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MDF (Main Distribution Frame)

The MDF is located inside the telephone exchange and interconnects the main equipment inside the exchange to the cables going to subscribers. The primary wire from the MDF and cable chambers can contain 200-1200 pairs. The MDF marks the end of the local exchange, which is considered inside plant, while outside plant refers to cables, towers, poles, and cabinets between the MDF and distribution points. A distribution point contains 10 connections for 10 subscribers and is located on a telephone pole, with the wires from it to subscribers called drop wires.

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919 views2 pages

MDF (Main Distribution Frame)

The MDF is located inside the telephone exchange and interconnects the main equipment inside the exchange to the cables going to subscribers. The primary wire from the MDF and cable chambers can contain 200-1200 pairs. The MDF marks the end of the local exchange, which is considered inside plant, while outside plant refers to cables, towers, poles, and cabinets between the MDF and distribution points. A distribution point contains 10 connections for 10 subscribers and is located on a telephone pole, with the wires from it to subscribers called drop wires.

Uploaded by

Gentle Trader
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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MDF (Main Distribution Frame)


MDF stands for “Main Distribution Frame”. The Basic function of MDF is to interconnect the
main equipment’s which are present inside the exchange with the cables which are going to the
subscriber (customer).
The wire coming from “MDF” and “Cable Chambers” is called as “Primary Wire”. The Primary
wire may contain 200 up to1200 pairs.
Inside Plant: MDF is actually the point where the Local Exchange ends, so the Local exchange
and MDF are the basically “Inside Plant”.
Outside Plant: All the cables, towers, poles, cabinets till the DP are referred as the “Outside
Plant”.

DP:
DP is abbreviation of “Demarcation Point”. One DP contains 10 connections or pairs of wires
coming from it, which go towards 10 subscribers. The wires which are coming out of DP are
called as “Drop Wires”. DP is located at the “Telephone Pole”.

Basic Telecommunication Networks:


 Purpose: to transmit user information in any form to another user of network
 Consists of different networks providing different services, e.g., data, fixed and cellular
telephony services
 Three technologies needed for communication through a network
- Transmission, Switching and Signaling
Switching:
 With the growth of telephones there was a need to switch signals from one wire to
another
 At first switches were manually controlled
 Automatic switches, known as exchanges
 Switching had to be controlled by telephone user with the help of pulses generated by a
dial
 Modern exchanges are software controlled having capacity of thousands of subscribers.
Exchanges:
 An exchange is made up of thousands of local lines grouped together into a single switched
grouping connected to and switched from a central office
 This physical grouping relates to how phone numbers are grouped together
 Each exchange is a set of one or more cross-connect switches in one or more central offices
that answer to a single three-digit code
 Three-digit code is the first three of seven numbers that is dialed for local calls
 Central offices often serve more than one exchange.

Why people don’t choose Ptcl:

1. Quality of Service offered to the Customer is very poor and in-efficient, especially the
Internet service.
2. Lack of technical staff in DSL technical support.
3. Poor organizational structure.
4. No clear strategic direction.
5. No research and development programs.
6. Functional units are not well organized.
7. Weak marketing of new services.
8. Bad debts due to non-payments of bills.
9. Low revenue per user.
10. Low rate of customer retention.
11. Extra employee overhead due to over-hiring.

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