Lec21 22 Isdn Lecture
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BROADBAND DIGITAL NETWORKS By Engr. Awais Ahmed Khowaja
Mehran University of Engineering and Technology, Jamshoro. 01TL-BATCH This class will meet: 8.00-10.00 a.m. (Mondays) 10.00-12.00 noon (Tuesdays)
Today's Lecture: ISDN 1
2
3
Asynchronous Versus ISDN SW
SW
Channel bank
Channel bank
• Analog converted to digital and back SW
SW
The advantages of ISDN over analog connections include: Higher speed Faster call setup Cheaper than leased lines Voice and data can be run simultaneously
• Digital endtoend 4
Integrated Services Small office
Digital PBX
Home office
Telecommuter
Provider network
Central site
• Voice, data, video, and special services 5
6
7
8
9
ISDN Services and Channelized E1 and T1 2B
{
D
BRI
16 kbps
23B (T1) or 30B (E1)
144 kbps
}
PRI
D
31 64 kbps channels
}
56/64 kbps 56/64 kbps
}
E1 24 DS0s
64 kbps each
T1 1.544 Mbps
64 kbps
E1 2.048 Mbps (includes sync)
or
2.048 Mbps (includes sync)
T1
}
1.544 Mbps (includes sync)
10
BRI Call Processing
1 Q.931 signaling
ISDN service provider 4
2
3 Q.931 signaling
SS7
B channel D channel/SS7 signaling
11
12
13
14
15
16
BRI Functional Groups and Reference Points S
TE1 ISDN terminal equipment
R TE2
T
NT2 Customer premises switching equipment
U
NT1 Local loop terminator
LE ISDN local exchange
TA
NonISDN Terminal terminal adapter equipment 17
Physical Representation of BRI Reference Points To nonISDN device (TE2)
R
To ISDN service
S/T
TA
4wire circuit
S/T bus ISDN phone
S/T bus
Cisco ISDN router
NT1
U 2wire circuit
Wall jack
S/T interface as a multipoint connection 18
PRI—Layer 1 Standards and Reference Points
TE
S/T ITUT I.430
CSU/ DSU
U
LE ITUT I.431 ANSI T1.601
19
20
21
22
23
24
25
26
27
28
29
30
31
ISDN Protocol Layers Layer 3 Layer 2 Layer 1
D Channel
B Channel
DSS1 (Q.931)
IP/IPX
LAPD (Q.921)
HDLC/PPP/FR/ LAPB
I.430/I.431/ANSI T1.601
32
33
34
ISDN Layer 2 TEI/SAPI
Daisychain S/T bus
TEI/SAPI NT1
LE
ISDN
– ITU-T Q.920 and Q.921 – Defines logical link between TE/TA and NT2/LE – Carries Layer 3 D-channel messages
35
ISDN Layer 3—D Channel Q.931 TE
NT1
Q.931
LT
ET
ISDN switch (LE) • Q.931 defines call control between the TE and local switch 36
Q.931 Messaging—Call Setup Example
Calling party
Called party
Time
Setup Setup acknowledge Call proceeding
Alerting
ISDN service provider
Setup Call proceeding Alerting Connect
Connect Connect acknowledge
Connect acknowledge
ISDN switch
ISDN switch 37
Q.931 Messaging—Call Teardown Example Time
Calling party
Disconnect Disconnect
Called party
Release
ISDN service provider
Released
Released
Release complete Release complete
ISDN switch
ISDN switch 38
DDR Operation Incoming packet
Interesting ?
No
Yes Yes
Connected ?
Reset Idle Timer
Connected ?
No Interface up?
No
No
Yes
Yes Phone # ?
No
Yes
Dial Send 39
Using DDR with ISDN 1.
BRI or
2.
PRI
3.
ISDN service provider
4.
