Internal Odu Surge Suppressor - Alcatel-Lucent 9500 MXC User Manual

Chapter 2. Outdoor Installations

Internal ODU Surge Suppressor

Vol. III-2-24
• A surge suppressor should be installed at building entry to provide added
protection to the indoor equipment, including that of other vendors. But where
required by the site owner or by local regulations, it must be installed.
Currently, external surge suppressors are installed at the ODU and building entry,
but an internal matrix-type suppressor will be phased into production during 3rd
quarter 2007 to become standard, over time, on all hp series ODUs (ODU
300hp), meaning an external suppressor should only be required at building
entry.
Internal suppressors will not be included in the ep series ODUs (ODU 300ep).
For ODUs fitted with an internal suppressor, an additional external ODU
suppressor may still be required to comply with local installation practices in
regions that experience severe lightning strikes.
For external suppressor installations the supplied suppressor is an in-line matrix
type. It has a dc-blocked RF path with multiple protection stages in the parallel
dc path. These suppressors are designed to withstand repeated strikes and in the
event they do fail, to hard-fail so as not to cause un-certain or intermittent
operation.
Two versions are available:
• Type BGXZ-60NFNM-AS
• Type MHT250-N48
They have the same physical dimensions and are interchangeable.
The recommended installation has one suppressor installed at building entry and
one at the ODU.
Refer to:
• Internal ODU Surge Suppressor
• Lightning Surge Suppressor Kit on page 2-25
• Suppressor Installation at Building Entry on page 2-27
• Suppressor Installation at the ODU on page 2-29
ODUs fitted with an internal suppressor must be grounded using the ODU
Grounding Procedure on page 2-14. No other special installation procedure is
required.
Key benefits of the internal ODU suppressor include:
Alcatel-Lucent