Have Quick Input Specifications; Have Quick Signal Characteristics - Symmetricom XLi User Manual

S S S S S S S S S
High Level:
Low Level:
Synchronization edge:
Impedance:
Qty:
Connector:

Have Quick Input Specifications

Accuracy:
Stability:
High Level:
Low Level:
Impedance:
Qty:
Connector:
CPU Aware

Have Quick Signal Characteristics

The Have Quick signal employs bi-phase (Manchester II) transmission at approximately 1667 bits per
second. A one is defined as 300 microseconds of a low state followed by 300 microseconds of a high
state. A transmission of 240 milliseconds of logic ones (400 bits) precedes the start of message indicator
(16 bits) and time, day of year, year and TFOM message (96 bits).
The transmission is initiated on a time mark, so that the first bit of the 400 "ones" starts within 10
microseconds of the leading edge of the 1PPS.
The start of message indicator that follows the "ones" verifies that the time, day of year, year and TFOM
message will follow. Each 8 bit character in the data message (time of day, day of year, year and TFOM)
is defined by a modified 8:4 Hamming Code. The two start of message characters (8 bits each) are not in
the modified Hamming Code.
The modified Hamming code employs 4 parity bits and 4 data bits for each 8 bit character.
XLi Time & Frequency System
XLi-man, Issue 8, 6/17/2008, Rev. H
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S S S S S S S S S
-10
2 x 10 @ 1000 sec
-12
3 x 10 @ 1 day
Logic Hi > 1.25V < 10V
Logic Low < 1.25V > 0V
Positive
1 kΩ to ground
1
BNC female
μ
1 S
-9
1 x 10 @ 1 sec
-10
2 x 10 @ 1000 sec
-12
3 x 10 @ 1 day
Logic Hi >4.5V and Max. 5.5V
Logic Low <+0.5V and Min. 0V
1kΩ to ground
1
BNC female
Yes
S S S S S S S S S S S S S S S S S S
2
1
5
S S S S
217