The Marconi OMS 1664 (Optical MultiService Metro‑Edge) is a carrier-grade SDH add/drop multiplexer engineered for deployment in metro and regional network layers. As part of the OMS 1600 family, the OMS 1664 delivers flexible transport and switching for mixed-service environments, enabling seamless delivery of TDM and packet-based traffic such as Ethernet, PDH, and SDH—all within one compact chassis.
What sets the OMS 1664 apart is its highly adaptive architecture: it supports STM‑1, STM‑4, STM‑16, and STM‑64 line interfaces depending on switch and line card configurations. With a 128×128 non-blocking VC‑12-level switch matrix, it can support high port density and granular service routing over a single rack unit, dramatically simplifying network topology.
The platform’s versatility shines in its support for both legacy and emerging services—capable of aggregating up to 120 STM‑1 tributary channels or housing up to 504 × 2 Mb/s ports in one shelf. For packet-centric traffic, it supports Ethernet Private Line (EPL), Ethernet Private LAN (EVPLAN), VLAN-aware bridging, RSTP, and LACP functionality, enabling advanced Layer‑2 services and VPNs.
Carrier-grade performance is supported by SDH protection mechanisms including MSP, SNCP, and MS‑SPRING, along with robust card and path-level resilience for five‑nine availability. The design enables in-service upgrades (e.g., from STM‑16 to STM‑64) without downtime by swapping line cards and upgradeable switch planes.
For synchronized transport, the OMS 1664 accepts SDH clocks, external timing sources, or internal free-run operation—all compliant with G.703/704 standards—for robust support of mobile backhaul and time-sensitive services.
High-Capacity SDH Switching
Features a 128×128 non-blocking VC-12 cross-connect matrix for efficient grooming and service delivery across large metro and regional networks.
Flexible Line Rate Support
Supports STM-1, STM-4, STM-16, and STM-64 interfaces, allowing scalable deployment across various layers of the transport network.
Multi-Service Capability
Delivers SDH, PDH (E1/T1, E3/T3), and Ethernet services on a single platform, ideal for both legacy and next-generation service environments.
Ethernet over SDH Support
Offers Ethernet transport using GFP, VCAT, and LCAS technologies, enabling efficient delivery of packet-based services over existing SDH infrastructure.
Advanced Ethernet Features
Supports VLAN tagging, Q-in-Q, RSTP/MSTP, link aggregation (LACP), and MEF-compliant Ethernet Private Line (EPL) and Ethernet Private LAN (EVPLAN) services.
High-Density Tributary Support
Accommodates up to 504 x 2 Mb/s (E1) ports or 120 STM-1 tributary interfaces in a single sub-rack, making it ideal for large aggregation points.
Resilience and Protection
Built-in SDH protection mechanisms including 1+1 MSP, SNCP, and MS-SPRING, along with support for redundant power and switching modules.
Carrier-Grade Reliability
Designed for five-nines (99.999%) uptime with hot-swappable cards, redundant components, and in-service upgrade capabilities.
Synchronization Options
Supports external timing sources, SDH-derived synchronization, and free-run timing modes, compliant with G.703, G.704, and G.813 standards.
Comprehensive Network Management
Fully manageable through centralized systems such as Ericsson’s ServiceOn Optical and standard SNMP-based tools.
Platform Overview & Architecture
The OMS 1664 is part of the Marconi OMS 1600 family—a compact, multiservice SDH platform that combines TDM and packet transport for metro and regional networks. It supports STM-1 through STM-64 line interfaces using flexible switch and line card configurations. The system features a 128×128 VC‑12 non-blocking switch matrix, providing efficient grooming for high-density transport within a compact subrack.
Switch Capacity & Upgradeability
Base configuration provides switching for 128 × STM-1
Supports in-service upgrades from STM-16 to STM-64 via swap-out line cards and modular switch enhancements
Larger configurations within the OMS 1600 family support up to 384 × STM‑1
Supported Services & Interfaces
TDM/SDH: E1/T1, E3/T3, STM‑1/4/16/64 tributaries, with multi-rate and SFP-based interface options
Ethernet: Fast Ethernet and Gigabit Ethernet with MEF-compliant support for Ethernet Private Line (EPL) and Ethernet Private LAN (EVPLAN) services
Ethernet mapped over SDH using GFP, VCAT, and LCAS into VC-12, VC-3, or VC-4 payloads
High-density support for up to 504 × E1 ports or 120 × STM‑1 tributary interfaces in a single chassis
Resilience & Protection
Supports robust SDH protection schemes including:
1+1 MSP (Multiplex Section Protection)
1:n MSP
SNCP (Sub-Network Connection Protection)
MS-SPRING for ring topologies
Failover switching within 50 milliseconds
Redundant core and interface cards, hot-swappable modules, and in-service upgrade support
Synchronization
Accepts synchronization from multiple sources:
SDH-derived clocks
External G.703/G.704-compliant timing sources
Internal oscillator with holdover capability
Network Management
Managed via Ericsson ServiceOn Optical or ServiceOn Access platforms
Local management supported via CLI and SNMP
Full FCAPS functionality (Fault, Configuration, Accounting, Performance, Security)
Additional Capabilities
CWDM/DWDM optics available for wavelength services and fiber efficiency
Layer 2 Ethernet features: VLAN tagging, Q-in-Q, RSTP, LAG (link aggregation), jumbo frame support
Ethernet OAM support (IEEE 802.1ag and ITU-T Y.1731) for service monitoring and assurance
Modular 48/60 VDC power supply support with redundancy and hold-up options
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