DSLAM

1
DSLAM

• Digital Subscriber Access Multiplexer

2
Definition

• A DSLAM is a Network Device, usually placed
  at a Telephone Company Central Office, That
  Receives Signals from multiple customer of DSL
  Connections and puts the signals on a high-speed
  backbone line using Multiplexing Techniques.
• DSLAM multiplexers connect DSL lines with
  some combination of Asynchronous Transfer mode
  (ATM), Frame Relay, or Internet Protocol
  Networks.
• DSLAM enables a phone company to offer
  business or home users the fastest Phone Line
  Technology (DSL) with the fastest backbone
  Network Technology (ATM).

3
DSLAM Application Overview
Multimedia Conference
Video Phone
IP Centrex

Voice-Email

Public Phone
DSLAM
WLAN
IAD
xDSL Modem
Home gateway
Multimedia Terminal
Consumer end user/Soho
Business end users
4
DSLAM Evolution
NGN
DSLAM Evolution
IP Core Full-Service Full-Service Access
Platform
IP Core DSLAM
ATM Core DSLAM
3G
2G
1G
Time
5
ATM IP

• Technology Adopted by DSLAM equipment including
  ATM and IP
• ATM uplink rate --155Mbit/s
• IP uplink rate--100Mbits/s,1000Mbits/s (Ethernet)

6
Differences between ATM DSLAM and IP DSLAM

• ATM DSLAM uplink ATM / Ethernet switch or BAS
• IP DSLAM uplink Ethernet switch or BAS
• ATM DSLAM ATM cell ended on uplink board(if ip
  uplink)
• IP DSLAM ATM cell ended on subscriber
  board
• ATM DSLAM internal switch based on ATM
• IP DSLAM internal switch based on IP

7
Example of ZTE Broadband Access Accessories
1G ATM Series
Terminal 831/831A/831D/832/852
PURE DSLAM series
CPE series
2G IP Series
3G FSAP series
ZXDSL8220
Outdoor
ZXDSL 9210
732/931/531
ZXDSL 8203
ZXDSL 9203
ZXDSL 8426
FSAP 9800
Out30 for Big capacity DSLAM
ZXDSL 9426
FSAP 9803
ZXDSL 9806E/A/H
Out50 for medium capacity DSLAM
for mini DSLAM
8
Theory of ADSL
PSTN
ADSL Modem
Splitter
DATA Switch
DSLAM
9
FSAP/DSLAM Family Overview

• Large capacity
• Medium capacity
• Mini capacity

10
Large Capacity
9U 896L ADSL per Shelf 672L VDSL per Shelf 448L
SHDSL per Shelf 14 EPON Interface 8 GPON Interface
Line interface card 32/64L ADSL 48L VDSL
32L SHDSL EPON/GPON
-48VDC
CSC 2/4/6 100M/1000M 10GE, Uplink Interface
600mm600mm, 19inch ETSI standard rack
11
Shelf Structure
Subscriber Shelf
Splitter Shelf

• Shelf Height 9U Rack Used 6006002200
• 2 Shelves per Rack with Splitter 3 Shelves per
  Rack without Splitter

12
Shelf Configuration

• Mode 1 Holding subscriber cards without built-in
  splitters and splitter cards together,
  implementing broadband data service and
  narrowband voice service access at the same time.

13
Shelf Configuration

• Mode 2 Holding subscriber cards with built-in
  splitter cards only, implementing broadband data
  service and narrowband voice service access at
  the same time.

14
Shelf Configuration
15
Backplane of DSLAM

• Subscriber shelf supports three backplanes
• MDCA Supports broad/narrow-band integrated
  service access
• Mechanical support for all cards and works
  with the control and switch card
• MDCE Supports pure broadband service access
• MDCF Backplane works with the control and switch
  card to supports larger bandwidth, each slots
  bandwidth reaching up to 4 GE. Provides two 10G
  interface uplink slots.
• Splitter shelf supports only one backplane e.g.
  MTAN.

16
CSC Board Feature

• The CSC board resides in slot 9 and 11.The CSC
  board cannot reside in other slots.
• Height 9U
• Core of switching and controlling for the system,
  providing a series of ports and powerful
  switching capability on the backplane.
• DSLAM can be configured with one single CSC card
  or dual active/standby CSC cards. When the active
  and standby CSC cards are running, the standby
  CSC card performs hot backup for the active CSC
  card.

17
ATNG CARD Feature

• Implementing the conversion between the ATM and
  the Ethernet
• Provide 32 lines of ADSL access for subscribers.
  The subscriber data
• are transferred through PSTN networks.
• Built-in splitter
• Provide LED indicator, 32 link LED indicators,
  sockets, and
• reset button

18
System Feature Overview

• DSLAM can Integrating Data, Voice and Video
• Carrier-Class Reliability
• Hot-swap of Subscriber Boards
• Many Service Interfaces (ADSL/ADSL2/ADSL2/
  SHDSL/ VDSL2/EPON/GPON)
• Multicast Feature (MVLAN,CAC,PRV,CDR,IGMP v2)
• Full DiffServ Mode QoS for Triple-Play
• Multiple Maintenance Modes (CLI, Telnet, SNMP)
• CPE Remote Management

19
Base Capacity Features

• Supporting 16K MAC
• Supporting 4K VLANs
• Supporting 255 1K IP Multicast Groups
• Supporting 512 Traffic Classes
• Supporting 128 QoS Policies

20
Cascading
CO Mode
Large Capacity
3km
3km
ZTE FSAP 9800/9803 CASCADING
Medium Capacity
ZTE FSAP 9806H
ZTE FSAP series products application in various
distance area
21
FSAP EPON / GPON Application
Internet
OSS
IPTV
IP NETWORK
10 Km
ADSL VDSL FTTX LAN
DSLAM
1x32
BRAS
OLT
Other Application
ONU
1x16
20 Km