---
manufacturer: FS
model: FMU-MC042733
slug: fs-fmu-mc042733
comments: '[4 Channels 1270-1330nm, LC/UPC, Dual Fiber, Low Insertion Loss CWDM Mux Demux, FMU Plug-in Module](https://www.fs.com/products/42972.html)'
part_number: '42972'
u_height: 0
is_full_depth: false
subdevice_role: child
front-ports:
  - name: '1270'
    type: lc
    rear_port: Line
    rear_port_position: 1
  - name: '1290'
    type: lc
    rear_port: Line
    rear_port_position: 2
  - name: '1310'
    type: lc
    rear_port: Line
    rear_port_position: 3
  - name: '1330'
    type: lc
    rear_port: Line
    rear_port_position: 4
rear-ports:
  - name: Line
    type: lc
    positions: 5
