GPS Clock Jumpering

IceCube currently uses a ET-6000 GPS clock at the south pole, and at other institutions in the IceCube project. Local requirements prompt adjustments t othe factory jumper configuration. Namely:
DFL
NPX 2005
NPX 2006...
Jumpers

Factory Jumpering

Figure 2-3, page 2-8, of the manual for the ET-6000 GPS clock shows the push-on jumper configuration used by the factory. Changing the jumpering requires the removal of the top cover (many #1 Philips screws). Changing the jumpers can be done by any competent electrical technician, when the unit is unplugged from 115V input.. Electrostatic precautions are required when working inside the unit.

Rear Jack	MUX Jumper	Position	Signal
J4	JU14	7-8	\Tracking
J5	JU15	7-8	\Locked
J6	JU16	1-2	MUX Ch 3
J7	JU17	5-6	10 MHz Sine
J8	JU18	3-4	AC Code Out
J9	JU19	1-2	MUX Ch 1

Jumpering for the DFL (2005)

The jumpering chosed for the DFLs maximizes the availability of pairs of 1Hz and 10 MHz outputs based on the assumption that multiple DOM Hubs will be driven directly by the ET-6000. (No active or passive clock fan-out between clock and hubs)

Rear Jack	MUX Jumper	Position	Signal
J4	JU14	1-2	MUX Ch 1
J5	JU15	1-2	MUX Ch 2
J6	JU16	1-2	MUX Ch 3
J7	JU17	5-6	10 MHz Sine
J8	JU18	1-2	MUX Ch 2
J9	JU19	1-2	MUX Ch 1

Section 3.3.9 of the manual explains the setting of MUX selections, as well as listing the names of the signals that can be chosen.
This jumpering goes along with a usage recommendations page.

Jumpering for the South Pole (2005)

Rear Jack	MUX Jumper	Position	Internal Signal	Selected Signal
J4	JU14	1-2	MUX Ch 1	1 Hz (~80% high)
J5	JU15	1-2	MUX Ch 2	1 Hz (~80% high)
J6	JU16	1-2	MUX Ch 3	1 Hz (~80% high)
J7	JU17	5-6	10 MHz Sine
J8	JU18	1-2	MUX Ch 2	1 Hz (~80% high)
J9	JU19	1-2	MUX Ch 1	1 Hz (~80% high)

In addition to the above jumpering, the primary ET-6000 at pole contains two Shaper Board Assembly cards which plug into the optional 35007 Mother Board; they drive outputs J3D and J3E with 10 MHz Sine wave signals (signals just like J7).
The first year clock distribution uses passive fan-outs to turn 8 single outputs into 9 pairs of outputs.
The first year clock distribution also depends on delivering time-string bursts from the "printer" port, J11, to the serial string input connectors of the DSB cards, all in parallel, with a custom made distribution cable.
The phase relationship between the 1 Hz and 10 MHz signals is controlled by "tuning" cable lengths in order to achieve the desired result of having the 10 MHz signal lead the 1 Hz signal by approximately 8ns. (measurement at the end panel of the DSB)

Jumpering for the South Pole (2006...) (proposed 6/24/05)

Rear Jack	MUX Jumper	Position	Internal Signal	Selected Signal and Destination
J4	JU14	1-2	MUX Ch 1	AMANDA repeater (10 MHz)
J5	JU15	1-2	MUX Ch 2	AMANDA repeater (1 PPS)
J6	JU16	1-2	MUX Ch 3	ANANDA IRIG (DC CODE)
J7	JU17	5-6	10 MHz Sine
J8	JU18	1-2	MUX Ch 2	IceCube Clock Fan-out (1PPS)
J9	JU19	1-2	MUX Ch 1	IceCube Clock Fan-out (10 MHz)

The IceCube clock fan-out also requires the time-string burst from the ":printer" port J11.

The Jumpers