This part is a kind of semiconductor called B1601S.

Function of this product has 10/100 BASE-T MAGNETICS MODULES.

Manufacturers : WAHSONIC

Image and pinout :

Some of the text within the PDF file :

SPECIFICATION FOR APPROVAL 产品承认书 CUSTOMER: CUSTOMER NO. : JXD PART NO. : B1601S DESCRIPTION: 10/100 BASE-T MAGNETICS MODULES ATTACHMENT: ■ SPECIFICATION ■ SAMPLE Q’TY OF SAMPLES PCS CUSTOMER APPROVAL (客户承认章) JXD APPROVAL (公司承认章) SALES BY: SALES BY: QA DEPT. : CHECKED BY: ENG. DEPT.: APPROVAL BY: 華馳精密股份有限公司 W A H S O N I C Corporation TEL: 03-5358977 FAX:03-5322132 PLEASE REPLY THIS SHEET TO US AFTER SIGNATURE(请签字后回传本页) 1. FEATURES: 1.1 Compatible with various 10/100 Base-TX transceiver requiring 1:1 transmit and 1:1 receive turns ratio 1.2 Compliant with IEEE 802.3 standard including baseline wander compensation specification of 350uH OCL when Biased at 8mA from 0℃ to 70℃ 1.3 Low profile Surf [ ... ]

B1601S PDF Datasheet Download