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XMC20 Full Hybrid MSAN Platform

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XMC20 Full Hybrid Multi-Service Access & Transport Platform


The XMC20 operates as a centralized MPLS-TP switch, supporting state-of-the-art Packet-based Transport Networks (PTNs), to achieve the highest reliability in the market today (e.g. sub 50 ms switchover times). Simultaneously, it can operate as a SDH/PDH multiplexer for TDM transport networks achieving hitless switchovers in case of link failures. Having such a broad set of services and different technologies from one network element allows great flexibility in the total engineering of the solution. One single XMC20 platform covers the needs of existing legacy networks, while at the same time providing future-proof equipment capable of evolving towards packet-based transport networks. This reduces the operational costs for customers’ networks and enhances the reliability and the availability of services through reduced network complexity. All services in XMC20 are administered by a central network management system (UNEM), which allows the monitoring of network performance, alarms, and fault management. The network management system is also capable of protection mechanisms that allow full redundancy of the management of the network. This integrated management system brings maximum synergy through managing all the services on one platform. In addition, an easy-to-use local craft terminal (ECST) is available for our customers, which provides offline configuration, enabling commissioning of a network in the office followed by later deployment to the node.

Packet Based Data Transmission – Ethernet/IP

Ethernet/IP services in XMC20 come naturally to its inherent Ethernet-switch design, which include: a native Ethernet/IP backplane with a switching capacity starting at 64 Gbps bi-directional. This native Ethernet/IP system functionality allows every packet-capable unit in the subrack, connected to the Ethernet/IP backplane, to act as a switch module or as an attachment circuit for MPLS-TP transport. All Ethernet/IP functions can fully operate simultaneously alongside the TDM services and functions in the XMC20 system. Each slot is connected to the core unit with 10 Gbps. This guarantees sufficient bandwidth at any time for mission-critical Ethernet applications. Packet-based access options include upgradable n x 1 GbE links with IEEE 802.1Q switching. Link protection mechanisms include xSTP and ERPS (Ethernet Ring Protection Switching) to guarantee highest availability.

In addition, the XMC20 enables the powering of devices at remote locations via Ethernet. With its PoE+ unit (Power over Ethernet) up to 30 W can be provided for every connected port. Packet-based Transport Networks (PTNs) are supported by a central unit with 1 GbE optical/electrical and/or 10 GbE optical connections. A central MPLS-TP engine tunnels Ethernet/IP-data (Attachment Circuits) via pre-determined bi-directional co-routed Label Switched Paths (LSPs) with 1:1 link protection to achieve recovery times below 50 ms. XMC20 also offers comprehensive QoS functions (Quality of Service) to ensure an efficient and reliable transmission over the PTNs.

Packet Based Data Transmission – Ethernet IP application


Circuit Switched Data Transmission – TDM

For the TDM uplink, customers can choose between n x E1 and SDH with up to STM-16. XMC20 comes with EoS functionality (Ethernet over SDH). With it, customers who have a TDM backbone can transport Ethernet services over the SDH network – thus a second transport network is not necessary. TDM services in XMC20 are built on a TDM capable system solution including: native TDM backplane and a PDH cross connect with a capacity of 128 x E1 at 64 k level non-blocking. XMC20 allows customers to offer extensive voice services as POTS and E&M, including conferencing functions for voice channels. For TDM data services, XMC20 provides narrowband and broadband interfaces, for example E1, V.24, V.35, X.21 and RS-485, including conferencing for data channels. 64 kbit/s G.703 codirectional and contradirectional is also supported.

SHDSL interfaces are available for trunking and the connection of remote locations, e.g. pump stations along pipelines. Regenerators are provided to connect locations beyond the standard SHDSL transmission range. Reliable data transmission is secured with a multiplicity of protection and redundancy functions, such as 1+1 and 1:1 equipment protection, 1+1 path protection, or SNCP and LTP. Should the TDM data be transported over a Packet-based Transport Network (MPLS-TP), data will be converted with XMC20 Circuit Emulation over Packet capabilities.

