Comtech EF Data SDM-9220 - Manual (Page 68)

SDM-9220/9230 Hardware Installation Guide
4-26 Memotec Inc.
4.10 Installing the Ferrites (EMI Filters)
NOTE: Ferrites are not provided with the product package.
Ferrites, or EMI filters, are required in the following circumstances:
• For E&M/PTT connections on all SDM-9220 and SDM-9230 products, in all
countries
• For E1-75 connections on the SDM-9220 DC and SDM-9230 DC only, in all
countries
• For FXO, FXS and ISDN-BRI S/T connections on the SDM-9220 UAC and
SDM-9230 UAC only, in the European Union and Russia only. These ferrites
ensure compliance with standard EN 55024:1998 + A1 + A2.
Table 4-3 provides details on ferrite requirements.
To install a ferrite:
1. Thread the cable from the NetPerformer port through the ferrite opening
2. Wrap the cable around the ferrite the number of times required for the port, referring
to
Table 4-3 . Figure 4-11 shows an example of a single wrap around the ferrite.
NOTE: Wrapping is not required in the case of an E1-75 connection, as the coaxial
cable connected to the RJ48 to BNC adaptor is too bulky to permit it.
Port Type Models affected Where required
Ferrite required
(Steward)
Cable
Wrapping
E&M/PTT All SDM-9220/
9230 models
All countries LFB159079-000 4 times
E1-75 SDM-9220/9230
DC
models
All countries 27A2024-0A2, on
each coaxial cable not required
FXO SDM-9220/9230
UAC
models
EU and Russia
only LFB143064-000 6 times
FXS SDM-9220/9230
UAC
models
EU and Russia
only LFB143064-000 6 times
ISDN-BRI
S/T SDM-9220/9230
UAC
models
EU and Russia
only LFB143064-000 4 times
Table 4-3: SDM-9220/9230 ports requiring a ferrite