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61200375L1-1

TA 850

TA 850 SDSL RCU UIG/61200377L1-31A

Page 13 of 76

1. SDSL RCU MODULE OVERVIEW

The SDSL Router Control Unit is a dual board assembly that includes an SDSL network interface, Nx56/64 V.35 in-

terface, and built-in IP router. The SDSL RCU can provision, test, and provide status for any card in the channel bank.

The faceplate has a DB-9

CRAFT

port connection, and network, V.35, and Ethernet LEDs.

The SDSL RCU is only used in ATM applications. It supports vendor-specific SDSL protocols, ATM, and Copper-

Mountain Frame Relay. Therefore, the SDSL RCU can interoperate with a variety of DSLAMs, including Lucent,

Nortel, Copper Mountain, Nokia, and Alcatel. It also supports CopperCom, Jetstream, and Tollbridge Voice Gateways.

The SDSL RCU has built-in Echo Cancellation for up to 24 voice ports. Adaptive Differential Pulse Code Modulation

(ADPCM) resources are also built-in for up to 16 ports.

To update firmware for the SDSL RCU, use XMODEM transfer protocol via the base unit’s

CRAFT

port or use TFTP

from a network server. (See Appendix A. Updating TA 850 Firmware using XMODEM on page 55 and Appendix B.

Updating TA 850 Firmware using TFTP on page 59.)

The terminal menu is the access point to all other operations. Each terminal menu item has several functions and sub-

menus that identify and provide access to specific operations and parameters. These menu selections are describedlater

in this User Interface Guide.

2. VOICE OVER DSL OVERVIEW

Voice over DSL (VoDSL) refers to providing toll quality voice access to the Public Switched Telephone Network

(PSTN) over twisted copper pair using DSL. Data can be combined with multiple voice lines over a single medium via

DSL, thus yielding many advantages over traditional TDM technologies.

Traditional TDM technologies are limited by statically allocating bandwidth. DSL overcomes this by providing a large

bandwidth and utilizing other technologies, such as ATM, to dynamically assign bandwidth as it is needed. Because

of this, the user is able to add voice and data connections over a DSL line with flexibility and ease.

3. VOICE OVER ATM OVERVIEW

Voice over ATM is the technology used to transmit voice conversations over a data network using Asynchronous

Transfer Mode (ATM). There are several potential benefits to moving voice over a data network using ATM. First, the

small, fixed-length cells require lower processing overhead. Second, these small, fixed-length cells allow higher trans-

mission speeds than traditional packet switching methods.

Only the first two dipswitches on the RCU are used. With the first dip switch down (to the right of

the unit if you are facing it), the unit boots up in a mode to update the firmware. With the second dip

switch down, the unit factory defaults at startup.

See Appendix C for instructions about navigating the terminal menus.

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ADTRAN 850 Bedienungsanleitung Seite 13