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XMP1-LCC STM16 Large Cross Connect

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XMP1-LCC STM16 Large Cross Connect

XMP1-LCC Ethernet Ring Protection

The XMP1-LCC (Large Cross-Connect) is a compact SDH/PDH/Ethernet cross–connect multiplexer which unites high cross-connect capacity and a high number of interfaces in a compact 3 HU sub-rack. XMP1-LCC offers up to 4 x STM-1/4/16, 8 x STM-1/-4, 256 x E1. The integrated TDM cross-connect switches the traffic on SDH level (48 x VC-4, 3024 x VC-12, 144 x VC-3) and E1 level respectively 64 kbps level (8064 x 64 kbps [252 x E1]). When switching on 64 kbps level it can be selected whether CAS signalling is to be forwarded in parallel to the payload in timeslot 16.The supported features, its compact design and the variety of units make XMP1-LCC suitable for a wide range of scenarios. The cross-connect capacity makes it the ideal solution for large network nodes in dedicated networks. It is first choice also for locations where large numbers of incoming 64kbps connections have to be multiplexed or where different technologies (SDH, PDH, 64kbps) have to be transmitted.


  • Compact PDH/SDH multiplexer in a 3 HU sub-rack
  • Cross-connect capacity of up to 8064 x 8064 x 64 kbps
  • Grooming on up to STM-4 level
  • Up to 252 x E1 (252*2Mbps) blocking free cross connect on 64k level
  • Designed for highest availability
  • Fully integrated in the SOX network management
  • Compatibility to XMP1 and XMP1-SL
  • System redundancy (power feeding and switching matrix)
  • Ethernet over PDH (EoPDH) capability
  • Engineering Order Wire (EoW)


The XMP1-LCC is ideal for the following applications and areas

  • PDH and SDH cross-connect
  • Point-to-point and point-to-multipoint networks
  • Standard interfaces for connection to radio, SDH and ATM systems
  • Various redundancy mechanism via safety-relevant transmission networks
  • Consolidation & Grooming
  • Access node for transmission networks

In the access area of mobile networks the XMP1-LCC is designed for grooming and consolidating traffic via 2 Mbps connections. Some application examples of the XMP1-LCC are shown below and include telecommunications networks operated by Public transport companies, (railways, waterways, motorways), Utilities (gas, water, electricity) and Pipeline operators. Other applications include Transmission networks of public network operators, Grooming and consolidation in mobile networks, Applications in security and defence segment (e.g. air traffic control) public services, (police, fire brigade, emergency services).

XMP1-LCC Ethernet Ring Protection diagram

Expandability: Starting with low initial investment XMP1-LCC can be adapted step by step up to its maximum capacity following increasing demand.

Transmission reliability: The optional redundant cross-connect and control unit, decentralised power supply and redundant power feeding lead to a high reliability of 99.999 %. Similar to the other XMP1 systems, the network’s availability can be increased with a variety of protection mechanisms. These are MSP, SNCP (Subnetwork Connection Protection), redundant 2 Mbps lines and 64 kbps channels. These features make XMP1-LCC ideal for the transport of mission-critical data.

System design: The XMP1-LCC basic system consists of a compact 3 HU subrack, power feeding and an integrated connector panel. The connector panel contains the Ethernet interface for the local configuration (F interface), the Ethernet interface for connecting the network management system (Q interface), an interface for Ethernet over PDH transmission (ULAN), the  T3/T4 clock interfaces as well as the alarm interface and input and output contacts (EDI interface).

Equipment: The XMP1-LCC provides 10 slots. Two slots are reserved for the central units and 8 for interface units. The central unit consists of a non-blocking 64 kbps cross-connect (CUL) or two STM-1/4/16 interfaces, a non-blocking VC-4/3/12 and 64 kbps cross-connect (CUS) and the control unit. To increase reliability it is possible to equip the central unit redundantly. Manual switch-over between active and passive central unit for maintenance purpose happens without bit errors. Automatic switch-over time in case of fault <50 ms. The 8 slots for interface units can be equipped with up to three 64 x 2 Mbps port units (Port2M [64]), with up to two 4 x STM-1/4 units (PortSTM [4]) or with up to five 32 x 2Mbps port units (Port2M [32]).

Management: The ServiceOn XMP1 (SOX) network management system fully supports installation, configuration and monitoring of an XMP1 network and the XMP1- LCC. Integrating the XMP1-LCC into the SOX network management facilitates the setup and monitoring of end-to-end connections. SOX-LCT allows necessary local confi guration. Just like XMP1, XMP1-LCC supports the connection to the network management system using the system channel in time slot 0. It is established automatically as soon as the network nodes are connected via 2 Mbps connections.


Number of Slots: 10
Slots for central unit with redundancy: max. 2
Slots for interface units (full width): 3
Slots for interface units (half width): 5

Standards and Recommendations
Supports ITU-T recommendations: G.703, G.704, G.706, G.732, G.796, G.797, G.810, G.811, G.812, G.821, G.823, G.826

System Properties
Cross-connect capacity: Up to 8064 x 8064 64 kbps time-slots (non-blocking). Capacity can be increased step by step (by software key)
Redundancy/protection mechanism: Redundancy of central unit with cross-connect. Redundancy for 64 kbps channel and 2 Mbps line
Clock: Clock Signal Sources: T3 input (9-pin Sub-D connector) and arbitrary E1 signal, clock priorities, configurable network wide

SDH STM-1/STM-4/STM-16 – Aggregate
Bit rates: 155 Mbps, 622 Mbps and 2488 Mbps
Number of ports (per unit): 2 x STM-4/STM-16 (optical) or STM-1 (optical/electrical)
Types of ports: SFP based

SDH STM-1/STM-4 – Tributary
Bit rates: 155 Mbps and 622 Mbps
Number of ports (per unit): 4 x STM-4 (optical) or STM-1 (optical/electrical)
Types of ports: SFP based

EOW Interfaces
Engineering Order Wire: RJ11 socket

E1 Application Interfaces
Number of ports (per unit): 64 or 32
E1 interfaces: E1 interfaces according to ITU-T G.703, G.704
120 Ohms symmetrical or 75 Ohms asymmetrical, max. 6 dB attenuation,
CRC-4 synchronization, 160 pin Molex LFH connector

Ethernet Application Interfaces (Ethernet over PDH)
Ethernet interfaces: HDLC encapsulation, n x 64 kbps bandwidth (1 ≤ n ≤ 32), RJ45 connector

Dimensions (W x D x H) and Weight
XMP1-LCC: 132 mm x 440 mm x 240 mm, 7.5 kg

Power supply
Input voltage nominal (min/max): -48/-60 V DC (-36 V DC ... -75 V DC)
Plug: 3 pin Sub-D connector

SOX (ServiceOn XMP1): For local and central management
Management channel: 64 kbps in-band management channel
DCN connection in time slot 0 (XMP1 system channel)

Operation environment
Operating temperature: -5 °C ... +55 °C
Humidity: According class 3.2, up to 95 %, no condensation


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