Access control NFC tag Grandstream GDS37XX G-AC1 MIFARE Classic 13.56 MHz

Access control NFC tag Grandstream GDS37XX G-AC1 MIFARE Classic 13.56 MHz is a compact, passive contactless key fob designed for proximity authentication with Grandstream GDS37XX series door systems and compatible readers. Based on MIFARE Classic EV1 (S50) technology and operating at 13.56 MHz, this non-writable credential receives power from the reader’s radio field and communicates with the GDS3700 series to grant or deny access. The tag is supplied in a PVC/ABS laminated housing and is intended for routine use in access control, time attendance and security applications where short-range NFC identification is required.

Advantages

The G-AC1 fob offers reliable passive operation with no internal battery, a compact form factor for convenient carrying, and straightforward compatibility with Grandstream GDS3700-series readers. Its MIFARE Classic EV1 chipset provides standard contactless identification with 1 KB memory capacity and an operating distance exceeding 25 mm. The product is durable across a wide temperature range and rated for more than 100,000 read cycles, making it suitable for daily use in workplace and visitor management scenarios.

Suitable for

• Employee access badges for Grandstream GDS37XX door systems
• Visitor passes and temporary credentials
• Time and attendance identification
• Secure entry control in offices, shared facilities and residential buildings

Key specifications

• Card technology: MIFARE Classic EV1 (S50)
• Operating frequency: 13.56 MHz
• Memory capacity: 1 KB
• Operating distance: > 25 mm (depends on reader and installation)
• Durability: > 100,000 read cycles
• Materials and encapsulation: PVC laminated housing with ABS components
• Power supply: Passive (inductive, powered by reader field)
• Operating temperature: -30 °C to 60 °C
• Storage temperature: -30 °C to 80 °C
• Dimensions: 41 mm x 32 mm x 3.8 mm (+0.5 mm)

How to use

Present the G-AC1 fob to a compatible Grandstream GDS37XX series reader within the recommended operating distance; the reader supplies power and reads the non-writable credential. For initial setup, enroll the tag in the access control system according to the GDS37XX configuration procedures so that the reader associates the tag’s identifier with a user record or access profile. No battery or charging is required; the fob operates whenever it is within the reader’s field.

Usage recommendations

Store and handle the fob to avoid severe mechanical stress or exposure to corrosive chemicals. Maintain reader-to-tag alignment and keep the tag within the suggested read range for reliable operation. For security and lifecycle management, issue and revoke credentials through the Grandstream access control system and periodically verify access lists. Avoid attempting to rewrite the non-writable credential; use supported procedures for replacing or deactivating tags.