ISM321B-20

TP-Link ISM321B-20 — 1000Base-BX WDM Bi-Directional Industrial SFP Module. Manufacturer reference.

TP-Link · Full reference: ISM321B-20

Manufacturer reference

Manufacturer details describe the cited version. Confirm the exact unit and intended system.

Product type: 1000Base-BX WDM Bi-Directional Industrial SFP Module
Standards and Protocols: IEEE 802.3z,TCP/IP
Wave Length: Tx: 1310 nm; Rx: 1550 nm
Power Supply: 3.3V
Fiber Type: 9/125 µm; Single-mode
Max. Cable Length: 20 km
Data Rate: 1.25Gbps
Connector: LC Simplex
Regulatory Compliance: FCC, CE
Environment: Operating Temperature: -40˚C~ 85˚C (-40˚C~ 185˚F); Storage Temperature: -40℃~85℃ (-40˚C~ 185˚F); Operating Humidity: 5%~85% non-condensing; Storage Humidity: 5%~85% non-condensing
Hardware Features (supported): DDM, SFP-MSA, Hot Swappable
Dimensions (W × D × H): 2.2*0.5* 0.4 in (56.4*13.4*11.0 mm)
Package Content: ISM321LB-20; Installation Guide

Specifications are from the manufacturer's official product page.
ISD stock, price, Malaysian warranty and delivery are confirmed separately. Confirm the exact model suffix and supplied revision.

Manufacturer source checked 2026-11-02. The supplied unit and local terms require confirmation.