DCN Over Channalized E1

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Characteristics:

• Any Structured E1 in MINI-LINK TN can be used to transport IP DCN with robbed timeslot.

• In an E1 used for robbed timeslot, the timeslots not used for IP DCN transport can be used

for regular traffic.

• It is possible to select any timeslot (1-31*64 kbps) in an E1 for robbed timeslot.

• Max two robbed timeslots connections can be terminated per MINI-LINK TN.

• The two robbed timeslot connections must be on the same cross-connected E1.• MINI-LINK TN can transparently propagate multiple E1s containing robbed timeslot

connections to other MINI-LINK TN nodes. These robbed timeslot connections would be

terminated further out in the network.

• One PPP connection over n*64kbps timeslots is established for each of the robbed timeslot

connections.

• The number of timeslots used for robbed timeslot can be individually set for the two

directions.

DCN over Channalized E1

(“Robbed Timeslots”)

Prepared by: Alan Macieira

Ericsson - Brazil

Date: June / 2011

Rev.: A



TN

NPU

Site A

Site B

Leased Line

TN

NPU

MMU

INPUT E1OUTPUT E1

INPUT E1 OUTPUT E1

MMU BTS

E1 with Traffic

+ DCNOther vendor

Equipment

Other vendor

Equipment

Router

E1 with Traffic

+ DCN

DCN

E1 with Trafficfrom BTS


(“Robbed Timeslots”)

BSC

E1 with Traffic

from BTS

Timeslot Empty

Timeslot used for Traffic from BTS

Timeslot used for DCN Traffic


Date: June / 2011

Rev.: A

NPU3 B – TR: 4D NPU3 B – TR: 4C

NPU3 B – TR: 4DNPU3 B – TR: 4C

CONNECTIVITY PLAN

Othervendor

TX



Other vendor TX

SITE ASITE B

OSPF ID 0.0.0.0

No Stub

192.168.0.9 / 29

OSPF ID 0.0.0.0

No Stub

192.168.0.1 / 29

USING OSPF PROTOCOL


Notes:

By defaul t un-num bered IP over PPP is establ ishedbetween the two nodes.


Date: June / 2011

Rev.: A

Other Vendor

Equipment

Other Vendor

Equipment



1 - SITE B configuration

( Robbed Timeslots )



1.1 - Right click Configure > DCN from management tree at Local Craft.

1.2 - On DCN over Traffic choose DCN over Channalized E1 as DCN Service.

CONNECTIVITY PLAN CONFIGURATION

1.3 - Set Interface 1 Settings with the correct E1 coming from BTS

(in this example NPU3 B – TR:4C).

1.4 – Set Clock Source.

1.5 – Set Framing Type.

1.7 - Set Interface 2 Settings with the correct E1 going to opposite node

(in this example NPU3 B – TR:4D).



1.6 –

Set Timeslots for DCN (in this example TS 1 & 2).

1.10 – Set Timeslots for DCN (in this example TS 1 & 2).



BASIC CONFIGURATION

1.11 - Right click Configure > Basic NE from management tree at Local Craft.

1.12 - Fill NE IP Address, NE Subnet Mask and Default Gateway.

Site B Conf igurat ion:

IP Address: 192.168.0.9

Subnet Mask: 255.255.255.248

Default Gateway: 0.0.0.0



1.13- Right click Configure > DCN from management tree at Local Craft.

1.14 - On OSPF Areas fill Net Address, NE Subnet Mask,

Area ID and Area Type.

OSPF CONFIGURATION



2 - SITE A configuration( Robbed Timeslots )



2.2 - On DCN over Traffic choose DCN over Channalized E1 as DCN Service.

CONNECTIVITY PLAN CONFIGURATION


2.3 - Set Interface 1 Settings with the correct E1 coming from the opposite node(in this example NPU3 B – TR:4C).



2.7 - Set Interface 2 Settings with the correct E1 going to the BSC direction(in this example NPU3 B – TR:4D).



2.6 – Set Timeslots for DCN (in this example TS 1 & 2).

2.10 – Set Timeslots for DCN (in this example DCN has been already



2.11 - Right click Configure > Basic NE from management tree at Local Craft.

2.12 - Fill NE IP Address, NE Subnet Mask and Default Gateway.

Site A Conf igurat ion:

IP Address: 192.168.0.1

Subnet Mask: 255.255.255.248

Default Gateway: 0.0.0.0

BASIC CONFIGURATION




2.14 - On OSPF Areas fill Net Address, NE Subnet Mask,

Area ID and Area Type.

OSPF CONFIGURATION



3 – Connectivity Verification( Robbed Timeslots )

CONNECTIVITY VERIFICATION





3.3 – If required, a numbered PPP can be set

(in case of ABR for example).

3.2 – By default a un-numbered PPP is created (blank).




3.4 – Click on PPP Status.

3.5 – PPP is working properly (UP).






3.6 – Connecting to SITE A

3.7 – Checking OSPF Routing Table

3.8 – Connectivity Test.

To physical connection to SITE A traffic Node can be by USB or Ethernet Port. In this example a USB Port

was used. To connect using Ethernet Port is necessary change IP Address from PC to the same subnet

address from SITE A Traffic Node.

OTHER REFERENCES



OTHER REFERENCES

DCN DESIGN: OSPF PREMISES

https://ericoll.internal.ericsson.com/sites/GKO//Lists/GKO/DispForm.aspx?ID=52924&Source=http://

ericoll.internal.ericsson.com/sites/Microwave_Networks/default.aspx

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DCN Over Channalized E1