COMMON CHANNEL SIGNALING (CCS#7)

CONTENT1)Introduction.2)signaling.3)Types of signaling.4)Use of signal.5)Transmitting part.6)CAS & CCS77)Features of ccs#7 signaling.8)The function of signaling are as follows.9)CCS principle.10)MTP & TUP.11)Advantage of ccs7,Disadvantage.

INTODUCTION

In telephony , common -channel signaling (ccs), is the transmittion of signaling information on a separate channel from the actual traffic viz voice or data and more specifically where that signaling channel controls multiple data channels.

SIGNALING

Signaling is used between user and the network ,or between two network Element to exchange various control information.

TYPES OF SIGNALING

Channel Associated Signaling (CAS)

Common Channel Signaling (CCS)

Signaling System Number 7(SS7) is a form of Common Channel Signaling

USE OF SIGNAL

The use of signal for controling communication.The sending of a signal from the transmitting end of a telecommunication circuit to inform a user at the receiving end that a message is to be sent.

TRANSMITTING PART

Common Channel Signaling

Channel Associated Signaling：

Transmitting path

CASIn CAS each and every speech channel is associated with a signaling Channel. This means for each speech channel a separate signalingChannel is required.

CCS7

CCS7 is a message based ,multi-layer network to network signaling system designed for fully digital exchanges.

Switch A Switch B

Voice trunk

Signaling link

FEATURES OF CCS#7 SIGNALING

Internationally standardized. Suitable for various communication services such as telephony ,text, data service.

High performance and high real ability for message transfer.

FEATURES OF CCS#7 SIGNALING

Signaling links always available even during existing calls.o Transfer rate of 64 kb. o It is typical in digital network.

THE FUNCTION OF SIGNALING ARE AS FOLLOWS

To set up a call. To supervise the call. To clear a call.

CCS PRINCIPLE

Out of band signaling . Higher signaling data rates. Optimum use of bandwidth. Reliability and flexibility.

THE INITIAL PHASE OF SS7 CONSISTED OF TWO PART

1)Message Transfer part-MTP(responsible for transferring message)2)Telephone user part-TUP (user of messages)

The part responsible for taking these message from one network element to another network element is known as the message transfer part(MTP)

MESSAGE TRANSFER PART(MTP)

TELEPHONE USER PART(TUP)

The previous section explained the MTP. But who is the user who recevies ,sends and acts on these message ? ans is TELEPHONE USER PART. Those standard sets of message that were metioned previously are the standard TUP message that help to set up the call, to supervise and clean it.

ADVANTAGES OF CCS7

Higher signaling data rates(56kbps&64kbps).

Reliability and flexibility.

Faster call set-up time.

Time saving.

DISADVANTAGES

The error rate of the common channel signaling system must be very low.

The SS7 systems that every transnational corporation produces are having ome problems in compatibleness.

ADVANTAGES OF CCS OVER CAS

Compared with Channel Associated Signaling, Common Channel Signaling has many important advantages

Information can be switched between processors much faster than in channel-associated signaling.

Faster call setup. No interference between signaling tones by

network and frequency of human speech pattern.

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