Nortel Passport 15000, Установка и обслуживание оборудования, Страница: 599 / 874

Chapter 17 Hardware procedures 599
Passport 15000, 20000 Hardware Installation, Maintenance, and Upgrade 5.2S2
Installing EMI filters on the alarm/BITS module
Install EMI filters on the timing connectors of a Passport 15000 alarm/BITS
module with the PEC NTHR12 or NTHR13 to shield the emission of
electromagnetic interference (EMI).
Prerequisites
• You must be familiar with “Safety considerations and best practices”
(page 53).
• You need 2 inline EMI filters per alarm/BITS module each with part
number A066557. Some alarm/BITS modules have factory-installed
inline EMI filters.
• The J3 and J4 timing connectors on newer versions of the Passport 15000
alarm/BITS modules NTHR12 and NTHR13 have factory-installed
inline EMI filters. If your Passport 15000 alarm/BITS module requires
these filters, do the following procedure. (This does not apply to any
Passport 20000 alarm/BITS modules.) Contact your Nortel Networks
service representative to obtain the required parts.
Procedure steps
1 Examine the figure “An EMI filter on an alarm/BITS connector of a
Passport 15000” (page 600) to see how the EMI filters are to be fitted to
the alarm/BITS module connector.
2 Inject Loctite RD112D06 into the threaded standoffs on the J3 and J4
connectors.
3 Install an EMI filter onto each of the J3 and J4 connectors.
4 Install 2 Jack screws P0991106 to secure each EMI filter to the J3 and J4
connectors.
When you are connecting timing cables to J3 and J4, the screws of the
timing cable D-sub connectors are fastened into the threaded tops of the
Jack screws.