X 21 Cable
Overview
Product sourcing insights & recommendations
The X.21 cable market in 2026 is defined by its role as a high-reliability bridge between legacy synchronous infrastructure and modern fiber-optic networks. While broader industry growth is driven by electrification, X.21 remains essential for radar control, military communications, and industrial monitoring due to its signal integrity and synchronous timing. Omnitron-SystemsNpcelectric
Key findings include:
- Technical Resilience: X.21 relies on DB15 (DA-15) connectors and differential V.11 signaling to maintain data integrity over long distances. AllpinoutsArcelect
- Market Dynamics: Global wire and cable demand is expected to reach $245–255 billion by 2026, with a growing niche for TAA/NDAA-compliant serial assemblies in government sectors. NpcelectricOmnitron-Systems
- Modern Bridging: The primary growth opportunity lies in Serial-to-Fiber media converters, which extend X.21 signals up to 120km for high-security environments. Omnitron-Systems
I have compiled a detailed report covering technical pinouts, niche use cases, and market outlooks for 2026, alongside a list of current B2B product options for sourcing.
I can help you further with these X.21 cable needs:
X.21 Db15 Serial Cable
Products · 2 lists
Customized DB15 Serial Cable 15 Pin D-SUB RS232 Serial Cable Male to Male Extension Cable Assembly for Data Transmission
Dongguan Tpxian Electronic Co., Ltd.verified🇨🇳CN2 yrs
Industrial DB15 Connection Cable Male to Male Female 15 Pin Data Cable Double Shielded 2 Rows of 15 Pin Serial Port Cable
D-SUB 15 Pin Serial DB15 Female to Male Cable 15pin Parallel Extension Cable
Guangzhou Chuangyingxin Electronics Co., Ltd.🇨🇳CN6 yrs
A Full Range of Copper HDB15 USB Data Cables, As Well As HDB15 Male-to-female Extension Data signal Cables
Shenzhen Lvxinda Electronics Co., Ltd.🇨🇳CN1 yr
DB9 DB25 DB15 Serial Port Terminal Line Male Female Oxygen-free Copper Connection Cable
Shenzhen GMD Technology Co., Ltd.🇨🇳CN1 yr
Factory Industrial DB15 Connector Cable Male to Male Female 15 Pin Double Shielded 2 Rows Serial Port Extension Cable
15-Way D-Sub 15 Pin Male Connector to DB-15 Pin Female Serial Cable PVC Insulated for Computer Applications
Shenzhen Yrnova Technology Co., Ltd.🇨🇳CN2 yrs
Double-layer DB15 Cable Male to Male Braid Shielded D-SUB 15 Pin Straight Through Extension Cord for CNC UPS PLC Servo Driver
Factory Custom RS232 Serial Cable DB15 Male to Female D-Sub 15pin Connector Braided Shielded Serial Extension Cable
Dongguan Hexie New Energy Technology Co., Ltd.verified🇨🇳CN17 yrs
0.5M DB15 Male to Male Serial Cable, 15 Pin Straight Through Extension for CNC PLC PC
Dongguan Kuncan Electronics Co., Ltd.verified🇨🇳CN2 yrs
DB15 Male to Female RS232 Serial Cable 15 Pin D-Sub, Shielded Stranded Copper Wire with Die-Cast Metal Hoods
Ningbo Farsince Electronic Co., Ltd.🇨🇳CN7 yrs
EBY Industrial DB9 DB15 DB25 DB37 Connection Wire Male Female Single Head Data Cable 9pin RS232 Serial Port Line
Guangzhou EBY Optoelectronic Technology Co., Ltd.🇨🇳CN9 yrs
DB9 DB15 DB25 DB37 M/F RS232 Serial Cable D-SUB 9 Pin 15 25 37 Pin Copper Conductor PVC Insulation 1.8M Extension Cable
2302094 Serial Cable, D-sub 15-pin Male to Db15 Female Connector, 3 M Long, Gray Semi-rigid Pvc Jacket, Cul, Csa, and Certified
Xiamen Nuotuosen Automation Equipment Co., Ltd.🇨🇳CN1 yr
DB15 Male to DB9 Female RS232 Serial Cable with Braid Shielding for Projector & Computer Featuring DB25 Connector Type
Shenzhen Lcr Industries Technology Co., Ltd.🇨🇳CN10 yrs
Custom Over Molding Cable Assemblies DB9 DB15 DB25 DB37 DB44 USB RS232 Serial Cables
Yz-Link Technology Co., Ltd.verified🇨🇳CN5 yrs
Db9 Db15 Db25 Connector Cable Industrial Grade Male Female Plug Cord Shielded Signal Wire 9/15/25 Pin Com Rs232 Serial Port Line
Dongguan Annxin Electronics Co., Ltd.verified🇨🇳CN9 yrs
DB9 DB15 DB25 DB37 M/F Connector RS232 Serial Cable D-SUB 9 Pin 15 25 37 PIN Male/female Extension Cable
Dongguan Bofan Technology Co., Ltd.verified🇨🇳CN9 yrs
D-Sub 15 Pin RS232 Serial Cable Straight Through Male to Male DB15 Cable
Shenzhen Aovlex-Link Technology Co., Ltd.verified🇨🇳CN10 yrs
Db15 Extension Cable Rs232 D-sub 15 Pin Male Female Double Shielded Cable Connector Power DB15 Cables
Dongguan Mao Jia Plastic Electronics Co., Ltd.verified🇨🇳CN11 yrs
3m Black Right Angle Female Plug Db15 Serial Extension Cable 15C*28AWG
Shenzhen Ya Tai Xin Electronics Co., Ltd.🇨🇳CN7 yrs
DB15F to DB15F Male to Female / Male Connector DB9 Serial Cable Null Modem Cable
Dongguan Honshi Electronics Co., Ltd.🇨🇳CN3 yrs
Pure Copper DB15 Serial Port Cable 90/270 Degree Elbow Connection Line Gold-plating 15Pin Male Female Extension Wire Automobile
Huizhou Youlong Industrial Co., Ltd.verified🇨🇳CN2 yrs
RS232 Serial cable DB15P Male TO DB15P Male Slide lock cable db15pin Male/female extension cable
Dongguan Yingsheng Electronic Technology Co., Ltd.🇨🇳CN7 yrs
Custom DB15 PIN Male D-sub Serial Port Cable to 4P Terminal Harness Wire
Dongguan Goochain Technology Co., Ltd.verified🇨🇳CN11 yrsDeep Dive · Full Report
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Sources & References
22 sources cited · Verified industry data & reports
The X.21 Interface a Tutorial
ARC Electronics
X21 is a physical and electrical interface. X.21 is a state-driven protocol running full duplex at 9600 bps to 64 Kbps with subscriber networks. plex at 9600 ...
ITU X.21 V11 CABLE PINOUT SPECIFICATIONS
Cisco Community
Here is a URL that gives many of the pinouts for the cables used by the modular access routers. Hopefully it includes the cables you are asking ...
X.21
Wikipedia
X21, is an interface specification for differential communications. X.21 was the first digital signaling interface developed.
ITU-TSS X.21 Serial 15 pin
AllPinouts
X.21 is an ITU-T synchronous serial interface for public data networks using a 15-pin ISO 4903 DA-15 connector with V.10/V.11 signalling.
X.21
International Telecommunication Union
This conductor may be used to reduce environmental signal interference at the interface.
X.21 Standard Interface for Digital Networks
ITU Online IT Training
Quick Answer. X.21 is a standard interface for connecting data terminal equipment to data circuit-terminating equipment in digital networks.