Cisco ONS 15200 - Manual (Page 27)

C H A P T E R
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Cisco ONS 15200 Product Description
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Product Hardware
This chapter describes the Cisco ONS 15200 mechanical components. It also provides electrical,
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 SCU, or a combination of the two. ONS 15200
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 ONS 15200 system on one or several
channels. Each channel occupies a wavelength, and some ONS 15200 system configurations reuse a
wavelength. As shown in
Figure 3-1 , several channels of information, each occupying a wavelength,
enter the node from the DWDM layer. Each channel can enter the ONS 15252 MCU from the A side, the
B side, or the A side and B side.
The ONS 15252 MCU communicates with the other nodes in the ONS 15200 system on one or more
wavelengths. Information originates at the ONS 15252 MCU Client Layer 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 carried on a wavelength intended for another ONS
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 channel not dropped to the
ONS 15252 MCU.