# Overview of MuTr FEE System

## FEE Connections:

## ![](media/image1.wmf) 

## Channel and Board Counts---South Arm

  -------------- -------- --------------- -------- --------------- -------- ---------------- ---------
                                                                                             

                 **1S**                   **2S**                   **3S**                    **South
                                                                                             Total, 2
                                                                                             gaps in
                                                                                             St 3**

  cathode strips 96       strips per oct  160      strips per oct  256      strips per oct   
                          per plane                per plane                per plane        

                 4608     strips-1S       7680     strips-2S       8192     strips-3S-2gp    20480

                                                                                             

  cables, 16     6        cables per oct  10       cables per oct  16       cables per oct   
  strips read             per plane                per plane                per plane        
  per cable                                                                                  

                 288      cables-1S       480      cables-2S       512      cables-3S-2gp    1280

                                                                                             

  CROC           10       CROC/oct        16       CROC/oct        16       CROC/oct-2gp     

                 20       CROC/qu                                                            

                 80       CROC-1S         128      CROC-2S         128      CROC-3S-2gp      336

                                                                                             

  chassis        5        per quad        4        per oct         6        per oct-2gp      

                                                                                             

                 20       chass-1S        32       chass-2S        48       chass-3S-2gp     100

                                                                                             

  backplane      5        per quad        4        per oct         6        per oct-2gp      

                                                                                             

                 20       chass-1S        32       chass-2S        48       chass-3S-2gp     100

                                                                                             

  Controller     10       per quad        8        per oct         8        per oct-2gp      

                                                                                             

                 40       Controller-1S   64       Controller-2S   64       Xtrollr-3S-2gp   168

                                                                                             

  Glink2Clink    2        G2C module per  2        G2C module per  2        G2C mod/oct      40
  module                  quad                     oct                                       

  (fans out 15) (8                       (16                      (16                       
                 total)                   tot.)                    tot.)                     

  T+FC           2        per quad        2        per oct         2        per oct          40

                                                                                             

  GTM fanout     1 mod.                   2 mod.                   2 mod.                    5 modules

  (8 chan./mod.)                                                                             

  ARCNet fibers  3        per station     4        per station     5        per station      12

                                                                                             

  ARCNet hub                                                                                 1

                                                                                             

  Clink2Glink    1        C2G module per  1        C2G module per  1        C2G mod/oct, 2   20
  module                  quad                     oct                      or 3 gp          

  (5 tx/rx                                                                                   
  pairs/board)                                                                               

  LVDC           1        per quad        1        per oct         1        per oct          20

  distn. Cards                                                                               
  -------------- -------- --------------- -------- --------------- -------- ---------------- ---------

