Level 1 (and 2) Trigger Framework Cabling ----------------------------------------- Original: 30-SEP-1998 Revised: 8-OCT-1998 This file describes details of cabling for the Level 1 (and 2 ) Trigger Frameworks. **** Front Cables in the L1 Framework and Scaler/L2 FW Racks **** 1. 2 THE Cards, each with 64 outputs, feeding an adjacent Pass-Through This is the most common front cabling arrangement in the L1 Trigger Framework. Eight, 34-conductor cables with a single female connector on each end are required. The 2 THE Cards are positioned such that the card closest to the Pass-Through feeds the P2-related Pass-Through connectors, and the card furthest from the Pass-Through feeds the P3-related connectors. This tries to equalize the cable-length by trading horizontal vs. vertical displacement. With this arrangement, the cabling required here is as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 2 18" 1 nominal PT MSA_In(63:32) 6 18" 1 maximal all other MSA_In This arrangement is found in the following locations in the L1 Trigger Framework: And-Or Input TRM's 2 sets Physics And-Or Fired AONM's 2 sets Geo Sect FE Bz TRM's 1 set Sp Trig Mask to L2 FIFO TRM's 1 set Individual ST Disable TRM's 2 sets L2 Accept per Sp Trig 1 set L2 Reject per Sp Trig 1 set -------- 10 sets = 80 cables 2. Eight TDM's feeding one Pass-Through The 8 TDM's each provide 16 signals (1 34-conductor cable) from their MSA 15:0 outputs to the Pass-Through. Eight 34-conductor cables with a single female connector on each end are required. Again, the TDM's are positioned to trade horizontal and vertical displacement, to try to equalize cable lengths. The cabling here is as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 1 18" 1 maximal ST 15:0 1 24" 1 minimal * ST 31:15 2 24" 1 nominal ST 63:32 4 24" 1 maximal ST 127:64 * or nominal Note that, unlike the other cabling arrangements, here cables must "cross over" each other. This could be avoided by rearranging the order of the TDM's, but then they would be in a somewhat scrambled order. It is only really an issue with two cables, and there is enough slack in those cables to handle the crossover cleanly. 3. Additional cards on Specific Trigger Fired Bus There are 2 FOM's and an FOM++ on the Specific Trigger output bus which feed NON-adjacent Pass-Through cards. The single FOM++ has 3 intervening cards, while the pair of FOM's have 5 intervening slots. Twelve, 34-conductor cables with a single female connector on each end are required. The cabling is as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 4 24" 1 minimal * FOM++ 8 24" 1 nominal FOM * or nominal 4. Exp Group Enable, EG FE Bz Disable, Global Disable signals The 2 Exposure Group Partial Enable AONM's, plus 1 Exposure Group Front-End Busy TRM, plus the Global Disable TRM, all must feed: 1. The 8 TDM's 2. The Exposure Group Per-Bunch Scalers Also, the 2 EG AONM's must additionally feed 8 (12? 16?) Gated Scalers for monitoring and diagnostic purposes. All of this is done using a single Pass-Through, located directly to the left of the 8 TDM's. The following Pass-Through connectors are used: MSA Usage --- ----- 15:0 31:16 Exp Group Partial Enable to EG PBS's 47:32 Exp Group type signals to Gated scalers 63:48 Exp Group Partial Enable to TDM's 79:64 95:80 EG FE Bz, Glob Disable to EG PBS's 111:96 127:112 EG FE Bz, Glob Disable to TDM's Five, 34-conductor cables are required for this purpose. One has single female connectors on each end, while the other four have a single female connector on ONE end, but the other end is split, with two (34-pin) female connectors on each "half", allowing two cards to drive a single cable. The cabling is as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 4 18" 3 nominal split end 1 18" 3 nominal standard end 5. All Common Signals to the SCL Hub End More on this to come... **** Rear Cables in the L1 Framework Rack **** 1. Physics Partial And-Or Fired to TDM's The 2 Physics And-Or Fired Pass-Throughs each provide 128 signals (16 to each of the 8 TDM's). A total of 16, 34-conductor cables are required. These cables have a single 34-pin female connector on the Pass-Through end, and split into 2, 16-conductor female connectors (one goes to P2 and the other to P3, both in the same slot). These cables need to do considerable criss-crossing, as