Datum TYMSERVE 2000 User manual

TYMSERVE 2000
NETWORK TIME SERVER
Operation and Technical Manual

TYMSERVE 2000
NETWORK TIME SERVER
Operation and Technical Manual
OCTOBER 1995

TYMSERVE 2000
NETWORK TIME SERVER
TABLE OF CONTENTS
SECTION PAGE
CHAPTER 1
INTRODUCTION
1.0 General 1-1
1.1 TYMSERVE 2000 Features 1-1
1.2 TYMSERVE 2000 Overview 1-2
CHAPTER 2
INSTALLATION
2.0 General 2-1
2.1 Ethernet Connection 2-1
2.2 Ti ing Source 2-1
2.3 Antenna Installation (-GPS Version Only) 2-1
CHAPTER 3
OPERATION AND NETWORK INTERFACE
3.0 General 3-1
3.1 Operation 3-1
3.2 Network Interface 3-1
3.3 Serial Port Data For at 3-1
3.4 NTP Data For at 3-2
CHAPTER 4
MENU SYSTEM
4.0 General 4-1
4.1 TYMSERVE 2000 Front Panel 4-1
4.2 Entering the Menu Syste 4-2
4.3 Modifying Network, Ti ing, and Feature Para eters 4-3
4.4 Viewing and Saving Info 4-3
4.5 Saving Para eters 4-4
4.6 Exiting the Menu Syste 4-4

4.7 Network Para eter Description (All Versions) 4-4
4.8 Ti ing Para eter Description (-GPS, -IRIG) 4-5
4.9 Feature Para eter Description (-GPS, -IRIG) 4-6
4.10 Infor ation Description (-GPS, -IRIG) 4-7

TABLE OF CONTENTS (Con inued)
SECTION PAGE
4.11 Ti ing Para eter Description (-ACTS) 4-8
4.12 Feature Para eter Description (-ACTS) 4-9
4.13 Infor ation Description (-ACTS) 4-10
CHAPTER 5
INPUT/OUTPUT CONNECTORS
5.0 General 5-1
5.1 Ethernet AUI Connector 5-1
5.2 Serial Port Connector 5-1
5.3 RJ11 Connectors 5-1
5.4 AC Power Entry Module5-1
5.5 Ti e Code in BNC (-GPS, -IRIG) 5-1
5.6 DCLS out and Ti e Code out BNC (-GPS, -IRIG) 5-1
5.7 1 PPS out BNC (-GPS, -IRIG) 5-1
5.8 Freq out BNC (-GPS, -IRIG) 5-2
5.9 Periodic out BNC (-GPS, -IRIG) 5-2
5.10 1 PPS in BNC (-GPS, -IRIG) 5-2
5.11 10 MHz in BNC (-GPS, -IRIG) 5-2
5.12 SPARE1 and SPARE2 BNC (-GPS, -IRIG) 5-2
5.13 GPS Antenna Connector (-GPS) 5-2
5.14 CHANNEL 1 - 8 output BNCs (-GPS, -IRIG with -TDM Option) 5-2
APPENDIX A
TROUBLESHOOTING GUIDE
A.0 General A-1
A.1 Ti ing Source Proble s A-1
A.2 Network Connection Proble s A-1
A.3 Miscellaneous Proble sA-2
APPENDIX B
NTP AUTHENTICATION
B.0 General B-1
B.1 Authentication Mechanis B-1
B.2 Progra ing and Storage of Key Identifier/Key Pair B-1
B.3 Public Do ain XNTP Package B-1
B.4 NTP Authentication ONLY B-2
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TABLE OF CONTENTS
TABLE OF CONTENTS (Con inued)
SECTION PAGE
APPENDIX C
SNMP
C.0 General C-1
C.1 Datu MIB Extension C-1
C.2 Additional Stored MIB Variables C-9
C.3 MIB Co pilation C-9
C.4 Security C-9
C.4.1 SNMPv1 C-10
C.4.2 SNMPv2 C-10
C.4.2.1 SNMPv2 Parties C-10
C.4.2.2 SNMPv2 Access Control C-15
C.4.2.3 SNMPv2 Contexts C-15
C.4.2.4 SNMPv2 Views C-16
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CHAPTER 1
INTRODUCTION
1.0 GENERAL
The TYMSERVE 2000 Network Ti e Server Operation and Technical Manual provides the
following infor ation:
- General Infor ation and Specifications
- Installation
- Operation and Network Interface
- Input/Output Connectors
1.1 TYMSERVE 2000 FEATURES
The salient features of the TYMSERVE 2000 include:
- User selectable ti e sources (-GPS, -IRIG versions):
GPS Satellite Receiver (-GPS version only)
IRIG B ti e code
Free running internal clock (ti e set by user)
External 1 PPS input
- -ACTS version uses the NIST Auto ated Co puter Ti e Service via telephone for
ti ing.
- Co patible with NTP (Network Ti e Protocol) Version 2 and 3.
- Supports both the DIX Ethernet and IEEE 802.3 (w/802.2 headers) ethernet fra e
for at. Connection via an AUI connector.
- Provides re ote status and configuration with both SNMPv1 and SNMPv2 using MIB-
II and a custo MIB extension.
- Provides a enu driven interface for setting up the Internet address and various other
para eters.

