Comparison between OSC and ESC functions

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1. OSC function:
Supported boards: HSC1, SC1, SC2, ST2, and DAS1
Transmission channels: D1–D3, D4–D12, OSC_18, and FE_DCN
Maximum distance: 200 km (The specific distance is related to the board type.)
Stability: high
Costs: high (because extra OSC channels need to be used.)
Maintainability: strong
Stability of the ECC topology: fixed and stable
Restrictions: OSC units are required for all NEs.
2. ESC function:
Supported boards: OTU boards, tributary boards, and line boards
Transmission channels: GCC0, GCC0_18, GCC12_9, GCC12_18, GCC1_24, GCCM_24, RES_ODU, and pilot-tone DCC
Maximum distance: service-related and no restriction
Stability: medium
Costs: low
Maintainability: poor
Stability of the ECC topology: low, varying with service changes
Restrictions: OLA sites cannot be managed.
3. GCC0_18 and GCC1_24 channels are supported only by the following boards: TN15LSXL, TN55NS3, TN54NS4, TN57NS4, TN11LTX, TN12LTX, TN15LTX, TN12LSC, TN14LSC, TN56NS4, TN56NS3, TN54HUNS3, TN13LSC, and TN15LSC.
4. D4–D12, GCC1_24, RES_ODU, and GCCM_24 channels are used by default to transmit information related to ASON services. On the NMS, the channels can be used to transmit ASON services or function as the DCN channels.

Other related questions:
Method used to handle frequent switching between OSC and ESC during deployment commissioning
During deployment commissioning, the optical power of the OTU or line board is not commissioned, leading to unstable ECC links and frequent switching between the OSC and ESC channels. The details are as follows: NEs are occasionally unreachable by the NMS, and alarms indicating excessively high or low optical power are reported on related OTU boards or the WDM side of line boards. ECC links are frequently switched between different channels. The handling method is as follows: On the U2000, query the communication status of the port on the board to determine the port where the ESC communication fails. Disable all the ESC channels with NE communication failure on the network. After the entire system is commissioned and the optical power values on the entire line are stable, refer to Step 2 to enable the previously disabled ESC channels.

Whether the optical supervisory channel (OSC) mode and the electrical supervisory channel (ESC) mode of OSN 8800 devices can be used together
You are not advised to use the OSC and ESC modes together. You can disable the ESC mode through the GCC0 channel on an optical board.

what are diffirence between PIM-SM and PIM-DM
PIM-DM: Small-scale LANs where multicast group members are distributed densely. Using the flood-prune mechanism, PIM-DM creates and maintains a unidirectional and loop-free SPT connecting a multicast source and group members. PIM-SM(ASM model): Large-scale network where multicast group members are distributed sparsely. An MDT is set up when receivers join a multicast group. PIM-SM needs to maintain an RP, set up an RPT, and register a multicast source. PIM-SM(SSM model): Scenarios where user hosts know the exact positions of multicast sources in advance and can specify the sources from which they want to receive data before they join multicast groups. PIM-SSM does not need to maintain an RP, set up an RPT, or register a multicast source.

Difference between live mode and presentation
Differences between live mode and presentation are as follows: Presentation: When the main video is switched, the presentation remains unchanged. During a conference in Presentation mode, only one site can share the presentation at a time. Live: When the main video is switched, the presentation viewed by each site is also switched. During a conference in Live mode, multiple sites can send presentations simultaneously.

Whether an SC2 board can concurrently process OSC signals and ESC signals
Processing for OSC signals is different from that for ESC signals. An SC2 board concurrently processes two OSC signals of different directions, transits and exacts the system overhead, and sends the signals to the SCC board. OSC signals occupy a dedicated wavelength for transmitting monitoring and OAM information. Transmission of ESC signals does not require dedicated monitoring units such as SC2. The ESC signals and service information are carried over the same wavelength, which does not require extra wavelength resources.

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