|
Digital Pair Gain
Digital Pair Gain is a perfect solution to expand up to 12 times of the existing lines between subscribers and switching system over only one twisted pair.
A subscriber line is also called a subscriber loop, which can be used as a digital transmission line. The philosophy of MPG+ series is to derive the advantage of the transmission technology of SHDSL. By applying Echo Canceller & Hybrid Method and full-duplexing transmission, SHDSL transmission technique becomes practical through a twisted subscriber loop. The coding algorithm of this system is TC PAM. Applying SHDSL technology, but this system got different transmission rate for different model (MPG+ 4, MPG+ 8, and MPG+ 12), so this system is allocated as SHDSL Digital Pair Gain System as well as MDSL Digital Pair Gain System.
MPG+ Series (MPG+ 4/8/12)
The MPG+ series are mainly used to meet the demand of subscribers at those areas, where the number of subscriber lines cannot be expanded in proportion to the increase of subscribers. This system applies SHDSL technology to provide 4, 8 or 12 clear channels (64 Kbps) over a physical twisted pair of wires.
The MPG+ series comprise COT and RT. A Shelf, conforms globally to 19-inch rack at CO (central office), can accommodate 16 LUs (Line Unit).
RT includes a remote unit and a plastic box, which can be installed indoors or outdoors, and either on the wall or pole.
COT Equipment
COT equipment includes a Shelf frame (Sub-rack) and some LU cards. The Shelf frame could be Rear Access or Front Access. Both of them can accommodate up to 16 LUs, and could be mounted on 19-inch rack. The main function of LU is to provide a VF interface for switching system, encode/decode voice signal to digital signal and provide SHDSL interface for digital signal.
Remote Equipment
The Remote Equipment is normally named as the RT (Remote Terminal). The RT comprises an RU board and a waterproof and anti-ultraviolet RT box. It provides the subscriber with a ringing signal generator, an on-hook or off-hook detector, power output (≧45VDC) to telephone set and billing signals for payphone (option).
Just like the LU, the RT also provides subscribers with the SHDSL interface of digital circuit, voice signal encoding/decoding and transforms the power fed from COT to meet the requirement of RT and subscriber telephone sets.
Features
¨ High speed in transmission when Modem (Internet) or FAX connected
¨ Excellent transmitted voice quality
¨ Various metering functions for pay-phone are available
¨ Remote power feeding for Remote Unit
¨ Different channels units could be installed in the same Shelf
¨ Short, surge and lightning protections comply to ITU K-20 and K-21
Applications
1. Increasing to 4/8/12 subscribers with a telephone line pair
2. 4/8/12 independent POTS interfaces are available
3. Both DTMF and dial pulse are available
4. Flexible channels to be added