- Front panel ti e display (UTC or local ti e.)
- Provides rear panel Ethernet AUI and signal in/out.
- Provides IRIG B Ti e Code Output synchronized to the input ti e source (-GPS,
-IRIG versions only).

- Provides a 1 PPS (Pulse Per Second) output synchronized to the input ti e source (-
GPS, -IRIG versions only).
- Provides a 1, 5, or 10 MHz TTL output synchronized to the input ti e source (-GPS,
-IRIG versions only).
- Flywheels through loss of the ti ing signal to provide continuous NTP ti e service and
output ti e code.
- Optional rack ount ears. 1 3/4" high.
- Optional 8 ti e code output buffer (-TDM).
1.2 TYMSERVE 2000 OVERVIEW
The TYMSERVE 2000 is a self-contained pri ary ti e server which uses GPS (-GPS version
only), IRIG B ti e code, an internal free running clock, an external 1 PPS input, or (-ACTS
only) the NIST Auto ated Co puter Ti e Service (ACTS) as its ti e source. Utilizing the NTP
protocol (version 2 RFC-1119 and version 3 RFC-1305) over an Ethernet, the user can aintain
ti e synchronization a ong all co puters connected to the network. The NTP Server provides
the ti e server function which synchronizes other hosts on the network, and is never
synchronized by these other hosts. Utilizing NTP, synchronization of hosts to within 1
illisecond of the input ti e source is achievable under the best conditions. The -ACTS version
provides ti ing accuracies to within 10 s of UTC, but will still synchronize hosts to within 1
s of the TYMSERVE.
The -GPS and -IRIG versions of the NTP Server provide an IRIG B ti e code output
synchronized to the input ti e source. By using a ti e code reader odule installed in the users
co puter, ti e can be obtained (fro the reader) to accuracies on the order of 20 μsec.
Banco offers ti e code reader odules for the IBM PC bus, VMEbus, Qbus, STD bus, and
SBX bus.
The principal perfor ance characteristics are listed in Table 1-1.
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Table 1-1: TYMSERVE 2000 Performance Specifica ions
I em Descrip ion
Ne work In erface
Ethernet Fra e For at DIX Ethernet (Ethernet II, Bluebook)
or IEEE 802.3 with 802.2 headers.
Connection AUI Connector
Ti e Server Protocol NTP Version 2 (RFC-1119)
NTP Version 3 (RFC-1305)
SNMP Protocol SNMPv1 (RFC-1157)
SNMPv2 (RFC-1451 and associated RFCs)
Time Code Inpu
For at IRIG B
A plitude 500 Vpp to 5 Vpp
Input I pedance 10K Oh s
Flywheeling < 2 s per hour (during loss of ti e code)
Time Code Ou pu
For at IRIG B, odulated and DCLS
A plitude 3 Vpp (no inal for odulated output)
GPS Receiver (-GPS version only)
Channels 6
Frequency 1.575 GHz, C/A Code
Digi al Ou pu s
Drive TTL, > 2.5V into 75 Oh s
-ACTS Timing
Accuracy ± 10 s (to UTC) at ti e of call
Drift Rate 10 s / hour @ 23o C ± 5o C
Chassis
AC Power In 110-120/220-240 VAC, 20W, 50/60 Hz
(factory configured for 110 or 220)
Size 1.75"(H) X 14.25"(W) X 12"(D)
(19"(W) with rack ount ears)
Opera ing and S orage Environmen s
Te perature
Operating 0o C to 55o C
Non-Operating -50o C to 125o C
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TYMSERVE 2000
Relative Hu idity
Operating 10% to 80% (non-condensing)
Non-Operating 5% to 95% (non-condensing)
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CHAPTER 2
INSTALLATION
2.0 GENERAL
The NTP Server is a self-contained chassis (desk top or rack ount) equipped with a bc620AT
Ti e and Frequency Processor, CPU Module and an Ethernet Module. This section details the
steps required to install the TYMSERVE 2000 Network Ti e Server.
2.1 ETHERNET CONNECTION
The Server provides a standard AUI connector on the rear panel of the unit. The Server is
connected to the network via this AUI connector. The connection can be ade directly to a
ultiport transceiver, or to a thick net or thin net MAU provided by the user.
The Internet address, subnet ask, default gateway, and Ethernet fra e for at of the
TYMSERVE ust be changed by the user. Refer to Chapter 4 (Menu Syste ) for details on
changing the TYMSERVE network para eters.
2.2 TIMING SOURCE
The TYMSERVE 2000 can use its internal clock as the ti ing source, but ost applications will
require an external ti ing source such as ti e code or GPS. Refer to Chapter 4 for details on
selecting a ti ing source. Refer to Chapter 5 for details on connecting an external ti ing source
to the TYMSERVE 2000.
2.3 ANTENNA INSTALLATION (-GPS version only)
The ost co on difficulty encountered using GPS equip ent is antenna position. The GPS
antenna ust be located in an area which has a clear view of the sky. The GPS signals cannot
penetrate foliage or structures. It is strongly reco ended that the user take the ti e to properly
position the antenna.
The GPS antenna is connected to the TYMSERVE 2000 rear panel connector labeled 'GPS
ANTENNA'. The GPS antenna connector is a 15 pin high density 'D' type connector.

