VCL-1400, STM-16 / 64 SDH Multiplexer


The VCL-1400 is an ultra-compact, carrier class, and cost effective family of micro packet optical Equipment (micro POTP) designed to manage and deliver services from the optical core to the access. The VCL-1400 can be configured as a Terminal Multiplexer (TMUX), Add-Drop Multiplexer (ADM) and In-Line Amplifier or as stand-alone Cross-Connect for SDH applications, as well as for Packet and Packet Aggregation applications.

VCL-1400, STM-1/4/16/64 and GE/10GE platform, has been envisaged to address the growing demand for an ultra-compact STM-1/4/16 /64 Add-drop Multiplexer (ADM) , GE and 10GE CPE and aggregation and provide Ethernet-over-SDH mapping and layer 2 switching functions, including Link Capacity Adjustment Scheme (LCAS) with Virtual Concatenation (VCAT).

Data Sheet (PDF)

VCL-1400 supports STM-1/4/16/64 aggregate interfaces, E1 interface cards, E3/DS3 and Ethernet/Fast Ethernet/Gigabit Ethernet and 10 Gigabit Ethernet interfaces. It can be configured in linear, ring and bus topologies.


  • POTP Evolution: SDH, OTN & Ethernet Based line Interfaces
  • High Capacity Micro POTP: 1U to 4U
  • Packet Switching: High Capacity ranging from 2.5G, 5G, 10G, 15G, 20G and 60G Packet Fabric
  • MPLS-TP: Traffic Engineered Pseudowire
  • 50ms Protection on packet: ELPS, ERPS
  • Packet Synchronization: SyncE, 1588v2
  • Circuit Emulation: TDM over Packet
  • TDM Switching: High capacity 60G LO Fabric for efficient transport of SDH & PDH

Key Benefits

POTP Evolution: VCL-1400 can seamlessly transition from 100% TDM to 100% Packet Box. It can be deployed as a TDM MSPP in SDH networks and can transport data traffic using GFP and LCAS.

On the other hand it can be configured as a Packet Switch and deployed in Ethernet based networks. It can offer TDM services on these networks through circuit emulation.

VCL-1400 can be deployed at gateway locations between TDM & Packet Networks and can help a network operators transition their services slowly from TDM based to packet based.

Flexibility: Every operator and it's network has it's own needs and requirements. VCL-1400 with it's modular architecture provides one platform which can fit into a variety of needs. This also enables a pay as you grow model. Base chassis variants of 1U (3 slot) and 2U (7 slot) along with an expansion chassis are available. A variety of line cards for both TDM and Packet help the operator arrive at the most optimal configuration for a particular requirement.

MPLS-TP: Label Switched Paths with MPLS-TP is becoming an important requirement for scaling the network for millions of subscribers and thousands of services today. VCL-1400 provides MPLS-TP based pseudowires for traffic enginered traffic flows on trunks, which leads to better control over the packet traffic resulting in a more optimized network. This is key to lowering capex in today's cost competitive environments. MPLS-TP is also an enabler for path level protection and restoration on the network. VCL-1400 also supports end-toend sub-50ms path level protection by supporting ITU-T G.8031 standard on MPLS-TP tunnels.

Advanced Ethernet Features: VCL-1400 has best in class packet switching capabilities, in line with today's requirements. Ingress rate limiting ensures that every packet entering the network is within the SLA bounds agreed with the customer. This prevents one customer from congesting/choking the packet network. Each packet is classified, so that the appropriate network policies (like prioritization and scheduling) can be applied to each kind of traffic. Options for 8 CoS queues and scheduling algorithms ensure that there are sufficient options available to the network administrator to manage the data traffic efficiently. ERPS (Ethernet Ring Protection Switching) standardized by G.8032 provides 50ms protected packet rings for greater resiliency. Multiple ringlets can be configured, and multiple ring topologies of packet networks are supported.

Packet Synchronization: VCL-1400 also support SyncE and 1588v2 for distribution of Synchronization information over pure packet networks. This is critical for deployment in mobile networks especially for LTE, where voice is packetized but synchronization is critical for cell handoff and for ensuring jitter-free voice calls.

Circuit Emulation: As networks move from TDM towards packet, a few TDM circuits are expected to be required for a long time due to legacy reasons. It's not cost effective to maintain an entire TDM network for this small amount of traffic. VCL-1400 supports SAToP and CESoPSN for carrying this TDM traffic over a pure packet infrastructure.

3 Slot Chassis

The 3 slot chassis supports 3 fabric + traffic slots. One or two slots can be used for the TDM cross connect. A few SDH aggregate ports are available on the cross connect card itself. More STM1/4 tribs or E1, E3/DS3 or Ethernet cards can be jacked into the 3rd slot. In case redundancy is not required, the second slot is also available for tributary cards. If more interface density is required, the expansion chassis can be plugged in, which will give 5 additional slots. In addition to the 3 traffic slots, there are two dedicated slots for redundant power supplies.

