations under the License.
#
# When distributing Covered Code, include this CDDL HEADER in each
# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
# If applicable, add the following below this CDDL HEADER, with the
# fields enclosed by brackets "[]" replaced with your own identifying
# information: Portions Copyright [yyyy] [name of copyright owner]
#
# CDDL HEADER END
#
# Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
# Since in general, all NTP servers can be NTP clients and vice
# versa, all of the information in the /etc/inet/ntp.client file
# applies to NTP server setup as well. However, a certain kind
# NTP server, called a Stratum 1 server, has one or more devices
# designed to provide very accurate time to the server. These
# devices are configured using the "server" keyword, just as the
# servers used by the client are, but instead of a hostname or
# IP address, a format resembling an IP address is used. The first
# two octets of "127.127" are used to designate that this
# line is referring to a clock and not an network NTP server.
# The next octet is used to designate which type of device is used.
# And the last octet is used to specify a unit number if more than
# one is used. Notice that the resulting number looks like the
# localhost address, it is not the same. The real localhost
# address (127.0.0.1) does not have the second octet of 127 as
# the hardware clock designator does.
#
# XType Device RefID Description
# -------------------------------------------------------
# 1 local LCL Undisciplined Local Clock
# 3 pst WWV PSTI/Traconex WWV/WWVH Receiver
# 4 wwvb WWVB Spectracom WWVB Receiver
# 5 true TRUE TrueTime GPS/GOES Receivers
# 6 irig IRIG IRIG Audio Decoder
# 7 chu CHU Scratchbuilt CHU Receiver
# 8 parse ---- Generic Reference Clock Driver
# 9 mx4200 GPS Magnavox MX4200 GPS Receiver
# 10 as2201 GPS Austron 2201A GPS Receiver
# 11 arbiter GPS Arbiter 1088A/B GPS Receiver
# 12 tpro IRIG KSI/Odetics TPRO/S IRIG Interface
# 13 leitch ATOM Leitch CSD 5300 Master Clock Controller
# 17 datum DATM Datum Precision Time System
# 18 acts ACTS NIST Automated Computer Time Service
# 19 heath WWV Heath WWV/WWVH Receiver
# 20 nmea GPS Generic NMEA GPS Receiver
# 21 gpsvme GPS VME
# 22 atom PPS PPS Clock Discipline
# 26 hpgps GPS Hewlett Packard 58503A GPS Receiver
# 27 arc MSFa Arcron MSF Receiver
# 28 shm Shared memory driver
# 29 palisade Palisade
# 30 oncore Oncore
# 31 jupiter Jupiter GPS
# 32 chronolog Chronolog
# 33 dumbclock Dumbclock
# 34 ulink Ulink
# 35 pcf PCF
# 36 wwv WWV Audio
# 37 fg FG
# 38 hopfser HOPF Serial
# 39 hopfpci HOPF PCI
# 40 jjy JJY
# 41 tt560 TT560
# 42 zyfer ZYFER
# 43 ripencc RIPEENCC
# 44 neoclock4x NEOCLOCK 4X
# While all the current refclock drivers are configured and compiled,
# not all the actual hardware can be supported on all systems. The
# gpsvme driver can only be expected to work on systems with a VME
# bus. The WWV audio driver can only be used on systems with audio
# input.
#
# In general, refclock type 1, the LOCAL clock is not necessary and
# should not be configured. It should only be used when either there
# is some other process being used to synchronize the clock, such as
# with hardware with vendor provided drivers, or when it is desired
# that a server without access to a real NTP time source needs to
# act as a multicast or broadcast server. The LOCAL clock should not
# be configured as a "backup" to other external servers.
# Some of the devices have tuning parameters, called "fudge" factors,
# that can be set on the server line. See the ntpd documentation.