This post describes for the transformer.
The part number is HST-2027DR.
The function of this device is 10/100BASE-TX transformer module.
The manufacturer of this part is GROUP-TEK (www.group-tek.com).
See the preview image and the PDF file for more information.
1 page
Description
HST-2027DR is 10/100 Base-TX Transformer Module for Auto MDI / MDIX Applications.
A 10/100 Base-TX transformer module with Auto MDI/MDIX functionality is a component used in Ethernet networks to enable automatic configuration and connection of network devices, such as computers, switches, and routers.
Features
1. Designed to meet IEEE 802.3 requirements
2. Designed for multiport repeater & ethernet switching hub application
3. Environmental Designed to meet IR 250 degree C for 1minute
4. Primary inductance (LP):350uH,min.@100KHz 0.1Vrms 8mA
Schematic
Auto MDI/MDIX:
MDI stands for “Media Dependent Interface,” and MDIX stands for “Media Dependent Interface with Crossover.” In traditional Ethernet connections, devices have to use the correct cable type (either straight-through or crossover) to connect to each other. A straight-through cable is used to connect a computer to a switch or router, while a crossover cable is used to connect two computers directly to each other.
HST-2027DR PDF Datasheet
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