SS7 Interview Preparation Guide
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Signalling System No 7 (SS7) frequently Asked Questions by expert members with experience in SS7. These interview questions and answers on Signalling System No 7 (SS7) will help you strengthen your technical skills, prepare for the interviews and quickly revise the concepts. So get preparation for the Signalling System No 7 (SS7) job interview

21 Signalling System No 7 (SS7) Questions and Answers:

1 :: How many links are possible between 2 ss7 links?

2 links.
High Speed Links (HSL)
Low Speed Links (LSL)
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2 :: What is the difference between MTP3 and MTP3B?

MTP3 is used for Narrowband signaling and is the
traditional TDM based transmission system.On the other hand
MTP3b is used for Broadband signaling and basically
designed for supporting ATM features on the basis of MTP3.
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3 :: Do you know What is the address of one node in ISUP?

SPC, Signalling point code
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4 :: Explain devices that operate at the different layers of the OSi/TCP/IP model clearly stating their functions at the respective layers?

physical layer -----all phsical devices like wires,
connectors, hubs repeaters,electrical signals,

Datalink layer--------switch ,briges,

Network layer--------routers or brouter

transport ------gateways
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5 :: What is difference between osi layer and tcp/ip suite?

In OSI reference model, there are seven layers which are
Application layer, Presentation layer, Session layer,
Transport layer, Network layer, Datalink Layer, and
Physical layer. It is detailed model for the transfer of
information from one destination from other. While the TCP/
IP suite was somewhat compact, it was not as detailed.
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6 :: What is continuity test in SS7 and why it is performed?

COT is an automated diagnostic procedure performed in the
Signaling System 7 (SS7) Public
Switched Telephone Network (PSTN) between switches to
ensure that circuits are in service and not
experiencing excessive signal loss. This validation is
performed by sending tones across the bearer channel. It
is performed on a sampling basis. For instance, on 10
percent of the calls
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7 :: What is the difference between SCCP and MTP3?

In MTP3 The routing label details like Servive
indicator ,servive network type ,OPC and DPC details are
aviable.The SCCP is the Transport layer for Tcap Based
applications.The SCCP Placed over the MTP3 layer.
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8 :: What is ss7 stack?

http://www.cisco.com/en/US/products/hw/switches/ps2246/products_pre-installation_guide_chapter09186a00800ea6d2.html
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9 :: What are the different functionalities of MTP3 layer?

Message Transfer Part level 3 (MTP3) is the network layer in
the SS7 protocol stack. It routes SS7 signalling messages to
public network nodes by means of Destination Point Codes,
and to the appropriate signalling entity within a node by
means of a Service Info Octet. MTP3 is specified as part of
the SS7 protocol and is also referred to as part of the
B-ICI interface for ATM. MTP3 sits between MTP2 and the user
parts (ISUP, TUP, SCCP and TCAP) of the SS7 protocol stack.
B-ISUP is an Application Layer protocol run over MTP3.
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10 :: If there is no RLC in response to REL what will the intermediate switch will do?

After timeout intermediate switch will release the call.
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