Datacom
DM16E1 – DM4E1 Series. Optical PDH Multiplexer.
DM16E1 – DM4E1 Series
Optical PDH Multiplexer

The DM16E1 Series II e DM4E1 Series II family presents PDH multiplexers in conformity with G.751 and G.742 standards. They are Physically comprised of a basic unit for 19” 1.5U-high rack assembly and multiplexes E1 channels, Ethernet, V.11 and E3 in optical or electrical 34M beams.

Characteristics
  • Mixed-ring operations with DM16E1 Series II and DM4E1 Series II, sharing the same E3 link, reducing costs in the centralized and distributed system implementation.
  • Flexible tributary mapping allowing configuring tributaries in any E3 aggregate position.
  • Optional VLAN-compatible Ethernet Remote Bridge 10/100BaseT interface, which allows the equipment to be used as end-to-end Inverse Multiplexer, for ring operation or E1 (G.703) interface outputs.
  • Optional internal electric E3 interface, which allows the redundant transmission of an electric E3 link in optical aggregates (optical modem) or the input of a ring electric E3 comprised of the DM16E1 or DM4E1 equipment.
  • Internal router with two WAN interfaces (WAN1:DMLAN, WAN2:PPP/Frame Relay) and one Ethernet (10BaseT) allowing SNMP management or remote software upgrade, in addition to IP address to equipment from other manufacturers.
  • Service channel through a regular telephone (optional).
  • SNMP or VT100 terminal remote management, allowing for the configuration, status verification and test activation.
  • Aggregates with bidirectional fibre, which optimizes the use of the installed fibres.
  • Quick configuration menu for key SNMP management parameters in just one screen.
  • Optional aggregate link backup, allowing hot swap. Features two aggregate slots, which allow it to be used with or without redundancy, depending on the application.
  • Automatic laser turnoff when the aggregate is in LOS, increasing safety for the installation and maintenance of optical links.
  • Redundant power supply with a secondary power supply unit (FAL). Supports hot swap. The FAL model is the same for both AC and DC power supply.
  • Generation of alarms selectable per ports. Features three external alarm inputs and an alarm output with NA/NF contact.
  • Test loops activated locally or remotely. BERT for the V.11 interface.
  • Indication LEDs for the aggregate status, E1 tributary status. Power supply, Ethernet link, service channel, equipment test or alarm.
Applications

Point to Point Topology

The equipment leaves the factory configured for this topology, not requiring any type of configuration is used only when the tax E1 (G.703). The aggregate 1 will be considered as the main link and a link aggregate 2 backup, automatic backup.

 

Point to Point Topology

 

On the Inverse Multiplexing mode, Bridge port is able to split the data received E1 channels.

 

 

Inverse Multiplexing Topology

 

When in Inverse Multiplexing, some E1’s go through different paths (eg SDH or satellite). Thus the DM16E1 Series II and Series II DM4E1 implement greater tolerance for differences in clocks between the E1 tributaries and also for aggregate E3.

 

Point to Point Bridge 100M Topology

Functions as an optical multiplexer that operates at a rate of 155Mbit/s (when using the proprietary protocol). The Bridge interface may use a dedicated channel of up to 100Mbit/s (when using the proprietary protocol). It is made available up to 16 TDM channels for communication (G.703, V.11 or Router for a dedicated management). Still, you can use both interfaces for optical aggregate to ensure redundancy (Operation Main and Backup).

 

 

Point to Point Bridge 100M Topology

 

Ring Topology

The cross and regular rings are built bidirectionally (east ring, west ring) like SDH systems: one ring is used for main data link and the other is reserved for use in case of failure. It can be choused any type of aggregate connection between two adjacent equipments in ring (electrical or singlemode/multimode optical). In the cross ring is needed to install two aggregate cards in each equipment. Besides this topology has the advantage of allow the use of single fiber connections in the ring; single fiber optical installation is cheaper and easy. In this topology the aggregate cards may be swapped without breaking the data link. The regular ring may operate with one or two aggregate cards in each equipment. Even if backup is used in this topology the data link is lost in absence of main link aggregate.

 

Ring Topology

 

Line Topology

This topology works like a broken cross ring: all line network equipments use two aggregate cards and the line terminal equipments use one aggregate card. Line topology don’t have backup and the entire link is lost if a single aggregate connection is down.

 

Line Topology

 

Regenerator Topology

In this topology the equipment act as an optical regenerator, without extract or add any tributary data in the aggregate.

 

Regenerator Topology

 

Optical Modem and Interface Converter Topology

The Interface converter is used to convert E3 framed/unframed interfaces. If backup protection is needed in optical side it can be done using the optical modem topologies. In this case both aggregates use optical cards while the electrical E3 G.703 interface is provided by an additional internal E3 card (DM16E1 Series II-E3Ei), positioned in the Ethernet bridge position. The internal electrical E3 interface uses tributary 01 connection. Transparent Optical Modem topology offers interoperability with another supplier’s equipment in E3 electrical interface allowing unframed E3 rate operation; regenerator and transparent interface converters features optical compatibility too.

As topologias modem ótico transparente, regenerador e conversor de interface transparente permitem interoperabilidade com interfaces ópticas a 34Mbit/s de outros fabricantes com ou sem a estrutura de frame.

 

Conversor Topology

 

Conversor Topology with Protection

 

Ring Optical Modem

Ring optical modem topologies can receive external E3 electrical data to be distributed along the ring. It allows framed electrical E3 (containing framed E2) signals from any source.

 

Ring Optical Modem Topology