Interfacing Serial/Bulk Crypto Equipment

The following shows a requirement to convert Serial EIA530/TTL to OC-3 ATM. The important requirement here was that the Metrodata AP3000 supported exact clock rates from the Satellite Demodulator. These were converted to ATM in the AP3000 and connected to the ATM Switch and into the ATM Network. At the far end of the ATM Network, a second AP3000 was used to reconstruct the exact clock rate to connect into the EIA530/TTL Serial Encrypter.

This is a typical Government System, and Metrodata were the only company that could provide a solution.

The reason for this is that our EIA530/TTL Module for the AP3000 supports Clock Rates in 1Hz increments up to 20Mbits. Satellite Modems and Encrypters in this instance support Serial Data Rates that are also in 1Hz increments. There had to be an exact match between the Data rates.

Other Manufacturers of similar products to the AP3000 only support 8Kbits increments or even worse, specific Clock Rates. This presents a problem when to ensure effective clocking, you need to support the exact rate coming out of the Serial Encrypter.

The Metrodata AP3000 that was used in this application could also have supported HSSI Serial Crypto Equipment, and a wide range of ATM Switch Interfaces - E1, E2, E3, DS-3 and OC-3.

A simple Topology of this Application can be seen below.

Using the Metrodata AP8000, we are also able to multiplex serial connections into a single ATM Trunk. For example, we could multiplex up to 8 Serial Connections on EIA530 or HSSI into E3, DS-3 or OC-3 ATM Switch. This is a very effective method of multiplexing, as our ability to exactly clock the serial connection means that we give you the ability to use your bandwidth on the ATM network more efficiently.