5700MSC-IP
IP Network Grand Master Clock & Video Master Clock System
Page - 62 Revision 0.2
CAUTION - TO REDUCE THE RISK OF ELECTRIC SHOCK, GROUNDING OF
THE GROUND PIN OF THE MAINS PLUG MUST BE MAINTAINED
The EMI line filters in the 5700MSC-IP use the chassis ground as part of the circuit.
This generates a small amount of AC leakage current to ground. In order to reduce
risk of electric shock, the unit MUST be grounded properly through the ground
connections on the AC power supply inlets.
4.1.13. M4 Grounding Stud
The M4 grounding stud is used to provide a ground point to the 5700MSC-IP chassis. It is located
under the REF IN LOOP connectors. It can be used for protective earthing in installations that require
it. An M4 or #8 ring terminal can be used with the provided M4 nut and lock washer.
4.2. MOUNTING AND COOLING
The 5700MSC-IP is equipped with rack mounting ears and fits into a standard 19 inch by 1 ¾ inch
(483 mm x 45 mm) rack space. An optional rear support kit is available for rear mounting in a rack.
The main board and power supplies are forced-air cooled by two fans in each power supply (or fan
module). Both power supply slots must be occupied by a power supply or fan module at all times to
ensure proper operating temperatures inside the unit. The air is drawn in through perforations along
the edges of the front panel and exhausted out the sides of the unit. Ensure that the exhaust holes
along the side of the unit are not blocked by rack supports or cabling otherwise the unit may overheat.
A system fault is activated when the temperature inside the unit exceeds operating limits.
4.3. CONNECTING THE GENERAL PURPOSE INPUTS AND OUTPUTS
The 15-pin female GPIO connector on the 5700MSC-IP+AUX has 2 general purpose inputs and 2
general purpose outputs. The GPI inputs are active low. This means that if an input is floating (not
connected) then it will not be activated. The GPIs can be activated by connecting the GPI input pin to
Ground using a button, switch, relay or an open collector transistor. The GPIs can be configured to
send out SNMP traps on activation.
The GPO outputs are internally pulled up to +5 volts DC. When a GPO activates, the GPO pin is
pulled to ground. Care must be taken to limit the sink current to less than 50mA or damage to the GPO
will result. The functions of the general purpose outputs are set using the GPO 1 Mode and GPO 2
Mode menu items on the GENERAL Setup menu. Note that in event of power being removed from the
5700MSC-IP, the GPOs will appear to be a 20K sink to ground.
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