3-5
Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 3 Optical Service Channel Cards
3.3 OSCM Card
The OSCM card is used in amplified nodes that include the OPT-BST, OPT-BST-E, or OPT-BST-L
booster amplifier. The OPT-BST, OPT-BST-E, and OPT-BST-L cards include the required OSC
wavelength combiner and separator component. The OSCM cannot be used in nodes where you use
OC-N/STM-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:
• OC-3/STM-1 formatted OSC
• Supervisory data channel (SDC) forwarded to the TCC2/TCC2P cards for processing
• Distribution of the synchronous clock to all nodes in the ring
• 100BaseT far-end (FE) User Channel (UC)
• Monitoring functions such as orderwire support and optical safety
The OC-3/STM-1 section data communications channel (SDCC or RS-DCC) overhead bytes are used
for network communications. An optical transceiver terminates the OC-3/STM-1, then it is regenerated
and converted into an electrical signal. The SDCC or RS-DCC bytes are forwarded to the active and
standby TCC2/TCC2P cards for processing through the system communication link (SCL) bus on the
backplane. Orderwire bytes (E1, E2, F1) are also forwarded via the SCL bus to the TCC2/TCC2P for
forwarding to the AIC-I card.
The payload portion of the OC-3/STM-1 is used to carry the fast Ethernet UC. The frame is sent to a
packet-over-SONET/SDH (POS) processing block that extracts the Ethernet packets and makes them
available at the RJ-45 connector.
The OSCM distributes the reference clock information by removing it from the incoming OC-3/STM-1
signal and then sending it to the DWDM cards. The DWDM cards then forward the clock information to
the active and standby TCC2/TCC2P cards.
To Next Page
Loading...
Need help?
General
