8/10/2019 hdlc-121021124652-phpapp02

1/5

ASSINGMENT 2(CN)

ON

High-Level Data Link

Control

BY UMESH GUPTA

B.TECH CSE

BTC/10/064

8/10/2019 hdlc-121021124652-phpapp02

2/5

CONTENTS

Introdut!on

H"#C St$t!on% $nd Con&'ur$t!on% H"#C Con&'ur$t!on

H"#C Or$t!on$* Mod%

8/10/2019 hdlc-121021124652-phpapp02

3/5

8/10/2019 hdlc-121021124652-phpapp02

4/5

and receie co""ands and responses without any per"ission fro" any

other stations on the link.

HDLC Confguration!he three configurations defined by HDLC:

Unbalanced Configuration:!he unbalanced configuration in an HDLC

link consists of a pri"ary station and one or "ore secondary stations. !he

unbalanced occurs because one stations controls the other stations.

Balanced Configuration: !he balanced configuration in an HDLC linkconsists of two or "ore co"bined stations. 'ach of the stations has e$ual

and co"pli"entary responsibility co"pared to each other.

Symmetrical Configuration:It consists of two independent point to

point# unbalanced station configurations. In this configuration# each

station has a pri"ary and secondary status. 'ach station is logically

considered as two stations.

HDLC Oerational !odesT% tr od% o or$t!on% $r9

Nor"al #esonse !ode (N#!)$T r!$r %t$t!on

!n!t!$t% tr$n%r% to t %ond$r %t$t!on. T %ond$r%t$t!on $n on* tr$n%!t $ r%on% -n $nd on* -n

!t !% !n%trutd to do %o + t r!$r %t$t!on.

%s&nchronous #esonse !ode (%#!)$ T r!$r

%t$t!on do%n7t !n!t!$t tr$n%r% to t %ond$r %t$t!on.In $t t %ond$r %t$t!on do% not $ to -$!t tor! 5*!!t r!%%!on ro t r!$r %t$t!on totr$n%r $n r$%. T r$% $ + or t$n :u%t$3no-*d'nt r$%.

%s&nchronous 'alanced !ode (%'!)$T!% od u%%o+!nd %t$t!on%. Tr !% no nd or r!%%!on on t

8/10/2019 hdlc-121021124652-phpapp02

5/5

$rt o $n %t$t!on !n t!% od. T!% !% +$u% o+!nd%t$t!on% do not r;u!r $n %ort o !n%trut!on% to ror$n t$%3 on t *!n3.

H"#C $*%o d&n% tr non,or$t!on$* od%. T% trnon,or$t!on$* od% $r9

Nor"al Disconnected !ode (ND!)

%s&nchronous Disconnected !ode (%D!)

Initialiation !ode (I!)

T t-o d!%onntd od% (N"M $nd A"M) d!8r ro tor$t!on$* od% !n t$t t %ond$r %t$t!on !% *o'!$**d!%onntd ro t *!n3. T IM od !% d!8rnt ro tor$t!on% od% !n t$t t %ond$r %t$t!on7% d$t$ *!n3ontro* ro'r$ !% !n nd o r'nr$t!on or !t !% !n nd o $n5$n' o $r$tr% to + u%d !n $n or$t!on$* od.