## Channel and Board Counts---North Arm

+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         | **1 |         | **2 |         | **   |         | *      |
|         | N** |         | N** |         | 3N** |         | *North |
|         |     |         |     |         |      |         | Total, |
|         |     |         |     |         |      |         | 2 gaps |
|         |     |         |     |         |      |         | in**   |
|         |     |         |     |         |      |         |        |
|         |     |         |     |         |      |         | **St   |
|         |     |         |     |         |      |         | 3**    |
+---------+-----+---------+-----+---------+------+---------+--------+
| cathode | 96  | strips  | 192 | strips  | 320  | strips  |        |
| strips  |     | per oct |     | per oct |      | per oct |        |
|         |     | per     |     | per     |      | per     |        |
|         |     | plane   |     | plane   |      | plane   |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         | 4   | st      | 9   | st      | 1    | strips  | 24064  |
|         | 608 | rips-1N | 216 | rips-2N | 0240 | -3N-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| cables, | 6   | cables  | 12  | cables  | 20   | cables  |        |
| 16      |     | per oct |     | per oct |      | per oct |        |
| strips  |     | per     |     | per     |      | per     |        |
| read    |     | plane   |     | plane   |      | plane   |        |
| per     |     |         |     |         |      |         |        |
| cable   |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         | 288 | ca      | 576 | ca      | 640  | cables  | 1504   |
|         |     | bles-1N |     | bles-2N |      | -3N-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| CROC    | 10  | C       | 18  | C       | 20   | CROC/   |        |
|         |     | ROC/oct |     | ROC/oct |      | oct-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         | 20  | CROC/qu |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         | 80  | CROC-1N | 144 | CROC-2N | 160  | CROC    | 384    |
|         |     |         |     |         |      | -3N-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| chassis | 5   | per     | 5   | per oct | 7    | per     |        |
|         |     | quad    |     |         |      | oct-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         | 20  | c       | 40  | c       | 56   | chass   | 116    |
|         |     | hass-1N |     | hass-2N |      | -3N-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| ba      | 5   | per     | 5   | per oct | 7    | per     |        |
| ckplane |     | quad    |     |         |      | oct-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         | 20  | c       | 40  | c       | 56   | chass   | 116    |
|         |     | hass-1N |     | hass-2N |      | -3N-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| Con     | 10  | per     | 9   | per oct | 10   | per     |        |
| troller |     | quad    |     |         |      | oct-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         | 40  | Contro  | 72  | Contro  | 80   | Xtrollr | 192    |
|         |     | ller-1N |     | ller-2N |      | -3N-2gp |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| Glin    | 2   | G2C     | 2   | G2C     | 2    | G2C     | 40     |
| k2Clink |     | module  |     | module  |      | mod/oct |        |
| module  |     | per     |     | per oct |      |         |        |
|         |     | quad    |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| (fans   | (8  |         | (16 |         | (16  |         |        |
| out     | tot |         | to  |         | t    |         |        |
| 15)    | al) |         | t.) |         | ot.) |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| T+FC    | 2   | per     | 2   | per oct | 2    | per oct | 40     |
|         |     | quad    |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| GTM     | 1   |         | 2   |         | 2    |         | 5      |
| fanout  | m   |         | m   |         | mod. |         | m      |
|         | od. |         | od. |         |      |         | odules |
+---------+-----+---------+-----+---------+------+---------+--------+
| (8      |     |         |     |         |      |         |        |
| chan    |     |         |     |         |      |         |        |
| ./mod.) |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| ARCNet  | 2   | per     | 4   | per     | 4    | per     | 10     |
| fibers  |     | station |     | station |      | station |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| ARCNet  |     |         |     |         |      |         | 1      |
| hub     |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
|         |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| Clin    | 1   | C2G     | 1   | C2G     | 2    | C2G     | 28     |
| k2Glink |     | module  |     | module  |      | m       |        |
| module  |     | per     |     | per oct |      | od/oct, |        |
|         |     | quad    |     |         |      | 2 or 3  |        |
|         |     |         |     |         |      | gp      |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| (5      | 4   |         | 8   |         | 16   |         |        |
| tx/rx   | to  |         | to  |         | t    |         |        |
| pairs   | tal |         | tal |         | otal |         |        |
| /board) |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| LVDC    | 1   | per     | 1   | per oct | 1    | per oct | 20     |
|         |     | quad    |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+
| distn.  |     |         |     |         |      |         |        |
| Cards   |     |         |     |         |      |         |        |
+---------+-----+---------+-----+---------+------+---------+--------+

### 

### Chassis

Each chassis contains up to 4 CROCs, 2 Controller boards, and one
backplane. This is the equivalent of 2 FEMs, with 1 FEM being comprised
of 1 Controller board and 2 CROC boards. Half-chassis contain 2 CROCs, 1
Controller board and one backplane.

South arm:

-   5 chassis / quadrant at station 1

-   4 chassis / octant at station 2

-   6 chassis / octant at station 3

North arm:

-   5 chassis / quadrant at station 1

-   5 chassis / octant at station 2

-   7 chassis / octant at station 3

### Glink2Clink

Each Glink2Clink board will fan 1 T+FC optical fiber signal into 5
copper signals. One T+FC signal is required for each Controller Board.
For ease of installation, have an integral number of Glink2Clink boards
per quadrant or octant (North is listed in parentheses):

-   Station 1: 10 controller boards/quadrant  2 Glink2Clink
    board/quadrant

-   Station 2: 8(9) controller boards/octant  2 Glink2Clink
    board/octant

-   Station 3: 8(10) controller boards/octant  2 Glink2Clink
    boards/octant

Total = 8 + 16 + 16 = 40 Glink2Clink boards.

The locations of these boards is in Glink/Clink crates mounted on the
back of the magnet and on the ledges of the magnet on the South Arm. One
Glink/Clink crate has been determined to hold 4 Glink2Clink cards and 2
Clink2Glink cards. This will service 1 station 2 plus 1 station 3 octant
or half of station 1.

### T+FC

Timing and Fast Control signal goes to the Glink2Clink boards, which fan
the signal out to the controller boards---one signal per controller
board. This signal will come from the GTM fanout modules which ONCS will
provide

### GTM fanout

We need up to 200 copies of the T+FC signal for our controller boards.
The Glink2Clink fanout boards reduce this to 40 according to the above
calculation under Glink2Clink. According to ONCS, they can fanout up to
64 signals and this is done with modules which have 8 channels per
module (do they daisy-chain between modules?), so one fanout from them
will be enough for the South arm, 5 modules in the fanout (6 if they
daisy-chain between modules).