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CHAPTER 3
OPERATION AND NETWORK INTERFACE
3.0 GENERAL
The TYMSERVE 2000 ti e data is accessed via the Ethernet connection by hosts utilizing NTP
(Network Ti e Protocol) over UDP/IP. Ti e is also available via the IRIG B ti e code signal
provided as a rear panel output (see Chapter 5 Input/Output Connectors.)
3.1 OPERATION
The operation of the TYMSERVE is quite si ple. First, use the enu syste (See Chapter 4
Menu Syste ) to set the Internet address and various other para eters. Connect the ti ing
signal (GPS, ti e code, etc.) to the unit. Then connect to the Ethernet. On the user's host
achines, ake the host NTP dae on aware of the TYMSERVE's Internet address. The NTP
dae on will then take care of aintaining ti e synchronization.
The front panel LCD display of ti e can be onitored to verify that the TYMSERVE is
aintaining ti e properly. When a loss of ti e source occurs, the ti e display will show the
word 'FLY' to indicate that it is flywheeling (i.e. aintaining ti e when the ti e source is lost).
Once ti e is initially acquired, the TYMSERVE will continue to provide ti e even if the ti ing
signal is lost. The NTP essage returned by the TYMSERVE will indicate (via the Reference
Ti esta p) when it last obtained ti e updates fro the ti ing signal.
3.2 NETWORK INTERFACE
The TYMSERVE 2000 is co patible with NTP versions 2 and 3 as described in RFC-1119 and
RFC-1305 by David L. Mills of the University of Delaware. Hosts wanting to be synchronized
should be running a copy of the public do ain NTP dae on (or so e equivalent progra .) If an
NTP dae on is not available on your syste the user can obtain a copy of RFC-1119 (available
via FTP or E-Mail fro the Network Infor ation Center NIC) in order to i ple ent an NTP
dae on for their syste . Details of the NTP protocol and synchronization techniques are
beyond the scope of this anual.
3.3 SERIAL PORT DATA FORMAT
The TYMSERVE trans its UTC ti e via the rear panel serial port connector once per second as

