Appointment of concentrator: dynamic formation of one outgoing E1/T1 from 4 entering. Formation of the outgoing stream occurs by means of a choice from 4 entering busy time slots (TS) and their placing in free outgoing intervals. The outgoing stream of one half kit of the concentrator is transmitted with transmission equipment to another half kit. The received TS investigated and placed in the appropriate intervals of 4 entering streams. So, the work of 120 subscribers in 30 "connecting" channels is provided. 31-st subscriber receives a busy signal.
        Concentrator is intended for increasing of economic effectivness of carrying out of subscriber capacity from the digital automatic telephone exchanges having ports E1/T1 with signal system 1CAS to removed subscribers with the help of transmission equipment E1/T1 model MK-30TC10 and terminal multiplexers KM-6A/30 (or analog equipment of other manufacturers).
        MK-5/4 - is the main unit of subscriber concentrator model IKM-6A/120 "uniting" four initial multiplexers IKM-6A/30 on the station and subscriber side.

In rural networks it provides transmission on section CO - RO:

• At presence of copper twisted pairs of cable with S = 0,9 mm2-120 "direct" numbers on each pair.
• On RRL, formed by RRS R-6 - 120 "direct" numbers.

This opportunity will allow (especially with substitution of analog automatic telephone exchange on digital ):

• To exclude the necessity of application in villages the remote automatic telephone exchange with number capacity less than 240 No.N;
• To unify a configuration of regional digital automatic telephone exchanges, using E1/T1 ports as the subscriber's equipment ;
• To unify schematic of a local rural network in a radial type;
• To liberate one copper twisted pair of cable with S = 0,9 mm2 for Internet traffic transmission.
• Is used effectively with cable capacity in settlements with low population density, placing 4 pieces on 30 channels of subscriber half kit in different places of settlement.

If necessary the transmission into rural settlement to which we have the cable with S=1õ4õ0,9 of the integral service and total needed number capacity no more than 140 subscribers, IKM-6A/120 and one universal MC-115T allow to transmit on two pairs of cable 144 subscriber's numbers and Internet 384 kbps stream. Networking transmission schematic of 144 subscriber numbers and channel Internet 384 kbpts on two pairs. In case if regional automatic telephone exchange is analog, the formation of digital Å1/T1 streams on its side can carry out half kit of equipment model IKM-6A/30. At the subsequent substitution of automatic telephone exchanges on digital pointed half kits are excluded from schematic and can be applied further as terminal (with substitution of payments of the low-frequency terminations).
Characteristics of entering streams - at G.703
Characteristics of outgoing stream - at G.703

Cost of MK-5/4 - 3 200 $ USD

Example 1 illustrates increasing length of regeneration section

Example 2 Illustrates possibility of carrying out 60 direct subscribers at one pair in cable 1x4x0,9 at distance up to 30 km with one regenerator and load 0,25 Erlang.

Example 3 Illustrates increasing length of radio relay line at decreasing of group transmission rate 2 Mbps up to 512 kbps at other equal conditions. Circuit is more efficient at impossibility of direct radio visibility provision.

Example 4 Illustrates possibility of carrying out 120 subscribers (with load 0,2 Erlang and stream Ethernet 384 kbps at radio relay line with group rate 2 Mbps. Such circuit of primary channeling can be applied also for copper transmission and in SDH networks.