Genuine Juniper 077-0209-000 Finisar FCMJ-8520-3-J1 SFP 1000BASE-T Copper RJ-45
Juniper SFP Gigabit copper transceiver (P/N: 077-0209-000 REV 01, Finisar OEM model FCMJ-8520-3-J1). Compliant with SFP MSA and IEEE 802.3ab 1000BASE-T standards, it utilizes an SGMII electrical interface with an integrated RJ-45 connector.This transceiver supports 10/100/1000Mbps auto-negotiation (subject to host SGMII support) and achieves a maximum reach of up to 100m over Category 5/5e unshielded twisted-pair (UTP) copper cabling. Equipped with Auto-MDI/MDI-X crossover detection, it features a hot-pluggable SFP form factor natively compatible with Juniper EX, QFX, MX, and SRX series switches and routers, expandin
Model / Product Code
FCMJ-8520-3-J1
Supported Speed
10/100/1000 Mbps Auto-Negotiate.10/100M operation requires host SGMII support
Cable Type
Cat5 / Cat5e UTP Twisted Pair
Max Transmission Distance
100m
Compliance Standard
IEEE 802.3ab 1000BASE-T
Operating Temperature
0°C to 70°C
Typical Applications
✅ Juniper EX Series Access Switches: Compatible with EX2200, EX3200, EX3300, EX3400, EX4200, EX4300, EX4550, EX4600, and EX9200 — converts SFP uplink slots to RJ45 for Cat5e/Cat6 patch connections to servers or security appliances.
✅ Multi-Platform Carrier & Enterprise Deployment: Fully supported on QFX, MX, SRX, ACX, and NFX line cards that list EX-SFP-1GE-T / 077-0209-000 for 1G copper handoff to legacy equipment.
✅ Data Center IDF/MDF Out-of-Band Management: Short copper runs ($\le 100\text{m}$) from switch SFP ports to rack-top 1G server management (IPMI/iDRAC/iLO) or console ports.
✅ Wireless AP & Edge Device Uplink: Connects standard SFP switch slots to 802.11ac/ax Wi-Fi Access Points or IP cameras for 1G data transport (Note: Data only; non-PoE).
✅ Juniper Service Contract Spare: Pre-coded genuine replacement for Juniper maintenance; J1 vendor code ensures native recognition on Junos OS without syslog compatibility alarms.