Differences between 100M and 1000M fiber optic transceivers and key points for selection

What is the difference between 100M and 100M fiber optic transceivers? Choosing the wrong one will jam the entire link.

Published: 2025-10-12 EB-LINK Views: 1485 Optical fiber transceiver, 100M, Gigabit, speed selection

There is a strange thing that is common in renovation projects: the optical path test is normal and the transceiver indicator lights are all on, but the video playback is stuck and the file transfer is slow. At the end of the investigation, it is often found that 100M and 100M fiber optic transceivers are mixed, and the speed is reduced to the lowest level. This article explains the differences and selection judgment between the two.

The difference is not just a tenfold number

The line speed of the 100M port is 100M, and the Gigabit port is 1000M. The actual throughput is roughly the difference between more than 90Mbit and more than 900Mbit. More importantly, ordinary fiber optic transceivers are transparent transmission devices and do not perform cross-rate conversion: when the 100M end to the Gigabit end either negotiates to reduce the speed, or simply fails, even if the port can be negotiated successfully, multicast and voice services often have problems first.100M single-mode dual-fiber one optical and one electrical fiber optic transceiver and Gigabit single mode dual fiber one optical one electrical fiber optic transceiverThe appearance is almost the same and can only be distinguished by the nameplate speed.

Set the rate according to the heaviest flow rate

A single-channel high-definition surveillance code stream is generally 4-8M. If more than a dozen cameras are connected to one optical port, it must be planned as Gigabit.
For light traffic such as access control and broadcasting, 100 Mbps is sufficient, but the server and aggregation uplink must start at Gigabit.
Office ports mainly used for wireless access and printing are usually covered by 100Mbps.
If the budget allows, it is recommended to directly upgrade to Gigabit to avoid wholesale replacement during later expansion.

Mixed remediation and acceptance

When the speeds at both ends of an existing link are inconsistent, a safe approach is to switch to the same speed at both ends simultaneously. For projects constructed in phases, it is more economical to set the schedule based on the final flow rate first than to set the schedule based on the first phase. EB-LINK recommends checking the number of terminals and code stream list of each link during the plan review stage. When accepting, use the measured throughput instead of just looking at the indicator lights. If you are not sure about the selection, please call 0755-83179002 for consultation.