Comparison between OSC and ESC functions

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.

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