SS7 Interview Questions And Answers

Some times called 'file system aging'is the inability of a
file system to lay out related data sequentially
(contiguously), an inherent phenomenon in storage-backed
file systems that allow in-place modification of their
contents. It is a special case of data fragmentation.

elictrical hazard >>>as ESD
mechanical hazard>>> as haeavy materials hazards
chemical hazard >>> as battery liquides

Computer is powered on -> Power On Self Test (POST) is done
to check all the hardware -> BIOS (detects the devices like,
hard-disk, sets the date and time etc.) -> MBR (locates the
first location of boot-loader and starts booting the
boot-loader) -> boot-loader (locates the OS and starts
loading the OS).

Floopy Disc store data Less than 200MB CD,DVD's are more
than 200MB
CD-700MB
DVD-4.3to 8.5GB

Computer data storage, often called storage or memory, refers to computer. Memory can refer to other forms of fast but temporary storage. ... The CPU continuously reads instructions stored there and executes them as required. ... The CPU firstly sends a number through an address bus, a number called memory address...

The four parameters between node A and node B, to bring a
PCM link up between them are
1.DPC(Destination Point Code) and OWNSP

2.Signaling Link set.

3.Network ID(NAT0 & NAT1)

4.PCM channel on which link is creating

Tow types of tcp/ip protocol is two types tcp/ipv4 & tcp/ipv6.
tcp/ipv4 it is 32 bit now a days it is used.
tcp/ipv6 it is 128 bits it is advancd technology.

full form of D-link is diagonal link . this link actually
used to connect the STP pairs within the same network .

there r so many types of cross cables this is Standard cross cable :-
white.orange ------ White green
orange ------ green
white.green ------ white.orange
blue ------ blue
white.blue ------ white blue
gree ------ orange
white.brown ------ white brown
brown ------ brown

IAM(Initial Address Message)contains the information
requried for setup call.For a basic call it is a first
message send to Destination.
SAM(subsequent address message)exactly it is overlap calls
address.
SAM message has to be sent in the scenario when suppose a
subscriber dialed a number 9321353536.
SSP send the IAM message to there destination without
reading the 353536. I.e originating SSP looks 9321 and
sends the IAM message to their respective Destination.
And SAM to be send with rest dialed digit.

There are 6 links
A-Access link
B-Bridge link
C-Crossover link
D-Diagonal link
E-Extended link
F-Fully Associated link

After timeout intermediate switch will release the call.

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.

http://www.cisco.com/en/US/products/hw/switches/ps2246/products_pre-installation_guide_chapter09186a00800ea6d2.html

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.

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

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.

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

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

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

transport ------gateways

SPC, Signalling point code

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.

2 links.
High Speed Links (HSL)
Low Speed Links (LSL)