The KEYMILE ROFBU 367 198/1 (hardware revision R1A) is a plug-in card identified by the functional designation NEBRA, an Ethernet-over-SDH (EoS) service unit for the Keymile UMUX 1500/1200 multi-service access platform. According to Keymile's official datasheet, NEBRA (together with its sibling unit NEBRO) opens the world of Fast Ethernet and Gigabit Ethernet transport on SDH access networks, enabling operators to deliver Ethernet-based business services reliably and cost-efficiently over an SDH backbone. It supports VLAN tag stacking, traffic prioritization per IEEE 802.1p, and LCAS (Link Capacity Adjustment Scheme), making it well suited for bandwidth-intensive point-to-point applications such as corporate internet access, LAN interconnections, and VPNs. Thanks to UMUX's carrier-grade reliability and protected Ethernet-over-SDH transport, NEBRA/NEBRO units are widely used in dedicated networks of railways, power utilities, and other private network operators. Keymile was acquired by ABB in 2017 and the UMUX range was later discontinued; this card is now sourced mainly as a refurbished or pulled spare part.
Key Features:
- Ethernet over SDH (EoS) service unit for UMUX 1500/1200
- Supports Fast Ethernet and Gigabit Ethernet transport over SDH
- VLAN tag stacking and IEEE 802.1p traffic prioritization
- LCAS (Link Capacity Adjustment Scheme) support
- Electrical and optical customer interfaces (100BaseT / 100BaseFX)
- Two front-panel status/alarm LEDs
- Managed via Keymile UCST/UNEM network management tools
Technical Specifications:
- Manufacturer Part Number: ROFBU 367 198/1
- Hardware Revision: R1A
- Manufacturer ID: 120771
- Functional Unit Type: NEBRA
- Manufacturer: KEYMILE AG, Bern-Liebefeld, Switzerland
- Platform Compatibility: UMUX 1500, UMUX 1200
- Supported Services: Ethernet Switching, Ethernet over SDH transport, Performance Monitoring
- Transport Standards: ITU-T G.707 (Virtual Concatenation), ITU-T G.7041 (GFP), ITU-T G.7042 (LCAS)
- Customer Interfaces: 100BaseT (electrical), 100BaseFX (optical)
- Form Factor: Single mechanical slot, standard UMUX plug-in unit
- Indicators: 2 x red status/alarm LEDs
