Comtech EF Data MM-200 High Speed Terrestrial Microwave Modem

MM-200 High Speed Terrestrial Microwave Modem

This product has been designated as a legacy product by the manufacturer.  Please contact us for info on availability.

The Comtech Radyne MM-200 High Speed Terrestrial Microwave Modem provides an internal one to four channel internal multiplexer as well as up to Four User-Selectable Data/Overhead Interfaces. 

The MM-200 Terrestrial Microwave Modem is an innovative and highly flexible platform configurable for data rates between 1 and 175 Mbps. The unit allows complete control over modulation density and channel bandwidth for efficiencies up to 5.3 Bps/Hz. The unique architecture of the 200 series IF-band allows large improvements to fading and multipath via multiple digital equalizers.

Features

• Internal one to four channel multiplexer
• Up to four user-selectable data/overhead interfaces
• Data rates From 1 to 175 Mbps (200 Mbps optional)
• 4, 16, 32, 64, and 128-QAM (256-QAM optional)
• Diversity option
• Ideal for OEM, new microwave links, upgrades or retrofit
• High resistance to fading
• Wayside and/or overhead options

Benefits

The MM-200 is an ideal solution for both new and retrofit microwave link installations. Maximum flexibility is achieved by an internal data multiplexer that combines up to four user-selectable data paths into a single data stream. Interface choices for each include OC-3 optical, DS3, E3, STS-1, STM-1, SMPTE 310M, DVB ASI, DVB SPI, 10Base-T, E2, overhead and T1/E1(Wayside).

The IF can be configured with one to four channels providing total flexibility. Each channel can operate up to 7 Mbaud. The 2 RU chassis can be configured for simplex or duplex. Two receivers can be connected with the internal diversity option to further increase performance through Space or Frequency Diversity.

Reliability

The MM-200 modem is rich with features designed to maximize the integrity of your data service. Redundant switching is available through a series of redundancy switches. The Reed-Solomon decoder provides superior error correction while the adaptive equalizers provide superior protection from frequency selective fading and multipath.

Optional space diversity switching can provide higher than normal protection by way of using an optional hitless switch to the redundant path before data errors occur.

Additional features include the choice of remotely interfacing through one of three onboard connections: Ethernet (SNMP), RS-485 or an externally-controlled RS-232 terminal. The front panel offers push-button control of all features and a backlit LCD display.

BER Specification

C/N required for an interface BER of 1 x 10-9 at 7 Msps, single IF channel

QAM4 12.5 dB

QAM16 20.2 dB

QAM32 23.3 dB

QAM64 27.3 dB

QAM128 31.0 dB

Options

48 VDC

24 VDC

Simplex configuration, modulator only

Simplex configuration, demodulator only

Space diversity, demodulator only

Additional Mod IF channels, Up To 4 per chassis

Additional Demod IF Channels, Up To 4 per chassis

Optional Data Interfaces

G.703 T3, E3 or STS-1

G.703 E2

DVB ASI (normal or advanced)

DVB SPI, M2P

OC-3 Optical, STM1/ STS3 electrical

10Base-T

Other interfaces available upon request

Orderwire - Can be configured for 8 DS0s or 7 DS0s plus one audio

Note: Up to 4 interfaces per chassis. Any combination can be installed and operated by front panel control.

Calculating 3 dB Bandwidth of MM200 Modulated Carrier

1. Find combined interface data rate:

DRC = Interface 1 Data Rate + Interface 2 Data Rate + Interface 3 Data Rate + Interface 4 Data Rate.

2. Find Total Data Rate plus R/S and mux overhead: DRT =DRC x (204/184).

3. Find Channel Baud Rate: BRC= DRT / (QAM X NC): Where NC = number of channels (one to four) and QAM =

2 for 4-QAM

4 for 16-QAM

5 for 32-QAM

6 for 64-QAM

7 for 128-QAM

8 for 256-QAM

4. Select Channel Spacing: CS = from 1.15 to 1.4 times channel baud rate.  This number is normally 1.25 but can be set to any number between 1.15 and 1.4.

5. Total 3 dB bandwidth = BRC x CS x (NC – 1) + BRC.