Checkpoint Systems Inc. EVOLVES10 Manual De Usuario
Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342D)
13
Design Considerations
Good engineering practices must be adhered to when designing a printed circuit board (PCB) containing the
SocketModem module. Suppression of noise is essential to the proper operation and performance of the modem
itself and for surrounding equipment.
SocketModem module. Suppression of noise is essential to the proper operation and performance of the modem
itself and for surrounding equipment.
Two aspects of noise in an OEM board design containing the SocketModem must be considered: on-board/off-board
generated noise that can affect digital signal processing. Both on-board and off-board generated noise that is coupled
on-board can affect interface signal levels and quality. Of particular concern is noise in frequency ranges affecting
modem performance.
generated noise that can affect digital signal processing. Both on-board and off-board generated noise that is coupled
on-board can affect interface signal levels and quality. Of particular concern is noise in frequency ranges affecting
modem performance.
On-board generated electromagnetic interference (EMI) noise that can be radiated or conducted off-board is a
separate, but equally important, concern. This type of noise can affect the operation of surrounding equipment. Most
local government agencies have stringent certification requirements that must be met for use in specific
environments.
separate, but equally important, concern. This type of noise can affect the operation of surrounding equipment. Most
local government agencies have stringent certification requirements that must be met for use in specific
environments.
Proper PC board layout (component placement, signal routing, trace thickness and geometry, etc.) component
selection (composition, value, and tolerance), interface connections, and shielding are required for the board design
to achieve desired modem performance and to attain EMI certification.
selection (composition, value, and tolerance), interface connections, and shielding are required for the board design
to achieve desired modem performance and to attain EMI certification.
The aspects of proper engineering practices are beyond the scope of this designer guide. The designer should
consult noise suppression techniques described in technical publications and journals, electronics and electrical
engineering text books, and component supplier application notes.
consult noise suppression techniques described in technical publications and journals, electronics and electrical
engineering text books, and component supplier application notes.
PC Board Layout Guidelines
In a 4-layer design, provide adequate ground plane covering the entire board. In 4-layer designs, power and
ground are typically on the inner layers. All power and ground traces should be 0.05 inches wide.
ground are typically on the inner layers. All power and ground traces should be 0.05 inches wide.
The recommended hole size for the SocketModem pins is 0.036 in. +/-0.003 in. in diameter. Spacers can be
used to hold the SocketModem vertically in place during the wave solder process. A spacer should be placed on
pin 32 and pin 64 of the SocketModem. A suggested part number for the spacer is BIVAR 938-0.130 for P1
(0.310in) option SocketModems. The spacers can be left on permanently and will not effect operation.
used to hold the SocketModem vertically in place during the wave solder process. A spacer should be placed on
pin 32 and pin 64 of the SocketModem. A suggested part number for the spacer is BIVAR 938-0.130 for P1
(0.310in) option SocketModems. The spacers can be left on permanently and will not effect operation.
All creepages and clearances for the SocketModem have been designed to meet requirements of safety
standards EN60950. The requirements are based on a working voltage of 250V. When the recommended DAA
circuit interface is implemented in a third party design all creepage and clearance requirements must be strictly
adhered to. The third party safety design must be evaluated by the appropriate national agency per the required
specification.
standards EN60950. The requirements are based on a working voltage of 250V. When the recommended DAA
circuit interface is implemented in a third party design all creepage and clearance requirements must be strictly
adhered to. The third party safety design must be evaluated by the appropriate national agency per the required
specification.
User accessible areas: Based on where the third party design is to be marketed, sold, or used, it may be
necessary to provide an insulating cover over all TNV exposed areas. Consult with the recognized safety agency
to determine the requirements.
necessary to provide an insulating cover over all TNV exposed areas. Consult with the recognized safety agency
to determine the requirements.
Note:
Even if the recommended design considerations are followed, there are no guarantees that a particular
system will comply with all the necessary regulatory requirements. It is imperative that specific designs be
completely evaluated by a qualified/recognized agency.
completely evaluated by a qualified/recognized agency.