Here a short excerpt from their press release:

One of the key differences between Meinberg devices and their competition is that most products – including the new M400 – are built-to-order and will be individually configured and produced based on the end customers requirements. The type and number of different outputs, up to 6 different oscillator options for different stability and holdover requirements as well as the exact length of the RG58 antenna cable (up to 350m without requiring any amplification or other active components) or the Meinberg fiber optic antenna systems can be selected for each single device. That means: Individual, customized hardware with a minimum order quantity of 1 (one).

As all Meinberg LANTIME products, the M400 comes with a 3-year warranty (can be extended to 5 years) and free lifetime support (via telephone and E-Mail) as well as free firmware updates.

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Normal L1 Antenna

If the receiver uses a normal L1 antenna, the frequency that has to be transmitted over the cable is the full
1.575 GHz and due to this very high frequency the length of the cable is very limited. Usually it is about 20 meter and can only increased by using expensive special low loss cable.

Receiver in the Antenna

This is an approach that several manufacturers like Galleon are trying. The receiver is in the antenna, and time information is transported via RS-422 or a similar protocol to the device. Due to the differential signal of RS-422 or RS-485 the cable can be much longer. The big disadvantage of this technique is that the receiver is inside the antenna and is influenced by all weather conditions like sun, ice or snow.
The precision of the timing signal will vary with the fluctuations of the temperature.

Up/Down Converted GPS signal

This is the technique, the guys at Meinberg are using, and it seems to be the best approach, because you can use standard RG58 coaxial cable up to 300 meter, and with RG213 even up to 600 meter.
And the receiver and the high-precision oscillator are in a regulated environment.

MSF Time and Date Code

The MSF signal transmits time and date information in a  binary-coded decimal format by on-off modulation of the carrier. The whole code is transmitted each minute, with 2 data bits every second of the minute except the first.

Here a few links to MSF radio clocks and MSF Time Servers:

MSF Antenna

MSF USB Clock

MSF Network Time Server

The Inter-Range Instrumentation Group (IRIG) time server is an important technology providing accurate network time synchronization. Time-critical operations – militaries, hospitals and financial services – depend on the highly precise data time stamps.

The Network Time Protocol (NTP) is a technological agreement establishing a common standard for synchronizing clocks, time and data based on the Universal Time Coordinated (UTC), which is calculated by the Greenwich, England Observatory Clock. These universal time stamp standards ensure that computer data transmission is organized in proper sequences.

Most computer clocks are inaccurate. They are set, by estimation, to within a couple of minutes of local time. The backup electrical currents are not always reliable. If the computer malfunctions, the clock could lose time. Some computer clocks only “run” when the computer is “on”. The IRIG time server overcomes individual computer inaccuracy.

An IRIG time server establishes time synchronization and network accuracy using the more precise format of year, day, hour, minute, second, microsecond and millisecond coordinating with the UTC. Time synchronization gains importance for file organization as data flows in from many different sources.

While some firms may go onto the Internet for network time synchronization, this can cause a security risk by going outside the company “firewall”. This procedure is also less accurate due to data transmission time delays.

Installing an IRIG time server within your firewall, can protect your network’s security and ensure more accurate time stamps. The “most accurate time gives a company an advantage over its competition.”

MSF Time Server

Here is a link to the MSF Website.

It is delivered with a MSF outdoor antenna that can be connected with standard coaxial cable with up to 300m length.

Here is a picture of a GPS Time server with antenna and all needed parts:

The name of this model is Lantime M100 and it comes with a GPS timing receiver, antenna, and 20 m of cable but without display and for DIN rail mount, because of that i think it is mainly for industrial environments, like substations or similar. Here is a picture from the Meinberg website:

Here is an example for a Rail Mount NTP Server