Figure 14-9 Oscm Block Diagram - Cisco ONS 15454 DWDM Installation And Operation Manual

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14.4.1 OSCM Card

Figure 14-9 OSCM Block Diagram

The OSCM is used in amplified nodes that include the OPT-BST booster amplifier. The OPT-BST

includes the required OSC wavelength combiner and separator component. The OSCM cannot be used

in nodes where you use OC-N cards, electrical cards, or cross-connect cards. The OSCM uses Slots 8

and 10, which are also cross-connect card slots.

The OSCM supports the following features:

The OC-3 section data communications channel (SDCC) overhead bytes are used for network

communications. An optical transceiver terminates the OC-3, then it is regenerated and converted into

an electrical signal. The SDCC bytes are forwarded to the active and standby TCC2 cards for processing

via the system communication link (SCL) bus on the backplane. Orderwire bytes (E1, E2, F1) are also

forwarded via the SCL bus to the TCC2 for forwarding to the AIC-I card.

The payload portion of the OC-3 is used to carry the fast Ethernet UDC. The frame is sent to a

packet-over-SONET (POS) processing block that extracts the Ethernet packets and makes them

available at the RJ-45 connector.

The OSCM, which resides in the cross-connect slots and follows the ONS 15454 backplane architecture,

distributes the reference clock information by removing it from the incoming OC-3 signal and then

sending it to the DWDM cards. The DWDM cards then forward the clock information to the active and

standby TCC2 cards.

Cisco ONS 15454 DWDM Installation and Operations Guide, R4.7

OC-3 formatted OSC

Supervisory data channel (SDC) forwarded to the TCC2 cards for processing

Distribution of the synchronous clock to all nodes in the ring

100BaseT far-end (FE) user data channel (UDC)

Monitoring functions such as orderwire support and optical safety

Line Ref clock

Card Reference

Power supply

Input filters

December 2004