"DS1" meaning in English

{
  "forms": [
    {
      "form": "DS1s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "DS1 (plural DS1s)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "See T1."
      ],
      "id": "en-DS1-en-noun-h4vCwEdy",
      "links": [
        [
          "T1",
          "T1"
        ]
      ],
      "raw_glosses": [
        "(abbreviation for \"digital signal 1.\") See T1."
      ],
      "raw_tags": [
        "for \"digital signal 1.\""
      ],
      "related": [
        {
          "sense": "ATIS Telecom Glossary entries for",
          "urls": [
            "https://web.archive.org/web/20090627013046/http://www.atis.org/glossary/definition.aspx?id=963"
          ],
          "word": "T1"
        }
      ],
      "tags": [
        "abbreviation"
      ]
    }
  ],
  "word": "DS1"
}

{
  "forms": [
    {
      "form": "DS1s",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "DS1 (plural DS1s)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "sense": "ATIS Telecom Glossary entries for",
      "urls": [
        "https://web.archive.org/web/20090627013046/http://www.atis.org/glossary/definition.aspx?id=963"
      ],
      "word": "T1"
    }
  ],
  "senses": [
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      "categories": [
        "English countable nouns",
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        "English nouns",
        "English terms spelled with numbers",
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        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "See T1."
      ],
      "links": [
        [
          "T1",
          "T1"
        ]
      ],
      "raw_glosses": [
        "(abbreviation for \"digital signal 1.\") See T1."
      ],
      "raw_tags": [
        "for \"digital signal 1.\""
      ],
      "tags": [
        "abbreviation"
      ]
    }
  ],
  "word": "DS1"
}