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DOCSIS 3.1 System Diplexer

Provides Insight Into The Diplexer Configuration Of A DOCSIS 3.1 Cable Modem (Upstream/Downstream Band Splits, Capabilities, And Configured Band Edges). Use This To Audit Band Plans And Validate Mid-Split/High-Split Compatibility.

Endpoint

POST /docs/if31/system/diplexer

Request

Use the SNMP-only format: Common → Request TFTP parameters are not required.

Response

This endpoint returns the standard envelope described in Common → Response (mac_address, status, message, data).

Abbreviated Example

{
  "mac_address": "aa:bb:cc:dd:ee:ff",
  "status": 0,
  "message": null,
  "data": {
    "diplexer": {
      "diplexer_capability": 28,
      "cfg_band_edge": 204000000,
      "ds_lower_capability": 3,
      "cfg_ds_lower_band_edge": 258000000,
      "ds_upper_capability": 2,
      "cfg_ds_upper_band_edge": 1794000000
    }
  }
}

Diplexer Fields

Field Type Units Description
diplexer_capability int — Upstream/Downstream diplexer capability code.
cfg_band_edge int Hz Configured upstream band edge frequency.
ds_lower_capability int — Downstream lower frequency capability code.
cfg_ds_lower_band_edge int Hz Configured downstream lower band edge.
ds_upper_capability int — Downstream upper frequency capability code.
cfg_ds_upper_band_edge int Hz Configured downstream upper band edge.

Notes

  • Values are reported in Hertz (Hz).
  • Capability codes are device/implementation specific (per CableLabs/vendor definitions).
  • Compare configured edges with plant split (e.g., 85 MHz mid-split, 204 MHz high-split) to verify alignment.