Service Flow

The following introduces some of the most typical service flows of the MA5100.

3.2.1 xDSL Access Service Flow

The MA5100 provides ADSL and SHDSL accesses. Figure 3-2 shows the service flow.

MA5100/5103

MMX

ADSL

FE/GE

SHDSL STM-1

LAND

ATU-R STU-R

ATM/IP

Figure 3-2 xDSL access service flow

I. Upstream

z ADSL/SHDSL (ATM-based) receives the xDSL signals from ATU-R/STU-R;

z ADSL/SHDSL converts the xDSL signals into ATM cell flow;

z In the case of ATM-DSLAM network, ATM cell flow is sent to MMX, then to the upper layer ATM network through the ATM interface, and implements ATM-DSLAM application;

z In the case of IP-DSLAM, the ATM cell flow is sent to LAND where it is converted into Ethernet frame, then sent to the upper layer IP network through the IP interface on the LAND. In this way, the IP-DSLAM application is implemented.

When congestion occurs in the network, LAND can dispatch the upstream Ethernet frame based on the set 802.1p priority level, thereby ensuring the IP service QoS.

II. Downstream

z In the case of ATM-DSLAM, xDSL service data (in the form of ATM cell flow) are sent to the MA5100 through the uplink interfaces on MMX. The xDSL service data are converted into ATM frames by the MMX, and sent to xDSL;

z In the case of IP-DSLAM, the xDSL data (Ethernet frame) is sent to LAND, then sent to MA5100 through the upstream interface on the LAND. Land converts Ethernet frame into ATM frame and sends xDSL through its cell bus. When congestion occurs in the network, LAND can dispatch the downstream Ethernet frame based on the set 802.1p priority level, thereby ensuring the IP service QoS.

z After being processed by xDSL, ATM cell flow is converted into xDSL signals, and sent to the remote ATU-R/STU-R.

3.2.2 LAN Leased Line Access Service Flow

Figure 3-3 shows the service flow of LAN Leased Line Access Service.

Technical Manual

SmartAX MA5100/5103 Multi-service Access Module Chapter 3 Functions and Service Flow

MA5100

MMX

LAND

FE/GE

LAND STM-1

LAND ATM/IP

FE FE

Figure 3-3 Service flow in LAN leased line access

I. Upstream

z The Ethernet frames from the LAN subscriber are sent to the LAND (LAND works in leased line access mode) through the FE port interfaces;

z Ethernet frames are converted into ATM cell flow on the LAND and sent to MMX/LAND (LAND works in IP-DSLAM mode);

z ATM cell flow is processed by MMX/LAND and sent to upper layer ATM/IP network.

II. Downstream

z LAN service data are sent to the MA5100 through the uplink interface on MMX/LAND;

z After the process on the MMX/LAND, the LAN service data are converted into ATM cell flow and sent to LAND;

z After the process on the LAND, the ATM cell flow is converted into Ethernet frame and sent to the LAN subscriber.

3.2.3 Multicasting Service Flow

The MA5100 supports IP-DSLAM and ATM-DSLAM multicast services, as shown in Figure 3-4:

MA5100

MMX

xDSL

STM-1

LAND ATM/IP

xTU-R

FE/GE Program server

IGMP packet and multicast control message

Video frequency stream

Figure 3-4 Multicast service flow

z When an xDSL subscriber selects a multicasting program, the subscriber terminal sends IGMP packet to the MA5100 and requests to be added into the multicast group for the program;

z The LAND on the MA5100 receives the IGMP packet and sends the subscriber information to MMX;

z MMX authenticates the subscriber. If the subscriber has the authority, MMX shall send a confirmation to the LAND, so that the xDSL port of the subscriber can be added into the multicast group;

z In IP-DSLAM application, LAND receives the video stream from the video server, and broadcasts it to all the xDSL ports; in ATM-DSLAM application, MMX shall send the video stream to the LAND, and the LAND shall broadcast the video stream to all the xDSL ports;

z If the xDSL port belongs to the multicast group, the video stream shall be received and sent to the subscriber; if the port does not belong to the multicast group, the video stream shall be discarded;

z When the subscriber logs off, the subscriber terminal sends an IGMP packet to inform the MA5100;

z When the LAND detects the IGMP packet, the message is forwarded to the MMX, which controls the xDSL to remove the subscriber xDSL port from the multicast group;

z LAND is able to send IGMP packets to all the multicast subscribers regularly in order to query the state of the subscribers, and maintain the multicast group according to responses from the subscribers.

Technical Manual

SmartAX MA5100/5103 Multi-service Access Module Chapter 3 Functions and Service Flow

3.2.4 ISU Service Flow

The MA5100 supports built-in ISU for authentication, authorization and accounting of the online subscribers. Figure 3-5 illustrates the ISU service flow in which the subscriber logs in through ADSL port.

MA5100

ISU

ADSL

FE/GE

LAND

ATU-R IP network

FE

ADSL service flow

Authentication, accounting flow

Figure 3-5 ISU service flow

z When the subscriber establishes the connection with the ISU through PPPoE or other modes, the subscriber information is sent to the ISU;

z ISU authenticates the subscriber. If the subscriber cannot pass the authentication, the login request will be rejected; if the login is successful, ISU starts accounting on the subscriber;

z The service data from the subscriber are forwarded to ISU through ADSL and LAND, and accessed to the IP network through the uplink FE/GE interface on the ISU;

z When the subscriber logs off, ISU stops the accounting.

3.2.5 Broadband Test Service Flow

The MA5100 supports built-in broadband test module (BTSB) to detect the state of the xDSL lines.

MA5100

MMX

ADSL

FE/GE

LAND IP/ATM

BTSB

STM-1

Figure 3-6 Broadband test service flow

z The test system (such as the NMS, carrier’s test system or the maintenance terminal) sends the test instruction to the MA5100 through the IP/ATM network;

z In ATM-DSLAM networking, MMX receives the test instruction, then controls the ADSL board to grasp the line, and controls the BTSB to test the line, and reports the test data to the test system;

z In IP-DSLAM application, LAND forwards the test instruction to MMX directly, which controls the BTSB and ADSL board to complete the test, and reports the data to the test system;

z The test system analyzes and processes the data, and then displays the result.

Technical Manual

SmartAX MA5100/5103 Multi-service Access Module Chapter 4 Maintenance Management System