CHAPTER
3-1
Cisco ONS 15200 Product Description
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Product Hardware
This chapter describes the Cisco ONS 15200 mechanical com ponents. I t a lso p rov ides e lec tri cal,
electromagnetic, and safety information about the ONS 15200.

3.1 Modularity and Ancillary Equipment

Equipment in the ONS 15200 system is modular in design. Each system function is carried out by
modules located in either an ONS 15252 MCU or an ONS 15201 SCU. Sites in the ONS 15200 system
consist of either an ONS 15252 MCU, an ONS 15201 SC U, o r a co mb inati on of the two. O NS 1520 0
site configurations may also include a power distribution panel (PDP).

3.1.1 ONS 15252 MCU

The ONS 15252 MCU communicates with the other nodes in the ON S 15 200 syste m on one or seve ral
channels. Each channel occupies a wavelength, and som e ON S 15 200 sy stem c onfi gurat ion s re use a
wavelength. As shown in Figure 3-1, several channels of information, each o ccupyi ng a wavel ength ,
enter the node from the DWDM layer. Each channel can enter the ONS 15252 MCU from the A s ide, the
B side, or the A side and B side.
The ONS 15252 MCU communicates with the other nodes in the ON S 1 5200 sy st em o n o ne or m or e
wavelengths. Information originates at the ONS 15252 MCU Client La yer Interface Port (CLIP) module.
For optically-protected channels, the Network Adaptation module (NAM) splits the information and
transmits it in opposite directions through two Hub Filter Modules (HFMs) and two Line Modules (LMs)
at a specific wavelength.
For unprotected channels, the NAM transmits the information to either an A-side HFM or a B-side HFM
and then through the associated LM. Information c ar rie d o n a wa vel engt h inten de d f or anot her O NS
15200 site passes through the ONS 15252 MCU without interference except for the insertion loss of the
ONS 15252 MCU, if a BM or a CMX is used. If the ONS 15252 MCU is equipped with Termination
modules (TMs) instead of a BM, the TMs block any wavelength or cha nnel n ot d roppe d to t he
ONS 15252 MCU.