Q.931
ITU-T Recommendation Q.931 is the ITU standard ISDN connection control signalling protocol, forming part of Digital Subscriber Signalling System No. 1. Unlike connectionless systems like UDP, ISDN is connection oriented and uses explicit signalling to manage call state: Q.931. Q.931 typically does not carry user data. Q.931 does not have a direct equivalent in the Internet Protocol stack, but can be compared to SIP. Q.931 does not provide flow control or perform retransmission, since the underlying layers are assumed to be reliable and the circuit-oriented nature of ISDN allocates bandwidth in fixed increments of 64 kbit/s. Amongst other things, Q.931 manages connection setup and breakdown. Like TCP, Q.931 documents both the protocol itself and a protocol state machine.
Q.931 was designed for ISDN call establishment, maintenance, and release of network connections between two DTEs on the ISDN D channel. Q.931 has more recently been used as part of the VoIP H.323 protocol stack (see H.225.0) and in modified form in some mobile phone transmission systems and in ATM.
Podcasts:
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by Nightmare
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by G4
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by Doel Sumbang
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by Skyline
K-141
by: NightmareI'm gonna tell you a well known story
A sacrifice of innocents
24 days of agony
How a last dive, gave them no chance
Somewhere in the arctic, the Russians were telling a
Forgotten by the world
In the rescue chamber, flooded with water
A.D. had to die
Hell awaits the enemy, somewhere in the Barents sea
The system is failing
Hell awaits the enemy, victim of hypocrisy
The system is lying
They will never come back home again
And I've lost another friend
They will never come back home
They are the victims of a vicious game
Commanders of the Russian fleet
Decided to conceal the truth
Somewhere down in the deep
The wreck revealed, they could have saved you
In a grave of steel, the truth was so real
Locked in the shell, their own private hell
One day we all will know why
Hell awaits the enemy, somewhere in the Barents sea
The system is failing
Hell awaits the enemy, victim of hypocrisy
The system is lying
They will never come back home again
And I've lost another friend
They will never come back home
They are the victims of a vicious game...
They will never come back home again
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