User Reference and Installation Guide
2-16
© 2006 Microwave Data Systems Inc.
All Rights Reserved.
MDS
Digital Radio
Series
05-4561A01, Rev. A
SDIDU
TM
interfaces with the ODU to receive and provide modulated transmit and receive
waveforms.
The SDIDU
TM
also provides the physical interface for the user payload and network management.
In transmit mode, the Framer merges user payload with radio overhead-encapsulated network
management data. This combined data stream is transmitted without any loss of user bandwidth.
In the receive mode, the Framer separates the combined data stream received from the 64-QAM
Modem. The SDIDU
TM
supports Scalable Ethernet data rates, such as 25 or 50 Mbps via the
100BaseT data interface port. The SDIDU
TM
provides network management data on 10 Mbps
ports accessible via the 10/100BaseTX port. The Central Processor Unit (CPU) provides the
embedded control and network element functionality of the NMS. The CPU also communicates
with other functions within the SDIDU
TM
for configuration, control, and status monitoring.
In Ethernet models, the payload of each user Ethernet data packet and all T1 can be encrypted
using an AES encryption algorithm. In addition, the encryption engine is re-seeded with a new,
randomly generated key stream every 10 seconds, in order to provide enhanced security. The
initial key is based off of a pass phrase entered into each Digital Radio Series unit by the network
administrator. Consult factory for the availability of this encryption function.
The power supply converts -48 Vdc to the DC voltage levels required by each component in the
system.
2.6 Consecutive Point Architecture
The consecutive point network architecture of the Digital Radio Series is based upon the proven
SONET/SDH ring. Telecommunications service providers traditionally use the SONET/SDH ring
architecture to implement their access networks. A typical SONET/SDH network consists of the
service provider’s Point of Presence (POP) site and several customer sites with fiber optic cables
connecting these sites in a ring configuration (see
165H 162H
Figure 2-5). This architecture lets providers
deliver high bandwidth with high availability to their customers.
Summary of Contents for FOUR.9 Series
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