T_M_SHAW 060396

Revised 6/14/96

**Proposal for Master Clock Fanout Cable and TSI Return Cable**

A set of proposals were made at the end of the CDF infrastructure
meeting on May 22, 1996 on how to cable the TSI return signals and the
Master Clock. What follows is the result after feedback from all (we
hope) systems.

**Master Clock Fanout Cabling**

\- Assume the use of National's LVDS differential line drivers and
receivers. P/Ns are DS90C032 and DS90C32. Testing done by Steve Chappa
has verified that there are no problems with these devices.

\- Cable Termination at the Receiver end should consist of a SMT
resistor (100 ohms) across the differential inputs which matches the
cable impedence.

\- While most systems require 4 signals, at least one system (SVX) has
identified the need for five signals. It was decided at the clock
meeting on 6/13/96 to simply run an additional "CABLE B" to such
systems. CABLE B will contain the 53Mhz clock required by SVX.

This decision allows us to continue to use the high quality Category 5
cable we have tested (4 pair limit), as well as the connectors. CABLE A
and CABLE B will have different keys to prevent them from being switched
at front panels.

**CABLE PINOUT for CDF Readout Crate with TRACER**

**CABLE A**

**[Pin]{.underline}** **[Signal]{.underline}**

1 Master_Clock (132 ns clock)

2 Master_Clock\*

3 Beam_Crossing

4 Beam_Crossing\*

5 Beam_Zero (once around marker)

6 Beam_Zero\*

7 Abort_Gap

8 Abort_Gap\*

**CABLE B**

Not Required

**CABLE PINOUT for "SVX-like" Readout Crate**

**CABLE A**

**[Pin]{.underline}** **[Signal]{.underline}**

1 Sync (one tick every 132 ns clock)

2 Sync\*

3 Beam_Crossing

4 Beam_Crossing\*

5 Beam_Zero (once around marker)

6 Beam_Zero\*

7 Abort_Gap

8 Abort_Gap\*

**CABLE B**

**[Pin]{.underline}** **[Signal]{.underline}**

1 53MHz_Beam_Clk (one tick every 132 ns clock)

2 53MHz_Beam_Clk\*

3 N/C

4 N/C

5 N/C

6 N/C

7 N/C

8 N/C

**BOARD MOUNT CONNECTORS**

(AMP Catalog 82101)

**CABLE A**

AMP Shielded Data Link Connectors, 8 Conductor, Side Entry Panel and PCB
Ground

**Part \# 3-520459-3**

(Note: this part uses the **"C"** key to distinguish it from the TSI
return cable)

**CABLE B**

AMP Shielded Data Link Connectors, 8 Conductor, Side Entry Panel and PCB
Ground

**Part \# 5-520459-3**

(Note: this part uses the **"E"** key to distinguish it from the TSI
return cable)

**CABLE CONNECTORS**

Cable - Plug Assemblies for Round Cable (order 1 part each per cable
end)

Sub- assembly Part \# 3-520424-3 **"C" key**

Sub- assembly Part \# 5-520424-3 **"E" key**

Top Shield Part \# 520464-1

Bottom Shield Part \# 520465-1

Ferrule Part \# 520437-1

Boot Part \# 520853-1

**Trigger System Interface - DONE, BUSY, ERROR cable**

\- The proposal is to use the same differential line drivers, National's
LVDS DS90C032 and DS90C32 as we are using for the clock fanout.

\- The same PCB board mount and cable connectors will be used, with the
exception that these will have **"A"** key coding. This is being done to
prevent someone from mixing the TSI return cables with the clock fanout
cables.

**Board Mount Connectors:**

AMP Shielded Data Link Connectors, 8 Conductor, Side Entry PCB Ground

**Part \# 1-520459-3** **"A"** Key

Cable - Plug Assemblies for Round Cable (order 1 part each per cable
end)

Sub- assembly Part \# 1-520424-3 "A" Key

Top Shield Part \# 520464-1

Bottom Shield Part \# 520465-1

Ferrule Part \# 520437-1

Boot Part \# 520853-1

**PINOUT**

**[Pin]{.underline}** **[Signal]{.underline}**

1 DONE

2 DONE\*

3 ERROR

4 ERROR\*

5 WAIT

6 WAIT\*

7 L1_DONE (This signal is unique to SVX)

8 L1_DONE\*

**Other Useful Part Numbers**

**Hand Tools required for Cable assembly**

Connector Hand Tool Frame Part \# 58194-1

Die Sets for Connectors Part \# 58195-3

Ferrule Hand Tool Frame Part \# 69710-1

Die Sets for Ferrules Part \# 1-58166-2

**Cable**

Teststand use:

Category 5, PVC jacketed Cables/overall Bedfoil Shield, 4 Pair Part \#
1633A

Available Now

Category 5, Plenum-Paired Cables/overall Bedfoil Shield, 4 Pair Part \#
1646A

Available 1/97

(Beldon Wire and Cable Catalog)