4-Wire Interface with Call Signal, Matrix-to-Party-line. The EF-701M interface connects one channel of standard or TW party-line intercom to four-wire audio, and simultaneously converts either the DC-voltage call signal or 20kHz call signal to RS-422 data (and back). The resulting four-wire audio plus RS-422 data can then be sent to a fiber-optic converter (modem) or transmitted over twisted-pair cable such as CAT-5. Excellent stand-alone two-to-four-wire converter and hybrid null and wide-range level controls. Easily mounted on a utility rack shelf; up to three units will fit across a standard 1-RU rack space. No additional power connection is required, as the EF-701M is powered by the intercom line.
Fast shipping and professional packing
Because of our long-standing relationship with UPS FedEx DHL, and other major global carriers, we are able provide various shipping options. Our warehouse personnel will pack each item according to our strict specifications. Prior to shipping the goods are thoroughly inspected and secured. Every day we ship hundreds of packages to our customers across many countries. The fact that we're dedicated to becoming the largest online retailer in the world is evident. The warehouses and centers of distribution are in Europe and the USA.
Note that orders containing more than one item are processed according to the particular item.
We will inspect each and every one of the products before they are shipped. Today, the majority orders will be shipped within 48 hours. The delivery time will be between 3-7 working days.
Returns
The stock market is always changing. It's not entirely managed by us, since we are involved with multiple organizations, such as the factory and the storage. The actual levels of stock can change at any time. Please understand it may happen that your order is out of stock when the order has been placed.
Our policy runs for a period of 30 days. However, if the 30 days have elapsed from the date you purchased the product, we are unable to give you a refund or exchange.
For your item to be eligible for return, it must be unopened and in the condition you received it in. It should also be in the original packaging.
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