FTTM Network Design: Excellent Notes

FTTM Network design: I have tried to create a excellent note on the FTTM network design.I hope you all like. First I want to tell a bit about FTTM, FTTM means Fiber To The Mobile, Fiber network used for the backhaul of the mobile traffic. GPON play an important role in the FTTM network design.

GPON network will be used as a bridge between the Radio Access Network and the IP/MPLS that connects to the Mobile Core network. Residential and EBU users traffic co exist with the mobile backhaul traffic in the same OLT. GPON means Gigabit-capable Passive Optical Network-An OLT that is connected to one or more ONUs/ONTs using an ODN (Optical Distribution Network).

FTTM Network Backhaul

High level network overview for FTTM backhaul

MDUs connectivity with the Mobile Base Stations Nodes

MDU means Multi Dwelling Unit-It terminates one of the distributed endpoints of an ODN, implements a PON protocol, and adapts PON PDUs to subscriber service interfaces. It supports multiple subscribers.

Below mentioned three base-station are connected with the co-located MDU installed inside the Microwave rack at the RF site.
➥2G Base Station
➥3G Base Station – NodeB
➥4G Base Station – eNodeB

First I want to describe about NodeB and eNode B, Node B is a term used in UMTS equivalent to the BTS in GSM. It is the network element that is connected to RAN and communicates directly with mobile handsets. eNodeB-Evolved Node B- Node . eNodeB does not have a separate controller element. eNodeB embeds its own control functionality, rather than using a separate Network Controller like the RNC (Radio Network Controller) controls the Node B.
➥ALU will use the MDU I040G-P. It will be connected with the ALU RF site and/or NSN RF site.
➥Ericsson will use the MDU T202G. It will be connected with the Ericsson RF site.
➥Huawei will use the MDU MA5612. It will be connected with the Huawei RF site and/or NSN RF site.

Alcatel-Lucent MDU connectivity with the Mobile Base Station Node

ALU will provide the MDU I-040G-P which has the following interfaces;
➥4GE Interfaces
➥8POTS
➥4E1s
2G, 3G and 4G Base Stations are connected with an Ethernet Switch which is connected to a single GE UNI interface on the MDU

ALU MDU connectivity for FTTM

Alcatel-Lucent MDU connectivity with the mobile base station

Ericsson MDU Connectivity with the Mobile Base Station Node

Ericsson will provide MDU T202g which has the following interfaces:
➥4GE Interfaces
➥8POTS
➥4E1

The BTS, NodeB and eNodeB are connected with the SIU (Site Integration Unit) which is connected with a single GE UNI port on the MDU.

Ericsson MDU connectivity for FTTM

Ericsson MDU connectivity with the mobile base station

Huawei MDU connectivity with the Mobile Base Station Node
Huawei will provide MDU MA5612 which has the following interfaces:
➥2GE Interfaces
➥6FE Interfaces
Each Base Station is connected with a dedicated UNI port on the MDU. BTS is connected with the FE port and the NodeB and eNodeB are connected, one on each GE port.

Huawei MDU connectivity for FTTM

Huawei MDU connectivity with the mobile base station

Hardware Configuration in the OLT

Only upto 32 mobile sites can be homed to a single OLT. Within one OLT, the last two cards will be used in case of 8 Ports OLT cards, and the last four cards will be used in case of 4 Ports OLT cards. Two 8-port line cards are configured in 1+1 redundant mode. One port in one 8-port line card is paired with a port in another 8-port line card implementing the type-B protection. There is no protection supported in the 4-port line card.

Hardware configuration details

Hardware configuration in the OLT

Connectivity in the GPON Network

GPON network provide the connectivity between the MDU and the OLT. According to the new design (some telecom operators use the same), the 2 PON ports will be connected with the 2:4 Splitter through 2 different fibres. The Splitter will provide the 2:4 splitting.

This 2:4 Splitter is installed either outside the exchange or inside the exchange, but should be restricted to the OSP element. In case of the outside the exchange, the 2:4 Splitter will be installed in the manhole or in the hand-hole. 

Type B-Protection

1+1 PON port protection will be implemented having 2 ports in different line cards. The 2 PON ports from 2 different GPON line cards will be configured in (1+1) Type-B redundant mode. These 2 PON ports will be connected with the 2:4 Splitter which will split the signal into 4 towards the customers’ side. Telecom operators can use 2 different resilience fiber paths to use between exchange and the splitter. It also provides the card redundancy in the OLT. 

Splitter outside the Exchange

Splitter installed outside the exchange

Currently Huawei OLT (with 8-port line card configuration) supports 1+1 port protection having the 2 ports in different line cards. ALU OLT (with 8-port line card configuration) currently does not support 1+1 port protection having the 2 ports in different line cards. There will be no protection in case of the 4-port line cards.

Splitter inside the exchange in FTTM

Splitter installed inside the exchange

From the given below picture, you can understand how Type-B Protection work in FTTM network.

Type-B Protection

Type-B Protection in FTTM Network

Summary
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