an ASCII string (-IRIG, -GPS only). The Carriage Return character is trans itted on-ti e. The
for at of the serial port data is shown below. To start the ti e trans issions send the
TYMSERVE a 'c' or 'C' character via the serial port. To stop the ti e trans issions send an 'r' or
'R' character. Refer to Chapter 4 for infor ation on setting up the serial port protocol. Refer to
Chapter 5 for a description of the Serial Port connector.

The following ti e infor ation string is trans itted once per second (when started with the 'c' or
'C' character). The 'DDD' field represents 3 ASCII digits of days (001 - 366), etc. The Quality
Indicator indicates the validity of the ti e. The Carriage Return character is trans itted on-ti e.
The first rising edge of the Carriage Return character occurs within 200 μsec after the
TYMSERVE 1 PPS signal transitions fro low to high.
(SOH)DDD:HH:MM:SSQ(CR)(F)
FIELD DESCRIPTION
(SOH) (0x01) ASCII Start of Header
DDD Day of year
HH Hours (24-hour clock)
MM Minutes
SS Seconds
Q Quality Indicator (space = nor al operation)
(CR) (0x0D) ASCII Carriage Return (trans itted on-ti e)
(LF) (0x0A) ASCII Line Feed
QUALITY CHAR DESCRIPTION
space Nor al operation, ti e set and not flywheeling
X Ti e not set yet
F Ti e was set, but currently flywheeling
3.4 NTP DATA FORMAT
The for at of the NTP essage data area, which i ediately follows the UDP header, is shown
in Figure 3-1. The NTP essage fields are described below. The TYMSERVE 2000 does not
i ple ent the optional Authenticator field.
NTP ti esta ps are represented as a 64-bit unsigned fixed-point nu ber, in seconds relative to
0h on 1 January 1900. The integer part is in the first 32 bits and the fraction part in the last 32
bits.
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TYMSERVE 2000
0 8 16 24 31
LI VN MODE Stratu Poll Precision
Synchronizing Distance ( Root Distance ) ( 32 bits )
Synchronizing Dispersion ( Root Dispersion ) (32 bits )
Reference Identifier ( 32 bits )
Reference Ti esta p ( 64 bits )
Originate Ti esta p ( 64 bits )
Receive Ti esta p ( 64 bits )
Trans it Ti esta p ( 64 bits )
Authenticator ( optional ) ( 160 bits )
Figure 3-1: NTP Message Data
Leap Indica or (LI): This is a two-bit code warning of an i pending leap second to be
inserted/deleted in the last inute of the current day, with bit 0 and bit 1, respectively, coded as
follows:
00: no warning
01: last inute has 61 seconds
10: last inute has 59 seconds
11: alar condition (clock not synchronized)
When the TYMSERVE 2000 is first powered on (i.e. before ti e is initially acquired fro the
ti ing signal) and when the ti ing para eters are changed, the alar condition will be
indicated. This condition will persist until the TYMSERVE acquires ti e and should not be set
again until the unit is powered off and on.
Version Number (VN): This is a three-bit integer indicating the NTP version nu ber. The
TYMSERVE will return the version nu ber fro the inco ing NTP essage.
Mode: This is a three-bit integer indicating the ode. For the TYMSERVE this field is set to
four (4) indicating the server ode. The TYMSERVE always operates in server ode which
eans that it will synchronize hosts but will never be synchronized by hosts.
S ra um: This is an eight-bit integer indicating the stratu level of the local clock. For the
TYMSERVE 2000 this field is set to one (1) indicating a pri ary reference.
Poll In erval: This is an eight-bit signed integer indicating the axi u interval between
successive essages, in seconds to the nearest power of two. The TYMSERVE will return the
poll interval fro the inco ing NTP essage.