Circuit Switched Data Transmission – TDM application

System Features

System architecture:

  • Full hybrid modular platform, native TDM and Ethernet-based backplane access
  • IEEE 802.1Q Switching
  • Multi-Protocol Label Switching – Transport Profile (MPLS-TP)
  • Extensive TDM-capabilities

Unit Protection: 1:1 equipment protection for core unit; 1:1 protection for specific units

Link Protection: Ethernet Ring Protection Switching – ERPS (G.8032 v2); MPLS-TP 1:1 Linear Protection
TDM protection mechanisms: 1+1 path protection; SNCP (Subnetwork Connection Protection)
Ethernet functionality:

  • Customer Bridging (802.1Q VLAN), 4096 VLANs supported
  • Port-based VLAN tunneling (Q-in-Q)
  • Port-/PCP-/DSCP-based classification (CoS) of ingress traffic with 8 priority queues per port
  • Maximum frame length of up to 9126 bytes (Jumbo Frames)
  • Ingress Flow Policing (Bandwidth Profiles)
  • Port Security (Ingress Storm Control a.k.a. Flood Control)
  • Spanning Tree Protocols (MSTP, RSTP)

MPLS-TP functionality:

  • MPLS-TP PE/P function acc. to IETF RFC5921
  • Deterministic (static) PW/LSP configuration via management plane (without control) plane
  • Co-routed bidirectional LSP with 1:1 linear protection
  • Layer 2 VPNs (VPWS, VPLS, H-VPLS)

Switching capacity: > 64 Gbps wire-speed
TDM Cross-connect capacity: 128 x 2 Mbps at 64 k level non-blocking


PETS function: Plesiosynchronous Equipment Timing Source for 2 Mbps traffic interfaces
SETS function: Synchronous Equipment Timing Source per SDH sector
SyncE function: Synchronous Ethernet acc. to ITU-T G.8262 to transfer clock signals over Ethernet PHY layer
Packet-based Synchronization: Precision Time Protocol acc. to IEEE 1588v2 for the synchronization of NE clock and ToD


TDMoIP gateway: SAToP functionality
Ethernet over SDH gateway: GFP acc. to ITU-T G.7041, LCAS acc. to ITU-T G.7042
Ethernet over PDH gateway: PPP and HDLC encapsulation
Voice media gateway: Session Initiation Protocol – SIP

Interfaces - WAN Side & Ports per Core/Transport units

MPLS-TP: 2 x Optical (SFP+/SFP); 3 x Electrical (RJ-45)
SDH: 2 x STM-16/4/1 (optical), 2 x STM-1 (optical/electrical), 4 x 100/1000BaseT
Management: 10/100/1000BaseT for central management

Interfaces - LAN Side & Ports per Service/Access units

Ethernet (Optical/Electrical, SFP-based): 12
Ethernet (Electrical with PoE+): 12
Ethernet (Electrical, high density): 24
Ethernet (TDM transport, with IPv4 routing): 4
POTS: 16 (with enhanced voltage protection), 64
POTS (exchange line interface): 12
E&M: 8
Serial data interfaces (V.24, V.35, X.21): 4
E1 (G.703): 8, 48

Network Management

Management functions:

  • 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

Management interface: SNMP
Local management system: ECST
Central management system: UNEM


Number of slots: 21 on XMC25; 8 on XMC23; 4 on XMC22
Bandwidth per slot:

  • XMC25: 1 and 10 Gbps protected (1:1)
  • XMC23: backplane access
  • XMC22: 1 Gbps protected (1:1) backplane access

Dimensions (w x d x h) & Weights

19“ subrack with front cover:

  • XMC25: 482.6 x 286 x 308.2 mm & 7430 g
  • XMC23: 482.6 x 283 x 177 mm & 5.050 g
  • XMC22: 482,6 x 306 x 95 mm & 3.600 g

Installation: 19“ and ETSI mounting practice

EMC, Safety & Power

Product family standard: Telecommunication network equipment – EN 300 386 V1.3.2, class B
Safety: IEC/EN 60950-1
Input voltage nominal (min/max): –48/–60 V DC (–39.5 V DC … –72 V DC)

Operating Environment

Temperature range system: –25 °C … +60 °C
Temperature range system (fanless operation): –25 °C … +55 °C
Humidity: According to class 3.2, up to 95 %, non-condensing