For Pure Packet operation, the VCL-1400 can be populated with the centralized Packet Fabric. This card supports few 10GigE and GigE Interfaces. For dropping more Ethernet interfaces or for TDM (Circuit Emulation) the appropriate line card can be populated in the 3rd slot.

The 3 slot chassis is suitable for deployment as a CPE box or as an ADM element for building last mile aggregation rings The GigE client interfaces can be connected to 3G/LTE base stations, DSLAMs or Enterprise Routers to give high speed data services. The integration of OAM functionality into the FTU helps save a slot and enables supporting more traffic carrying interfaces on the common cards.

7 Slot Chassis

As the name implies, the 7 slot chassis offers 7 traffic slots in addition to the two redundant power supplies. Two of the slots can be used for the integrated fabric + aggregates + tributary interfaces, while the other 5 slots are used for tributary drops. Plugging in the expansion chassis gives another 5 slots, thus giving a total of 10 slots apart from the XC + Aggregate slots.

The 7 slot chassis can be used to aggregate second level aggregation rings.

Expansion Chassis

The expansion chassis is a pluggable 3U chassis that can be jacked on top of a VCL-1400 3 slot or a VCL-1400 7 slot chassis. It provides 5 tributary slots and 4 IO panels for PDH protection. The expansion chassis supports slots for putting redundant power supplies. If the number of cards is less, or lighter power consumption cards are populated, the expansion chassis can draw power from the man chassis itself.

The VCL-1400 with it's multiple base chassis variants, expansion chassis, a choice of cross connect and packet fabrics and the sophisticated packet features meets all the expectations for a next generation POTP platform. It provides a build as you grow model, where the operator can start with a compact 1U 3 slot chassis, and expand using either the expansion chassis or replacing the node by a 7 slot chassis. In migrating from a 3 slot chassis to 7 slot chassis, only the chassis needs to be changed and all the cards including the commons are reusable. VCL-1400 is truly a best in class micro-POTP platform.

Protection / Redundancy

  • Protection Switching: Equipment protection switching accommodates various hardware failures while the transport facility is still functional. In an event of hardware failure, the hardware is substituted without affecting the traffic.
  • Cross-connect Card Redundancy: The VCL-1400 facilitates cross-connect redundancy by having cross-connect cards in slots 4 and 5. Software on each cross-connect card decides which cross-connect card is the active controller. The active cross-connect card takes control of all the processor bus signals on the backplane. The processor bus is shared across all the tributary cards. All the traffic related devices on each cross-connect card is always under the control of the active cross-connect card.
  • Power Supply Redundancy: The system has two power supplies to facilitate power supply redundancy. The output of both the power supplies are shorted together on the backplane and then in turn given to all the cards.
  • 1+1 MSP: 1+1 MSP is available only in the TMUX configuration. Protection switching is software controlled and the cross-connect card provides all the alarms for the switching to be initiated. Both revertive and non-revertive modes of MSP are supported and the Wait-to-Restore (WTR) time is configurable. Path level protection is also available in the 1+1 MSP scenario.
  • Sub-Network Connection Protection (SNCP): Sub Network Protection Path is a path protection switching and is supported for the VC-4, VC-3 and the VC-12 container levels. The receiving network element monitors the virtual containers (VCs) from different paths. The VC with better performance is selected for de-mapping. The SNCP protection is initiated in the occurrence of Signal Fail (SF) or Signal Degradation (SD) condition.
  • Tributary Protection Switching: Tributary protection switching is available in the ADM configuration. This is a VC-12/VC-3 path level protection scheme that uses the broadcast feature of the cross-connect fabric. Protection switching is software controlled and the XCC provides all the alarms for the switching to be initiated.
  • Timing Reference Switching: A timing reference for the equipment is selected from a pool of available references. When a failure occurs on the selected reference (Alarms, Frequency Out-of-Range), the timing reference is switched to the next available reference after going to holdover momentarily. Timing reference switching is software controlled and the cross-connect card provides all the alarms for the switching to be initiated.
  • LCAS Protection: Link Capacity Adjustment Scheme or LCAS is a method to dynamically increase or decrease the bandwidth of virtual concatenated containers. The VCL-1400 supports LCAS as per the G.7042 specifications. LCAS is implemented using the overhead byte reserved for transmitting control information in a VCG to dynamically adjust the number of VCs in the VCG as per the bandwidth availability. Thus, the VCL-1400 can dynamically adjust the bandwidth according to the service bandwidth availability in a hitless manner.
  • ERPS Protection: Ethernet Ring Protection Switching, or ERPS, was developed by ITU-T in order to provide sub-50ms protection and recovery switching for Ethernet traffic in a ring topology, and at the same time ensure that there are no loops formed at the Ethernet layer.

Application Diagrams

VCL-1400, STM-16 / 64 SDH Multiplexer

Data Sheet

Data Sheet (PDF)