Precision: This is an eight-bit signed integer indicating the precision of the local clock, in
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TABLE OF CONTENTS
seconds to the nearest power of two. For the TYMSERVE this field is set to -19 which is the
value closest to the 1 μsec precision of the TYMSERVE.
Synchronizing Dis ance (Roo Dis ance Version 3): This is a 32-bit fixed-point nu ber
indicating the esti ated roundtrip delay to the pri ary synchronizing source, in seconds, with
fraction point between bits 15 and 16. Set to 0 in the TYMSERVE.
Synchronizing Dispersion (Roo Dispersion Version 3): Synchronizing Dispersion is a 32-bit
fixed-point nu ber indicating the esti ated dispersion to the pri ary synchronizing source, in
seconds. Root Dispersion indicates the axi u error relative to the pri ary reference source.
Currently set to 0 in the TYMSERVE.
Reference Clock Iden ifier: This is a 32-bit code identifying the particular reference clock. In
the case of stratu 1 (pri ary reference), this is a four-octet, left justified, zero-padded ASCII
string. For the TYMSERVE the four-octet string is dependent on the ti e source selected as
follows:
Ti e Source Four-octet String
GPS 'GPS'
IRIG B Ti e Code 'IRIG'
Free Running Clock 'FREE'
Ext. 1 PPS Input '1PPS'
NIST ACTS 'NIST'
Reference Times amp: This is the local ti e at which the local clock was last set or corrected,
in 64-bit ti esta p for at. With the TYMSERVE the Reference Ti esta p is the last ti e that
a valid ti ing signal was detected. Therefore, the Reference Ti esta p will indicate the ti e at
which the ti ing signal was lost. When the ti ing signal returns, the Reference Ti esta p will
be updated.
Origina e Times amp: This is the local ti e at which the request departed the client host for
the service host, in 64-bit ti esta p for at.
Receive Times amp: This is the local ti e at which the request arrived at the service host, in
64-bit ti esta p for at.
Transmi Times amp: This is the local ti e at which the reply departed the service host for the
client host, in 64-bit ti esta p for at.
Au hen ica or: This field contains 4 bytes of key identifier followed by 16 bytes of MD5 digest.
The data is validated when authentication is enabled.
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CHAPTER 4
MENU SYSTEM
4.0 GENERAL
The TYMSERVE 2000 provides a enu syste accessible via the front panel keyboard and
LCD display for setting the Internet address and other para eters. These para eters are stored in
EEPROM (-ACTS version also uses battery backed SRAM for so e para eter storage) to
sustain these settings during loss of power to the Server.
4.1 TYMSERVE 2000 FRONT PANEL
The TYMSERVE 2000 front panel (shown in Figure 4-1) provides a 2 line by 40 character LCD
backlit display, a keyboard, and the power on/off switch. The ain display screen shown in
Figure 4-1 displays the user's local ti e. If the ti ing source is lost, the word 'FLY' (-GPS,
-IRIG) is also displayed to indicate that the TYMSERVE is 'flywheeling'. The -ACTS version
displays call and phone line status on the front panel.
Figure 4-1:
TYMSERVE 2000
Front Panel
LCD DISPLAY: 2 line by 40 character LCD backlit display.
NUMERIC KEYS: Used for entering nu eric data and for enu selections.
NEXT, PREV:Used for traversing the enu areas. The NEXT key is also used as an
auxiliary character key (i.e. '.' or '-') for para eter entry. The PREV key is also
used as a backspace key for para eter entry.
MENU: Used to enter the enu syste , and to escape para eter entry.
ENTER: Used to enter para eters.
MENUNEXT
PREV ENTER
0 1
5 6
2
7
3 4
8 9
OFF
ON
TYMSERVE 2000 NETWORK TIME SERVER
Thu Apr 20 12:20:45 1993 FLY