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Megaplex -2100 

Megaplex-2100 and Megaplex 2104 are modular integrated access TDM multiplexers, which integrate multiple dedicated data, voice, ISDN and LAN channels over multiple main (network) links. RAD Megaplex equipped with 8-port main link modules in conjunction with the 12-port high-speed module features a traffic payload capacity of up to 248 DS0 timeslots. The modules of version 11 and lower support up to 124 DS0 timeslots (8 Mbps).

Megaplex 2100 and Megaplex 2104 from RAD

 The flexible, modular RAD Megaplex with a wide choice of I/O (user interface) modules was designed for applications ranging from railroads, power utilities, police and fire departments, small campus networks to multi-site corporate networks or extensive carrier access solutions. Due to Megaplex’s standards adherence, central office based cross-connect units (DACS) can separate voice and data, sending each to the appropriate carrier or service.

Megaplex enables carriers to successfully deploy bundled services, ISDN services and Internet access. The integration of a broad
range of services makes the RAD Megaplex a cost-effective access device, with reduced deployment and maintenance costs. Megaplex with TDMoIP technology provides a cost-effective, versatile and modular solution for transmitting legacy TDM traffic over IP networks. This is especially suitable for large corporations, utilities or power companies that are seeking a gradual migration to IP networks.

The equipment conforms to international standards, ensuring compatibility in multi-vendor environments worldwide. 

TDMoIP with the RAD Megaplex
Megaplex offers an optional IP main link module ( MP-2100M-ML-IP/UTP/1E ) that transmits TDM traffic directly over IP networks. This TDMoIP access module converts user TDM traffic into IP packets transmitted on 10/100BaseT or 100BaseF Ethernet networks thus helping to protect your equipment investment. T1 today, IP tomorrow just by changing the mainlink module.

Megaplex Chassis ( MP-2100 and MP-2104 )
The chassis is available in two basic variants:
Megaplex-2100 (4U high) chassis providing slots for up to 12 main link and I/O modules
Megaplex-2104 (2U high) chassis providing slots for up to 5 main link and I/O modules.

RAD Megaplex 2100 and Megaplex 2104 mux

RAD ( MP-2100 and MP-2104 ) Megaplex timing options
Multiple system timing options are available:

Internal crystal oscillator clock
Clock received from any link (loopback)
Clock from any high speed module channel
External station (master) clock
Adaptive timing received from any bundle (with ML-IP only).

Any clock source can be set as fallback in the event of primary clock source failure.

Megaplex ( MP-2100 and MP-2104 ) redundancy
Megaplex’s modular, distributed architecture enables redundancy at different levels of the network and provides a system with no single point of failure.

System hardware redundancy is attained by an optional redundant power supply and common logic module (MP-2100 chassis only).

1:1 protection switching on the main link modules protects against network or cable failure. Additional ML modules can be installed and interconnected via Y-cables to provide protection against ML hardware failures.

Bundle redundancy provides backup for IP transmissions (functions similarly to E1 / T1 link “parallel TX” redundancy).

In case of link failure, Megaplex activates alternate routing. This is achieved by storing multiple configuration databases and flipping (switching) between them in case of any network event. This can be very important to railroads, power and gas utilities as well as air traffic control and more.

The RAD Megaplex ( MP-2100 and MP-2104 ) system also supports two RAD proprietary types of ring redundancy, provided by its main link modules:

E1 / T1 Ring: Similar to SDH, the E1/T1 ring features ring redundancy in a closed dual-ring topology: one path propagates data “clockwise” and the other “counterclockwise”. Each Megaplex can receive data through two different paths, and selects only the signal received through one of the paths for processing. In case of failure, the failed segment is bypassed by using the second path, providing self-healing in less than five seconds.

RFER: The TDMoIP link module features RAD’s Resilient Fast Ethernet Ring (RFER) technology for creating self-healing Ethernet ring networks. RFER reroutes traffic within 50 msec of a ring segment failure, providing fast redundancy performance similar to SDH networks. Survivability is further enhanced by RFER’s scalable support for multiple rings. RFER can carry up to 40 E1 or 50 T1 links with no limit on the number of nodes.