Remote router
1. Packet arrives 2. Switch packet to DDR interface, determine if interesting 3. If interesting, dial DDR destination via ISDN 4. Connect to remote router 40
ISDN Configuration Tasks ISDN
– Global configuration
–Select switch type –Specify traffic to trigger DDR call
– Interface configuration
–Select interface specifications –Configure ISDN addressing
– Optional feature configuration 41
ISDN Configuration Commands – Set global parameters with this command: • isdn switch-type
– Set interface parameters with these commands: • encapsulation ppp
42
Selecting the ISDN Switch Type Router(config)#isdn switch-type switch-type
Router(config-if)#isdn switch-type switch-type
– Specifies the type of ISDN switch with which the router communicates – Global or interface command
43
Setting Interface Protocols Router(config-if)#encapsulation {ppp | hdlc}
• Selects framing for that ISDN BRI Router(config-if)#ppp authentication {pap | chap | ms-chap}
• Selects PPP authentication type
44
DDR Configuration Tasks Interesting traffic arrives BRI or PRI
Dial destination
ISDN service provider
Remote router
1. Define interesting traffic 2. Assign interesting traffic definition to ISDN interface 3. Define destination 4. Define call parameters 45
Defining Interesting Traffic Router(config)#dialer-list dialer-group-number protocol protocol-name {permit | deny} list access-list-number
• Defines interesting packets for DDR • Associated with the dialer group assigned to the interface Router(config-if)#dialer-group group-number
• Assigns an interface to the dialer access group specified in the dialerlist command
46
47
Mehran University of Engineering and Technology, Jamshoro. 01TL-BATCH This class will meet: 8.00-10.00 a.m. (Mondays) 10.00-12.00 noon (Tuesdays)
Today's Lecture: ISDN 1
2
3
Asynchronous Versus ISDN SW
SW
Channel bank
Channel bank
• Analog converted to digital and back SW
SW
The advantages of ISDN over analog connections include: Higher speed Faster call setup Cheaper than leased lines Voice and data can be run simultaneously
• Digital endtoend 4
Integrated Services Small office
Digital PBX
Home office
Telecommuter
Provider network
Central site
• Voice, data, video, and special services 5
6
7
8
9
ISDN Services and Channelized E1 and T1 2B
{
D
BRI
16 kbps
23B (T1) or 30B (E1)
144 kbps
}
PRI
D
31 64 kbps channels
}
56/64 kbps 56/64 kbps
}
E1 24 DS0s
64 kbps each
T1 1.544 Mbps
64 kbps
E1 2.048 Mbps (includes sync)
or
2.048 Mbps (includes sync)
T1
}
1.544 Mbps (includes sync)
10
BRI Call Processing
1 Q.931 signaling
ISDN service provider 4
2
3 Q.931 signaling
SS7
B channel D channel/SS7 signaling
11
12
13
14
15
16
BRI Functional Groups and Reference Points S
TE1 ISDN terminal equipment
R TE2
T
NT2 Customer premises switching equipment
U
NT1 Local loop terminator
LE ISDN local exchange
TA
NonISDN Terminal terminal adapter equipment 17
Physical Representation of BRI Reference Points To nonISDN device (TE2)
R
To ISDN service
S/T
TA
4wire circuit
S/T bus ISDN phone
S/T bus
Cisco ISDN router
NT1
U 2wire circuit
Wall jack
S/T interface as a multipoint connection 18
PRI—Layer 1 Standards and Reference Points
TE
S/T ITUT I.430
CSU/ DSU
U
LE ITUT I.431 ANSI T1.601
19
20
21
22
23
24
25
26
27
28
29
30
31
ISDN Protocol Layers Layer 3 Layer 2 Layer 1
D Channel
B Channel
DSS1 (Q.931)
IP/IPX
LAPD (Q.921)
HDLC/PPP/FR/ LAPB
I.430/I.431/ANSI T1.601
32
33
34
ISDN Layer 2 TEI/SAPI
Daisychain S/T bus
TEI/SAPI NT1
LE
ISDN
– ITU-T Q.920 and Q.921 – Defines logical link between TE/TA and NT2/LE – Carries Layer 3 D-channel messages
35
ISDN Layer 3—D Channel Q.931 TE
NT1
Q.931
LT
ET
ISDN switch (LE) • Q.931 defines call control between the TE and local switch 36
Q.931 Messaging—Call Setup Example
Calling party
Called party
Time
Setup Setup acknowledge Call proceeding
Alerting
ISDN service provider
Setup Call proceeding Alerting Connect
Connect Connect acknowledge
Connect acknowledge
ISDN switch
ISDN switch 37
Q.931 Messaging—Call Teardown Example Time
Calling party
Disconnect Disconnect
Called party
Release
ISDN service provider
Released
Released
Release complete Release complete
ISDN switch
ISDN switch 38
DDR Operation Incoming packet
Interesting ?
No
Yes Yes
Connected ?
Reset Idle Timer
Connected ?
No Interface up?
No
No
Yes
Yes Phone # ?
No
Yes
Dial Send 39
Using DDR with ISDN 1.
BRI or
2.
PRI
3.
ISDN service provider
4.
Remote router
1. Packet arrives 2. Switch packet to DDR interface, determine if interesting 3. If interesting, dial DDR destination via ISDN 4. Connect to remote router 40
ISDN Configuration Tasks ISDN
– Global configuration
–Select switch type –Specify traffic to trigger DDR call
– Interface configuration
–Select interface specifications –Configure ISDN addressing
– Optional feature configuration 41
ISDN Configuration Commands – Set global parameters with this command: • isdn switch-type
– Set interface parameters with these commands: • encapsulation ppp
42
Selecting the ISDN Switch Type Router(config)#isdn switch-type switch-type
Router(config-if)#isdn switch-type switch-type
– Specifies the type of ISDN switch with which the router communicates – Global or interface command
43
Setting Interface Protocols Router(config-if)#encapsulation {ppp | hdlc}
• Selects framing for that ISDN BRI Router(config-if)#ppp authentication {pap | chap | ms-chap}
• Selects PPP authentication type
44
DDR Configuration Tasks Interesting traffic arrives BRI or PRI
Dial destination
ISDN service provider
Remote router
1. Define interesting traffic 2. Assign interesting traffic definition to ISDN interface 3. Define destination 4. Define call parameters 45
Defining Interesting Traffic Router(config)#dialer-list dialer-group-number protocol protocol-name {permit | deny} list access-list-number
• Defines interesting packets for DDR • Associated with the dialer group assigned to the interface Router(config-if)#dialer-group group-number
• Assigns an interface to the dialer access group specified in the dialerlist command
46
47