both Pass-Throughs provide one cable for each of the 8 TDM's. The cables are all identical, and are as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 16 18" 2 nominal split end 2. Exp Group Enable, EG FE Bz Disable, Global Disable signals Recall that (separate copies of) these signals feed 2 destinations (the TDM's and the PBS's, see above). They enter the back of the rack via a Pass-Through directly adjacent to the TDM chain. NO Rear Paddleboard is used on this Pass-Through. Two cables are required to provide these signals to the TDM chain. In principle these cables are short and simple. In practice, since no Rear Paddleboard is used, and there are issues of order/polarity swapping (see CABLE_NOTES.TXT), these cables are made from individual twisted-pair material made into a harness. This is also useful for the Global Disable signals, allowing us to mix in the Skip Next Tick signal (from the FOM++) as a Global Disable. Two additional cables are required to provide these signals to the PBS chain. These are just copies of the above cables, and two 34-conductor twist'n'flat cable (with a MALE extension-type end connector on one end) are used to provide the "long haul" to the Scaler Rack. Up to 16 additional Exposure Group type signals are also available for general scaling, but no destination has been defined for them yet so no cable is defined either. The cables are therefore as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 4 individual twisted-pair material 2 18" 1 nominal 1 male end req'd 3. L2 ST Fired Mask to L2 Framework These cables go from the L2 ST Fired Mask Pass-Through to two separate pairs (4 cards total). Eight cables are required, each of which must visit all 4 AONM's. This is problematic, as the 4 AONM's are not all adjacent, so we can't use just a single "stack" of Rear Paddleboards. Once each cable needs to drop off to 2 (or 4) Rear Paddleboards, a lot of criss-crossing is required. Each cable must have 1 34-conductor female connector on one end, and 2 (4?) 34-conductor female connectors on 2 (4) different flat sections near the other end. They are identical, and are as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 8 24" 3 total nominal 4. L1 Accepts per Geo Sect to SCL Hub End These cables go from the L1 Accept Pass-Through to the SCL Hub End. Each cable carries 16 L1 Accepts, and so must be split to visit 2 cards at the SCL Hub End. The cables are as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 8 18" 2 nominal split end 5. L1 Front-End Busy from SCL Hub End These cables come from the SCL Hub End, and go to the L1 Front-End Busy TRM's. Each cable carries 16 Front-End Busies, and so must be split to visit 2 cards at the SCL Hub End. The cables are as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 8 18" 3 nominal split end 6. Individual Disables from Pass-Throughs to TDM's These cables are identical to the Physics AO Fired-to-TDM cables. Qty Type # sections cut style note --- ---- ---------- --------- ---- 16 18" 2 nominal split end 7. L2 Accept and Reject per Geo Sect from L2 FW to SCL Hub End These cables are identical (except for possibly length) to the L1 Accepts to SCL Hub End cables. The cables are as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 16 24" 4 nominal split end 8. L2 Front-End Busy from SCL Hub End These cables come from the SCL Hub End, and go to the L2 Front-End Busy TRM's (???). Each cable carries 16 Front-End Busies, and so must be split to visit 2 cards at the SCL Hub End. The cables are as follows: Qty Type # sections cut style note --- ---- ---------- --------- ---- 8 24" 4 nominal split end Calculation of Needed Supplies: ------------------------------- To implement the cabling described here (which isn't all of the cabling required for Run II, but is a large fraction of it), we need to buy the following material: 34-conductor cable - 18" sections: ~ 500 feet - 24" sections: minimum order is 20 spools 34-pin mass-termination headers - female: ~ 300 - male: ~ 2 16-pin mass-termination headers - female: ~ 150 34-pin PCB-mount connectors - 90-deg male sold tail: ~ 60 (minus stock on hand) - 90-deg male ww tail: ~ 32 AMP crimp-connect material - 32 or 34-conductor headers: ~ 10 - 2-conductor headers: ? - female receptacles: ~ 400 + - twisted-pair cable: ~ 1 spool