The built-in, non-blocking, DS0 cross-connect matrix enables routing any channel’s timeslots to any link. This allows Megaplex to maximize its efficiency by splitting voice and data channels and redirecting the traffic, via separate links, to the appropriate service.

The cross-connect matrix also enables routing timeslots from any link to any other link. This facilitates drop insert, bypass or broadcast multi-link applications.
Megaplex-2100 or Megaplex-2104 in a point to point topology
A total of 124 timeslots can be allocated, either for transmission of I/O channels or for bypassing timeslots between links of different modules. 

R2 Signaling Supported with the Megaplex Mainlinks
Main Link (ML) modules support R2 signaling with transparent MFC/DECADIC, so that Megaplex can be placed between an older R2-PBX and a digital (E1-CAS) PBX. The MFC/DECADIC signaling is not terminated by Megaplex, but passed on to the PBX. In addition to the ITU-T standard R2 protocol, several predefined national PTT protocols, as well as user-defined variations, are also supported. Since the R2 signaling support is provided by the ML, all voice module types support R2.

Megaplex ( MP-2100 and MP-2104 ) Common Logic Modules

The Common Logic (CL) module controls the Megaplex operation and is the interface for its configuration and management. It stores the application software and up to 10 configuration databases (depending on complexity) for multiple independent configurations. The CL also stores all system event information. Flash EPROM for software download is provided.

Two dedicated ports are provided on the CL module for management purposes. One port has a 9-pin DCE interface for direct connection of a management terminal or PC. The other is ordered with one of the following interface options:

Ethernet 10BaseT (UTP)
Ethernet 10Base2 (BNC)
• V.24/RS-232 DTE.

An input voltage detector, intended for sensing external events (coming from temperature alarm sensors etc), generates internal alarms, which are sent to the NMS station and reported to the user. Two outbound relays can be assigned to be triggered by any user-selected major or minor alarm, for routing of Megaplex alarms to outside indicators, such as buzzers and bells.


Megaplex TDM E1 / T1 main link modules allow direct connection to a wide range of services, eliminating the need for external equipment. Multiple active links can operate in each chassis. Additional modules can also be installed for link redundancy.

The various ML modules can be configured for a broad range of applications: from single link non-redundant operation, to multiple full or fractional E1 / T1 link applications requiring drop & insert and broadcast.

E1 / T1 link modules with built-in fiber optic modems (range up to 100 km/62 miles) or E1 link modules with xDSL modems (range up to 10.6 km/6.6 miles) are available. These special links reduce the cost of local loop solutions by lowering equipment deployment and maintenance costs. 

The dual-trunk main link modules increase efficiency and provide 1:1 protective switching between the two links within 50 msec.

The high-density 8-port E1, T1 and SHDSL modules increase the Megaplex TDM capacity up to 16 Mbps. 

The unique ML-IP main link module converts the TDM bit stream delivered over the internal Megaplex back plane into IP packets, for transmission over IP networks. ML-IP features three Ethernet ports, with 10/100BaseT or 100BaseF interfaces. The module conforms to IEEE 802.3 and 802.3u and provides reliable, high quality of service (QoS), including VLAN tagging and priority labeling (ToS). ML-IP places TDM  imeslots into IP bundles with VLAN tagging required by point-to-multipoint applications. Duplicate bundles can be transmitted simultaneously on different paths for redundancy.

Megaplex-2100 in  a Tetra Ring

RAD MEGAPLEX ( MP-2100 and MP-2104 ) I/O MODULES

Up to 11 I/O modules of any kind can be placed in an MP-2100 chassis (up to 4 I/O modules in an MP-2104). If more I/O modules are required, Megaplex 2100 and 2104 units can be cascaded.

High-Speed Data Modules
Megaplex ( MP-2100 and MP-2104 ) High speed data interface modules provide leased line data services, operating at multiples of 56 or 64 kbps, up to 2.048 Mbps, connecting routers, bridges, front-end processors, etc.

E1 interface modules with built-in xDSL modems enable cost-effective long-range deployment of high speed services over 2- or 4-wire copper lines. Range is up to 4.0 km.

ISDN BRI (“U” or “S”) modules extend ISDN services over non-ISDN facilities, supporting data, voice and Ethernet applications. The “U” interface modules employ IDSL technology for “last mile” applications.

