Spectracom SecureSync User Manual

Notes
The beginning of each 1.0 second time frame is identified by two consecutive 8.0ms elements
(P
0
and P
8
). The leading edge of the second 8.0ms element (P
R
) is the "on time" reference
point for the succeeding time code. 10pps position identifiers P
0
, P
1
, ..... P
8
(8.0 ms duration)
occur 10ms before 10pps "on time" and refer to the leading edge of the succeeding element.
The time code word and the control functions presented during the time frame are pulse-width
coded. The binary "zero" and index markers have a duration of 2.0ms, and the binary "one"
has a duration of 5.0 ms. The leading edge is the 100pps "on time" reference point for all ele-
ments.
The binary coded decimal (BCD) time-of-year code word consists of 30 digits beginning at
index count 1. The binary coded subword elements occur between position identifiers P
0
and
P
5
(7 for seconds; 7 for minutes; 6 for hours; 10 for days) until the code word is complete. An
index marker occurs between the decimal digits in each subword to provide separation for
visual resolution. The least significant digit occurs first. The BCD code recycles yearly.
Twenty-seven control functions occur between position identifiers P
5
and P
8
. FAA uses this field
to communicate satellite lock status and time error and indicators. The first flag element is at
530ms which indicates satellite lock. The ±1ms error flag occurs at 550ms. The ±5ms error
flag occurs at 560 ms. The ±50ms error flag occurs at 570ms. The ±500ms error flag occurs
at 580ms.
The straight binary (SB) time-of-day code word normally found between position identifiers P
8
and P
0
is eliminated for FAA IRIGB. All elements between position identifiers P
8
and P
0
are set
to Binary0.
5.5.4 IRIG E Output
The IRIG E code contains the Binary Coded Decimal (BCD) time of year and Control Functions.
The figure IRIG E Time Code Description illustrates the IRIG E data structure. The BCD time of
year provides the day of year, 1-366, and time of day to tens of seconds. The hour of the day
is expressed in 24 hour format. The Control Function field includes a time synchronization
status bit, year information and SBS time of day.
Time frame: 10 seconds.
Code Digit Weighting:
Binary Coded Decimal time of year.
Code world - 26 binary digits.
Tens of seconds, minutes, hours, and days.
Recycles yearly.
554 SecureSync User Reference Guide
APPENDIX

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)