### ARCNet fibers, ARCNet hubs

We require one ARCNet fiber for each controller board, or up to 200
fibers. ONCS says that we can daisy-chain up to 16 fibers together. This
means that we need the following numbers of fibers for the three
stations:

-   Station 1: 40 controller boards/16 = 3 fibers

-   Station 2: 64(72) controller boards/16 = 4 fibers

-   Station 3: 64(80) controller boards (depending on the number of
    chassis populated)/16 = 4 fibers

Total = 3 + 4 + 4 fibers = 11 fibers. ONCS says that one ARCNet hub can
provide up to 14 fibers which will be enough to cover the three South
arm stations, so we need one ARCNet hub for the South Arm.

### Clink2Glink

Each Clink2Glink board contains 5 pairs of receiver/transmitters to turn
cathode data to optical fiber for the DCMs. For "Day 1" we will
daisy-chain 2 controller boards together and send the data from the pair
to one DCM, which means that 1 Clink2Glink board can service 10
Controller Boards. For ease of installation, have integral number of
Clink2Glink boards per quadrant or octant:

-   Station 1: 5 chassis/quadrant  1 Clink2Glink board/quadrant

-   Station 2: 4(5) chassis/octant  1 Clink2Glink board/octant

-   Station 3: 6(7) chassis/octant  1 Clink2Glink boards/octant for
    South, 2 boards/octant for North

South Total = 4 + 8 + 8 = 20 Clink2Glink boards. These boards will be in
Glink/Clink crates which hold 4 Glink2Clink boards and 2 Clink2Glink
boards. Therefore, 1 crate will service 1 station 2 octant plus 1
station 3 octant, or 1/2 of station 1.

North Total = 4 + 24 = 28 Clink2Glink boards if 3 boards are used for
each St. 2/3 octant pair.

### LVDC

The low voltage power supplies for the Controller Cards, CROCs,
Glink/Clink Cards will be located on the platform. Distribution cards
will also be located on the platform racks, and have the capability of
fanning an input voltage out to 10 output voltages. One LVDC input is
required for each Controller Board, which distributes the power also to
two CROCs. This means that the number of LVDC channels required for the
FEMs is:

South:

-   Station 1: 40 controller boards, 40/10 = 4 low voltage distribution
    cards

-   Station 2: 64 controller boards, 64/10 = 8 low voltage distribution
    cards (8 to give 1 per octant)

-   Station 3: 64 controller boards, = 8 low voltage distribution cards

North:

-   Station 1: 40 controller boards, 40/10 = 4 low voltage distribution
    cards

-   Station 2: 72 controller boards, 72/10 = 8 low voltage distribution
    cards (8 to give 1 per octant)

-   Station 3: 80 controller boards, = 8 low voltage distribution cards

The above total is 20 low-voltage distribution cards.

The Glink/Clink crates will require 5 power supply lines per crate.
There will be 8 crates to service Stations 2 and 3 and 2 crates for
Station 1. This means that the Glink/Clink cards will require (5
lines)\*(10 crates)/(10 lines per distribution board) = 5 distribution
boards.

The North arm Glink/Clink crates will require 3 power supply lines per
station 2 crate, 4 power supply lines for station 3 crates, and 10 lines
for the 2 station 1 crates. This gives a total of 7\*8 + 10 = 66 lines
required for the North arm. In order to keep station 2 and 3 separated,
this should come from 1 distribution card for station 1, 3 distribution
boards for station 2 and 4 distribution boards for station 3(?).

The number of channels required for the alignment system is 56/10 = 6
distribution cards.

**The total number of LV distribution cards required for the SOUTH ARM
is therefore 20 + 5 + 6 = 31 cards.**

**The total number of LV distribution cards required for the NORTH ARM
is therefore 20 + 8 + 6 = 34 cards.**

## Rack Space and Power Requirements

### Rack Specs

Default ¾ rack size is 1400 x 600 x 1000 mm (height x width x depth). We
can assume that out of the 1400mm height, 48" (1219mm) of rail space
will actually be available. Each rack will contain one Power Bucket The
Power Bucket is the size of a NIM bin: 273mm deep x 220 mm (8.75") high.
This leaves 39.25" of vertical spaced available in each rack. For each
crate in a rack, you must also have one fan unit and one radiator. Each
of these are 1U size (1.75").

### High Voltage Power Supplies

There will be 4 HV inputs per octant-plane at Stations 2 and 3 and 8 HV
inputs per octant-plane at Station 1, or 4\*(8\*3 + 8\*2) + 8\*8\*3 =
352 channels of HV for the South arm. Each HV card can provide 24
channels of HV we need 15 cards of HV. This apparently fits into 1 rack
which is at least 100 cm deep and is 14" high.

### ARCNet Hub

This requires 6" of vertical space and is ½ crate in width.

### T+FC Fanout

One 6U card contains 8 channels. We need 40 copies which means 5 (6 if
daisy-chaining between fanouts) cards would be sufficient. This easily
fits in one 6U crate which is 10.5" high. These cards will share the VME
crate that is used for the calibration system since the calibration
system does not require all the slots in the crate.

