EMX-N48 8-channel Pair-Gain System with integrated 4-port mini IP-DSLAM

Bottleneck of traditional Pair-Gain Solution

In order to gain new telephone subscribers nearly all telcos in the world have been solving copper cable shortage problem by means of Pair-Gain System installations. Pair-Gain Systems are widely installed in copper access networks and enable to connect multiple analogue telephone subscribers (POTS) over one copper pair. It is worldwide accepted solution thanks to the simplicity of usage and fast ROI.
However the solution with traditional Pair Gain system has one inherent problem which may show up very soon in exploitation period. The problem names Broadband Internet Access. Namely, telephone subscribers connected over traditional Pair-Gain Systems are limited to dial-up only Internet Access and can NOT get any type od xDSL Broadband Access.

Gradual TDM to NGN migration

IPS EMX-Nxx series of Pair-Gain system with integrated IP-DSLAM however overcomes the problem of Broadband Access. A 4-port mini IP-DSLAM is integrated in RT unit in order to provide Broadband Internet DSL access to 4 subscribers.

By installing EMX-N48 system telco is actually killing two birds with one stone. Multiplying existing cable capacity and buildingup IP infrastructure all the way into the residents’ premises. An EMX-N48 system with already built-in IP-DSLAM functionality allows telco to provide always-on Broadband Internet Access (fast Web browsing, e-mailing, exchanging files etc.) promptly on customer’s request.

EMX-N48 is recommended for new installations or for replacing already installed traditional Pair-Gain System. In both cases telco gets economical solution for expanding copper infrastructure and deployment of IP technology in last mile at the same time! Subscribers connected to IP-DSLAM ports of EMX-N48-S RT unit can be anytime up-graded from POTS-only telephone service to Broadband DSL data Access, just buy simple installation of CPE equipment at residence. It is best way for painless, gradual and scalable TDM to NGN migration. Installing EMX-N48 system with integrated IP-DSLAM is as simple as installing an ordinary Pair-Gain System! An easy job for every telco!

What is EMX-N48

EMX-N48 is an 8-channel Pair Gain System with a 4-port IP-DSLAM integrated in RT unit. It enables to connect up to eight (8) POTS subscribers over one copper pair, four (4) of them with Broadband Internet Access (DSL).

Technology used in EMX-N48

SHDSL technology is used to extend the reach from COT to RT unit and can ensure further loop extension by means of repeaters. SHDSL provides symmetrical or asymmetrical data transmission to all Broadband subscribers. TDM and/or IP technology is used for providing telephone (POTS) service. EMX-N48-S RT comes in two versions: in extremely small metal housing for installation in existing cabinets and in compact plastic outdoor housing for installations on poles and walls.

IP-DSLAM functionality

4 port remotely powered integrated mini IP-DSLAM with onboard splitters connects over one copper pair to SHDSL COT card at exchange side and provides up to four (4) DSL connections to CPE equipment at customer’s premises. It is designed to meet WT-101 requirements for Internet security. All subscribers are fully segregated in entire EMX aggregating structure. Tag-VLAN on per-port basis provides further segregation/association possibilities. PPPoE intermediate agent and DHCP relayagent (option 82) functionality may be used for preventing malicious Internet usage.

The EMX-N48 Equipment

Equipment at CO side

The equipment at CO side resides in standard 19'’ shelf UAR-x14 at CO premises (e.g. MDF). It consists of the following cards:

• Several COT SHDSL cards (up to 13 in one shelf): ................ EMX-E08-E (COT card)
• Aggregating switch (1 in each shelf) (option): ....................... EES-x16
• Telemanagement card (1 for several shelves) (option): .......... PNS-03

The equipment collects and aggregates IP and voice traffic from all RT units which are connected over SHDSL lines. Internet uplink connects with FE or GE to higher level L3 switch (e.g. Cisco 4506 or even some DSLAM’s FE or GE port). POTS telephone lines connect to PSTN switch via a/b wires (Z interface). On the other side each COT SHDSL card supports 2 SHDSL interfaces. Thus up to 26 RT units EMX-N48-S are supported by one UAR-x14 shelf. The COT units are powered from Central Office Battery (48 VDC).

Equipment at remote side

Equipment is installed on poles or walls, existing pole or wall enclosures or in existing street cabinets.

• Remote Terminal (RT) box: .................................................. EMX-N48-S (RT unit)

On one side RT connects to COT card via SHDSL over 1 copper pair. On the other side up to 8 telephone subscribers may be connected to one RT. Four (4) subscriber lines are provided via integrated IP-DSLAM ports and may be easily transformed into DSL lines for Broadband Internet Access by connecting CPE unit (DSL modem). Four lines are for POTS connections only (a/b wires). All IP-DSLAM ports feature integrated splitters.

Equipment at customer premises (CPE unit i.e. DSL modem)

Equipment is installed in customer’s residence in 1,2 km radius from RT unit (0,6 wire).

• CPE unit: ............................................................................. EMX-NT1

CPE unit connects to RT via twisted copper pair and provides 1 POTS interface and 1 Ethernet interface. One can connect to Ethernet interface: PC computer, Router, Eth. switch, VoIP gateway, VoIP phone etc. Any kind of POTS terminal (telephone terminals, analogue data modems, fax machines etc.) may be connected to POTS interface. The unit is powered from mains. Splitter is integrated. In case of power failure the POTS service is not disturbed (Lifeline ensured). Please note that no CPE unit is needed for connecting POTS terminal only to any of 8 subscriber lines.


Product Data Sheet

EMX-N48.pdf (1.920 kB)