Subrack
From MCEWiki
Template:Hierarchy header Two types of MCE subracks are in production:
- a large (72-HP) subrack containing 5 MDM connectors and four read-out cards.
- a small (48-HP) subrack containing 3 MDM connectors and two read-out cards.
An intermediate sized 60-HP subrack was also prototyped but not produced in large numbers. Functionally it is equivalent to the modern 48-HP subrack.
Components
A fully-kitted subrack contains:
- 1 clock card
- 2 (48-HP subrack) or 4 (72-HP subrack) readout cards (fewer are installed if the extra read-out capacity is not needed)
- 3 bias cards (in some situations one might be removed)
- 1 address card
It also contains the following which are generally not "user-replaceable":
- 1 bus backplane
- 1 instrument backplane
- 3 (48-HP subrack) or 5 (72-HP subrack) MDM filter boxes
- Notes
- before the development of fast bias cards, in each subrack, one bias card was often replaced with a biasing address card (BAC), to allow for fast SQ2 switching. Modern bias cards can now perform fast switching and the BAC option is now obsolete.
- the 72-HP subrack also has space for a power supply (PSA) which is now obsolete and no longer installed. In its place is fitted a Linear Feed Card which simply brings the power lines off the back plane out to front panel connectors. See MCE Power Requirements for current subrack power options.
Dimensions and Weight
- A fully populated 3-MDM (5-MDM) MCE weighs approximately 9.5 kg (13 kg). This does not include the weight of the power supply and power cable.
- Dimensions for a 48-HP MCE: ~ 40cm x 31cm x 34cm (L x W x H)
- Dimensions for a 72-HP MCE: ~ 40cm x 43cm x 34cm (L x W x H)
- Note: We are currently working on reducing the depth of the subracks by ~5cm and this will reduce the weight as well.
Other information
- MCE Power Requirements
- Hardware Interface Block Diagram(PDF) (SC2_ELE_S580_005)
- Subrack Mounting Instructions (DOC) (SC2-MEC-S580-504)
- Hardware Maintenance notes