### LVDC Power requirements and Space

**FEMS**:

Recent results from the FEM prototype indicate that 3 amps is sufficient
per FEM, \~200 FEMs  600 amps required. Voltage required is 5 volts,
but \~7.5 volts needed when you take into account IR drops and LDO input
of 5.5 Volts. This means (600 amps)\*(7.5 volts) = 4.5 kW of power for
FEM modules. Using our distribution cards, this should come from 20
channels of LVDC.

#### Glink2Clink

Power estimate from Manny is 5.66 watts per channel on the Glink2Clink
boards. There are 5 channels on a board, giving 28.3 watts per board. We
need 40 boards, giving a total power requirement of 1.13 kW which should
come from 5 channels of power supply if we use our LVDC distribution
cards. 5 volts is required at board, supply should be \~6 volts.

#### Clink2Glink

Power estimate from Manny is 5.47 watts per channel on the Clink2Glink
boards. There are 5 channels on a board, giving 27.4 watts per board. We
need 20 boards, giving a total power requirement of 0.55 kW which should
come from 3 channels of power supply if we use our LVDC distribution
cards. 5 volts is required at board, supply should be \~6 volts.

**North Glink/Clink crates:**

For Station 2, one crate will require one Rx board, one Arcnet board and
2 Tx boards and the power required by these boards is one 6V, \~3.3Amp
line to supply 5V to the Rx board, one 6V line to supply 5V for the
ARCNet and Tx boards, and one 6V line to supply 3.3V. Assume \~3.3amps
per line gives (3.3amps)\*(6volts)\*(3 lines) \~ 60 Watts of power. For
Station 3, 2 Rx boards, 2 Tx boards and 1 ARCNet board are required. The
power lines required would be one 6V line for each of the Rx boards, one
6V line to provide 5V for the Tx boards and one 6V line to provide 3.3V.
This would give a total power requirement of approximately (3.3
amps)\*(6 volts)\*(4 lines) = 80 Watts per Station 3 crate. The total
number of 3.3Amp lines required would be 7\*8 + 2\*5(for station 1) = 66
lines. This would come from 8(?) distribution boards.

#### Alignment Cameras

The cameras draw \~210 mA per camera (per Jiro, Aug. 99). We need 56/10
= 6 channels worth of power to go to our distribution cards, and a total
of \~15 Amps at 12 Volts (0.18 kW).

We need space to hold power supplies for the above, plus LVDC
distribution cards which will be 6U size (10.5"). Power supply size is
6U = 10.5" high, and 537 mm (21.1\") deep.

### LV Distribution Crate

The low-voltage distribution cards will be made to fit into a 6U VME
crate (10.5\" high) and the current design for the board requires a
depth of 36 cm (14.2\"). Two of these crates will be required to provide
power for the FEMs, Glink/Clink crates, and alignment cameras.

### Slow Controls VME Crate

This crate will receive analogue and binary ancillary-systems input. 14"
high (?)

### Alignment System

The CCD cameras of the alignment system will go into a Keithley
switching system which will allow the analysis software to look at one
camera output at a time. This switching module (7001) is a box that is
8.9 cm high x 21.6 cm wide x 37.5 cm deep (3.56\" x 8.5\" x 14.76\")

### Optical Fiber Patch Panel

One ONCS patch panel will hold 144 fibers, and it is 7" high and the
width of a rack. We will need one fiber for each chassis for DCM
connections, or 100 fibers. We need 2 copies (?) of the T+FC signal, and
we need ARCNet connections for the FEMs and for the HV system. Ethernet
connections and connections to the ADAMs in the racks will also be
provided through this patch panel.

### Nitrogen and Water maninfolds

Located on the back of the magnetno rack space required

### Chamber Gas System

This will be located on the back of the magnet, lower western corner.

### Calibration System

One 6U VME crate will be used to hold the calibrations system cards. The
number of cards in this system is\_\_\_ and it will be combined with the
T+FC modules into one 6U crate. A patch panel is also required for the
calibration system. It will be \_\_\_ x \_\_\_ x \_\_\_ in size and will
be put into the same rack as the calibration crate.

## Summary

Table 1 summarizes the rack space required. If High Voltage, ARCNet and
T+FC are put into one crate (requires 1041 mm) with the patch panel in
the back of the crate, 2 LVDC crates and a LVDC distribution card crate
are put in a second rack (1111 mm), and a Slow Controls crate,
calibration crate and the camera switching are put into a third rack
(889 mm), it appears that 3 racks will be sufficient.

![](media/image2.wmf)

The figures below show the expected rack layout for the North Muon Arm:

![](media/image3.png){width="5.6in" height="2.85in"}

The figures below show the expected rack layout for the South Muon Arm:

![](media/image6.png){width="6.2in" height="2.9in"}

![](media/image7.png){width="6.2in" height="2.8in"}