An IEEE C37.94-compliant n x 64 fiber data module is provided for transporting teleprotection data.

Low Speed Data Modules of the RAD Megaplex, MP-2100 and MP-2104 
Sub-rate multiplexer modules for low speed (2.4 to 19.2 kbps) synchronous and asynchronous data channels employ standard X.50, X.58 or SDM (DS0-B) multiplexing techniques. 

Low-speed modules with sync/async V.24/RS-232 channels, with independent channel rates of up to 64 kbps are available. End-to-end control signals are supported.

Megaplex Voice/Fax and Voice Compression Modules
Voice/fax modules transmit voice at toll quality using standard PCM (ITU-T G.711), as well as ADPCM (G.726), MPMLQ (G.723.1), or P-CELP 4.8 kbps compression. Standard analog interfaces are available for direct connection to POTS, public payphones, LB (local battery) field phones, PBX extensions or 2/4-wire E&M trunks. Alternatively, voice compression modules with E1 and T1 digital PBX interfaces are available. Loop, wink and ground-start signaling are also supported.

Digital voice compression modules connect PBX trunks with greater bandwidth utilization (compression ratio of up to 10:1). The modules employ  a choice of high quality voice compression methods, including G.723.1 at 6.4 kbpsper channel, or G.729A at 8 kbps. The modules support Group III fax and modem relay, at user-selectable standard rates of up to 14.4 kbps, featuring transparent timeslot transfer, voice activity detection,
silence suppression, and comfort noise generation. Module versions are offered with single/dual T1 (up to 24/48 channels), or single/dual E1 (up to 30/60 channels) interfaces.

A special ”omnibus“ module provides four toll-quality voice channels to support applications (see Figure 4) where a master site needs to communicate with multiple remote stations simultaneously (such as to broadcast an important message).

VC-16 module

LAN Modules of the RAD Megaplex
Ethernet router/bridge modules enable LAN to LAN extension over E1/T1 services, offering various L2 capabilities.

RAD Megaplex, MP-2100 and MP-2104 MANAGEMENT
Megaplex can be fully configured locally, using an ASCII terminal. It can also be managed remotely via Telnet, SNMP element management applications, or end-to-end path management application. 

Megaplex communicates with the management station by means of its SNMP agent (via a SLIP/PPP or TCP/IP connection). Network management applications provide centralized control of all network nodes, including interface configuration, connection setup, alarms and monitoring.
GUI-based RADview network management
The user-friendly GUI-based RADview network management applications facilitate management of both individual units and entire networks.
The RADview-SC/TDM application enables end-to-end path management of MAP devices, providing physical and logical graphic views of all network links and service paths of the system.

The management connection can be established by the following methods:
• Out-of-band, using the Ethernet management port. This simple and efficient method takes advantage of IP bandwidth on demand, while saving link bandwidth for user traffic
• Inband over a dedicated timeslot, supporting standard PPP, FR encapsulation, and RIP2 protocols
• Over a modem link or over a FRAD, via the control port of the remote unit.

Megaplex incorporates test features for rapid fault detection and easy maintenance. Upon power-up, all system and modules perform self-test. Any
problems are reported to the management system. Loopbacks, BERTs and tone injections can be run on individual channels or main links, towards both the network and user side.

The signaling monitoring capability useful for voice application diagnostics enables RAD Megaplex to display a “snapshot“ of the current ABCD signaling bit states of any selected timeslot that carries voice traffic.

All alarms, including state and frequency of occurrence, are stored in CL’s alarm status buffer. Last 256 alarms are kept in a separate alarm history buffer.

Alarm status can be automatically read online by the management system from any node. User-set alarm masking, filtering and inversion, as well as 5-level prioritization are also supported.

Megaplex-2100 is also offered in a special NEBS-compliant version which meets the Type-3 and Type-4 requirements, and permits reliable operation in harsher environmental conditions.

Contact your RAD distributor for more information on NEBS-compliant equipment.

NEBS Compliant Megaplex-2100 chassis

Megaplex-2100 and Megaplex-2104 product data sheet (pdf)

Immediate price quote - Call 727-398-5252 or e-mail cs@bestdatasource.com

Don't forget to ask about  RADCare support for your RAD products.

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Last modified: January 30, 2021
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