H04J 3/1611
Synchronous digital hierarchy [sdh] or sonet
Official title: {Synchronous digital hierarchy [SDH] or SONET (H04J3/1664 takes precedence for interactions with OTN)}
H04J3/1611 (Synchronous digital hierarchy [sdh] or sonet) appears on 883 US grants and 644 published applications in this corpus.
Search patents in H04J- Granted patents
- 883
- Published applications
- 644
- Assignees
- 240
- Inventors
- 1,793
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 7 | 0 |
| 1992 | 9 | 0 |
| 1993 | 16 | 0 |
| 1994 | 17 | 0 |
| 1995 | 14 | 0 |
| 1996 | 21 | 0 |
| 1997 | 11 | 0 |
| 1998 | 26 | 0 |
| 1999 | 20 | 0 |
| 2000 | 28 | 0 |
| 2001 | 22 | 15 |
| 2002 | 18 | 70 |
| 2003 | 20 | 82 |
| 2004 | 49 | 68 |
| 2005 | 51 | 71 |
| 2006 | 90 | 72 |
| 2007 | 49 | 68 |
| 2008 | 69 | 55 |
| 2009 | 73 | 28 |
| 2010 | 78 | 26 |
| 2011 | 54 | 18 |
| 2012 | 34 | 21 |
| 2013 | 22 | 7 |
| 2014 | 22 | 8 |
| 2015 | 13 | 6 |
| 2016 | 9 | 0 |
| 2017 | 4 | 3 |
| 2018 | 2 | 6 |
| 2019 | 6 | 5 |
| 2020 | 8 | 7 |
| 2021 | 4 | 1 |
| 2022 | 3 | 1 |
| 2023 | 2 | 3 |
| 2024 | 1 | 2 |
| 2025 | 1 | 1 |
| 2026 | 5 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Systems and methods for enhanced autonegotiation29 Sep 2026US 12,750,316 B2Level 3 Communications, LLC
- Data security for networks combining encryption with error correction5 May 2026US 12,621,174 B2Cisco Technology, Inc.
- Method and apparatus for sending and receiving multiframe, device, system, and storage medium24 Mar 2026US 12,587,298 B2Zte Corporation
- Data transmission method and apparatus, network device, and storage medium10 Mar 2026US 12,574,135 B2Zte Corporation
- Cascaded connection matrices in a distributed cross-connection system3 Feb 2026US RE50,784 E1Micron Technology, Inc.
- Data security for networks combining encryption with error correction27 Feb 2025US 2025/0070989 A1Cisco Technology, Inc.
- Data transmission method and apparatus, network device, and storage medium26 Sep 2024US 2024/0322929 A1Zte Corporation
- Systems and methods for enhanced autonegotiation12 Sep 2024US 2024/0305570 A1Level 3 Communications, LLC
- Method and apparatus for sending and receiving multiframe, device, system, and storage medium20 Apr 2023US 2023/0118809 A1Zte Corporation
- Bandwidth adjustment method and terminal30 Mar 2023US 2023/0100886 A1Zte Corporation
Most cited
By later US patents
- Synchronous optical transmission system342US 5,185,736 AAlcatel NA Network Systems Corp. · 1993
- Switchable multi-drop video distribution system296US 5,867,484 AIntellect Network Technologies · 1999
- Control system and operations system interface for a network element in an access system244US 5,608,720 AHubbell Incorporated · 1997
- System and method for retransmission of data168US 6,831,901 B2OpenCell Corporation · 2004
- System for cross-connecting high speed digital SONET signals159US 4,967,405 ATranSwitch Corporation · 1990