2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties 1

Xteras Solution for

DRC SNEL Network

1 December 2015

2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties 2

SNEL Network Physical Topology

DRC/Zambia

border

Luano

To Brazzaville

Kwatebala

(TFM)

Kimbanseke

NSekeHPP

CDC

Likasi

Kasumbalesa

Kimwenza

Utexco

Lingwala

Inga 2

HPP

Inga 1

HPP

Inga DS

Inga CS

Nselo

Manzaw

Kikwit

Tshipoko

Kan

an

ga

Lu

su

ku

Kam

ina

SC

Ko

lwezi

Fu

ng

uru

me

Pan

da

Karavia

Tempa

Shituru

230 k

m

225 k

m

197 k

m

242 k

m

110 km 79 km 118 km

122 km 22 km

96 km

13 km

1.8 km

4.2 km

50 km

231 km

214 km

210 km

11.5 km

37 km

18 km

3 km

2.5 km

213 km

1.1 km

84 km

0.7 km0.8 km

Gombe

Dispatching

(Kinshasa)

Kwilu

Maluku

33 km

34 km

Location of ODFs Existing SNEL stations

Location of SNEL ODFs Stations yet to be built

Location of Optical Joint Boxes (OJBs) Existing SNEL stations

Locations of ODFs outside the SNEL network

Junction (Assumed fiber routing shown here)

Existing SNEL cable routes

Future SNEL cable routes

Existing non-SNEL cable routes

Future non-SNEL cable routes

Projected extension

Junction293 km 12 km

64 km

1.5 km

4 km

18 km

Muanda

150 km

24 fibers

24 fibers 24 f

ibers

Michelo

Kasapa

2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties 3

Kwatebala

(TFM)

18 km50 km

Example of Traffic Pattern Enabled byXteras Solution

Kimbanseke

CDC

Likasi

Kasumbalesa

Kimwenza

Lingwala

Inga DS

Inga CS

Nselo

Manzaw

Kikwit

Tshipoko

Kan

an

ga

Lu

su

ku

Kam

ina

SC

Ko

lwezi

Fu

ng

uru

me

Pan

da

Karavia

Tempa

230 k

m

225 k

m

197 k

m

242 k

m

110 km 79 km 118 km

96 km231 km

214 km

210 km

11.5 km

37 km

18 km

5.5 km

213 km

1.1 km

84 km

GOMBE

Dispatching

(Kinshasa)

Kwilu

Maluku

Junction12 km

64 km

1.5 km

Inga 2

HPP

Inga 1

HPP

0.8 km

Shituru6 km

DRC/Zambia

border

Luano

122 km 22 km

33 km

34 km

4 km

Michelo

NSekeHPP

0.7 km

ROADMs, inline amplifiers and break out equipment

Express 100G wave (no regeneration)

10G wave between adjacent nodes with break out equipment to access sub-10G services

2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties 4

100G waves are optically passed through the nodes.

They can be dropped at any intermediate node for: Local traffic

Regeneration purpose (if desired/needed)

100G add/drop is achieved by remotely reconfiguring the connectivity of the optical switch fabric (ROADM) via the network management system.

High-Level DescriptionTypical Intermediate Node (Two Degrees)

N x 100G +M x 10G waves

Express N x 100G waves

Opticalswitch fabric

N x 100G +M x 10G waves

4 x STM-16 signals

Line fiber

10Ginterfacecards

Opticalamplifiers

2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties 5

By default, 10G waves are added/dropped at each blue node to serve local domestic needs.

The 10G waves are delivered by dual-port muxponder cards: Two 10G ports for connection to the line via the optical switch fabric.

16 optical ports on the client side to deliver small capacity signal (including

GigE signals).

The 10G line ports can be 1+1 protected via an electrical switch built in the

dual-port muxponder card.

High-Level DescriptionTypical Intermediate Node (Two Degrees)

N x 100G +M x 10G waves

Express N x 100G waves

Opticalswitch fabric

N x 100G +M x 10G waves

4 x STM-16 signals

Line fiber

10Ginterfacecards

Opticalamplifiers

2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties 6

Express 100G waves between Gombe Kinshasa and Kasumbalesa

Local 10G waves between any pair of two adjacent sites highlighted in blue color on the network drawing

Typical Link ConfigurationDay One Configuration Main Trunk

1 x 100G +1 x 10G waves

Express

N x 100G waves

4 x STM-16 signals

10Ginterfacecards

Express

N x 100G waves

4 x STM-16 signals

10Ginterfacecards

4 x STM-16 signals

10Ginterfacecard

100Ginterfacecard with10 x 10Gclients

Q x 10 Gsignals

4 x STM-16 signals

10Ginterface

card

100Ginterfacecard with10 x 10G

clients

Q x 10 Gsignals

Local10G wave

Local10G wave

Express 100G wave

Rack #2

Rack #1

Rack #2

Rack #1

Rack #2

Rack #1

Rack #2

Rack #1

7 2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties

Xteras Design vsMore Traditional Design

2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties 8

1 x 100G +1 x 10G waves

Xteras Design vs More Traditional Design

1 x 100G +1 x 10G waves

Express

N x 100G waves

P x 1 GigE signals

10Ginterfacecards

Express

N x 100G waves

P x 1 GigE signals

10Ginterfacecards

P x 1 GigE signals

10Ginterfacecard

100Ginterfacecard with10 x 10Gclients

Q x 10 Gsignals

P x 1 GigE signals

10Ginterface

card

100Ginterfacecard with10 x 10G

clients

Q x 10 Gsignals

P x 1 GigE signals

100Gcard

100Gcard

Electricalswitchfabric

P x 1 GigE signals

100Gcard

100Gcard

Electricalswitchfabric

100Gcard

Electricalswitchfabric

Q x 10 Gsignals

P x 1 GigEsignals 100G

cardElectricalswitchfabric

Q x 10 Gsignals

P x 1 GigEsignals

100G express

10G omnibus

100G omnibus

Xteras Design All-optical design enabled by Raman optical amplification

More Traditional Design 100G regeneration at every site (due to the long spans)

2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties 9

Xteras Design All-optical design enabled by Raman optical amplification

100G cards only for express traffic

End-to-end 100G express traffic between Gombe Kinshasa and Kasumbalesa

with no intermediate regeneration

Low incremental cost when new 100G capacity is added.

Hardware separation (at the card/shelf/rack level) between 100G and 10G

traffics

Higher global network reliability

More Traditional Design 100G regeneration at every site 100G regeneration at every node

100G waves support both international and domestic traffics.

Slow and costly capacity upgrade

Lower global network reliability

Xteras Design vs More Traditional Design

10 2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties

Summary

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Unrivaled long-span capability enabling to bridge the long spans as found in SNEL network with no need for extra intermediate site.

Unique long reach capability enabling long end-to-end all-optical data path with no need for intermediate regeneration for the express 100G waves

Low incremental cost for new capacity

Ultra short turn-up time (only one card in Gombe, and one card in

Kasumbalesa)

Supporting both express 100G and local 10G waves on the same fiber pair.

Reconfigurable Optical Add/Drop Multiplexers (ROADMs) at all sites for maximal flexibility in the optical layer (e.g. change in traffic patterns)

Unique experience in equipping optical networks over power grids with similar requirements (long spans) and challenging environment (e.g. Amazon region).

Summary

Maximizing Network Capacity, Reach and ValueOver land, under sea, worldwide

12 2015 Xtera Communications, Inc. Proprietary & Confidential Not for disclosure to third parties