• Increase font size
  • Default font size
  • Decrease font size


E-mail Print

XMC20 COGE5 - Core Unit of the XMC20 Platform


The COGE5 is a core unit for the XMC20 subracks, designed for packet-switched transport and optimized for applications in mission-critical networks. It performs all central functions of the system and data transport for the Ethernet traffic and data synchronization.


  • Support of Optical and Electrical Ethernet interfaces
  • MPLS-TP capable for packetswitched transport networks
  • ERPS for Protection Switching in Ethernet rings
  • Core Unit Redundancy support
  • SyncE and IEEE 1588v2 on all Ethernet front ports
  • OSPF Routing for Management traffic

MPLS-TP Transport - COGE5 is capable of supporting MPLS-TP functionality, providing the application of MPLS to the construction of packet-switched transport networks. MPLS-TP allows provisioning of explicit co-routed bi-directional connection-oriented paths, protection (1:1) and restoration mechanisms (below 50 ms), comprehensive set of functions for operation and maintenance of a network without a dynamic control plane and IP forwarding.

Interfaces - COGE5 comes with three electrical interfaces and two cages for optical SFP+ or SFP modules. Two 10 GbE or 1 GbE uplinks can be realized as well as a redundant 1:1 connection for protection of the transmission. The 10/100/1000BaseT interfaces can be used for cascading or ring connection with other XMC20 or also for the uplink.

ERPS for protection switching - COGE5 supports Ethernet Ring Protection Switching (ERPS) for rapid restoration within Ethernet networks in ring topologies. ERPS compliance with ITU-T G.8032v2 allows ring interconnections supporting major/subring configurations and multiple ERP instances (or multiple logical rings.

1:1 equipment protection - COGE5 can be installed redundantly in the XMC20 subracks. One works in a standby mode and takes over operation in case a failure occurs in the active unit. This mechanism ensures highest availability of the system.

Timing and synchronization - The timing and synchronization functionalities include a 2 Mbps reference clock input as well as Synchronous Ethernet (SyncE) and IEEE 1588v2 (PTP) support. These options allow for synchronous timing and a very high timing precision of sub-microseconds that are required for various applications.

Management - All services are managed centrally via the management system UNEM or via the local craft terminal ECST.


Optical Interfaces: 2 x 10 GbE with SFP+ modules (10GBASE-LR)/GbE with SFP modules (1000BASE-SX/-LX/-EX/-ZX)
Electrical Interfaces: 3 x 10/100/1000BASE-T/TX (RJ45) with auto-negotiation (half/full duplex modes)


  • SyncE: Synchronous Ethernet acc. to ITU-T G.8262 to transfer clock signals over Ethernet physical layer.
  • SyncE ESMC: Ethernet Synchronization Messaging Channel acc. to ITU-T G.8264 for indication of clock quality level
  • PTP: Precision Time Protocol version 2 acc. to IEEE 1588-2008 for the synchronization of NE clock and time of day (ToD)

Ethernet Functions:

VLAN services:

  • Customer bridging acc. to IEEE 802.1Q-2011, 4096 VLANs supported
  • Port-based customer VLAN tunnelling (Q-in-Q)
  • Port-/PCP-/DSCP-based classification (CoS) of ingress traffic with eight priority queues per port
  • Maximum frame length of up to 9’216 bytes (Jumbo frames)

Port Mirroring: Up to 32 source ports (RX/TX traffic) to a single mirror port
Port Security: Ingress Storm Control (flood control, flood rate limiting)
Spanning tree protocols:

  • RSTP (Rapid Spanning Tree Protocol), acc. to IEEE 802.1D-2004
  • MSTP (Multiple Spanning Tree Protocol), acc. IEEE 802.1Q-2011

ERPS: Ethernet Ring Protection Switching (ERPS), acc. to ITU-T G.8032v2, supporting up to 12 ERP instances

  • MPLS-TP function acc. to IETF RFC5921
  • Deterministic (static) LSP/PW configuration without the use of control plane protocols
  • Co-routed bidirectional LSP supporting 1:1 linear protection
  • MPLS-TP L2 VPN support for VPWS and VPLS (future option)



  • Management and control of XMC20 subracks and all plug-in units
  • Database with management information, Embedded software download
  • Alarm collection and notification, External alarm interfacing via backplane and management
  • OSPF routing for management traffic, Management via PDH ECC

ECST: For local management system
UNEM: For central management system

Power Supply Input Voltage nominal (min/max): –48/–60 V DC (–39.5 V DC … –72 V DC)

Operating Temperature: According to XMC20 environmental specifications