ADTRAN Express 5210, Руководство пользователя

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Chapter 1. Introduction
1-2 Express 5210 User Manual 61200208L1-1
This DLCI is valid until the call is disconnected and may be
assigned a different value each time a call is requested.
PRODUCT OVERVIEW
The ADTRAN Express 5210 is a standalone frame relay access
device (FRAD) that provides a cost-effective means of transporting
voice and multi-protocol data over frame relay or DDS networks.
The Express 5210 provides an easy-to-use interface for customers
migrating existing services or developing new applications for
operation over frame relay networks.
The Express 5210 provides high-quality voice and fax capabilities
to remote locations without expensive toll charges. In frame relay
networks, the Express 5210 allows voice and data to share the same
PVC, eliminating unnecessary PVC charges associated with other
vendors’ voice and data frame relay products. Two voice ports are
provided when configured with a voice option card. Options
include: Dual FXS, Dual FXO, and Dual E&M.
The Express 5210 provides a DTE interface for connecting a non-
frame relay device to the frame relay network. This port can be
configured for either EIA-232 or V.35 signal specifications.
Synchronous protocol speeds up to 512 kbps and asynchronous
protocol speeds up to 57.6 kbps are supported. See the appendix
Pinouts on page A-1 for the pin assignments.
The Express 5210 handles each frame of the user data in a three-
step manner. The first step is terminating the user protocol. The
layer at which this termination occurs varies, depending on the
user protocol selection for a given port. The next step is examining
the user protocol destination address and routing to the destination
port and virtual circuit. The last step involves encapsulating the
information field of each frame and re-encapsulating based on the
destination port configuration. A similar process is used for frame
relay frames received on the network port.
The major features of the Express 5210 are as follows:
• Dual voice port support; options include Dual FXS, Dual FXO,
and Dual E&M