ADTRAN Total Access 3000 - Page 49

6TASYS101-1E
TOTAL ACCESS 3000/3010
SYS-101
Page 43 of 46
Total Access
®
3000/3010 System Manual
© 2003, ADTRAN, Inc.
5.2.4 Optical Delivery of Four T1s
The QFO-C provides economical transport for up to four optical DS1 signals and
offers a cost-effective alternative to costly, full-featured fiber multiplexers in many
applications. Applications for QFO-C include customer DS1 services, DS1 entrance
links to wireless/PCS cell sites, and feeder facilities for medium capacity DLC
systems. The system can be provisioned for unprotected or 1:1 protected operation that
includes the optical facility as well as the multiplexing electronics.
Features such as compact size, extended temperature operation, TL1 alarm OS
messaging, up to 22 dB optical power budgets, and wide dynamic range optical
receivers make the QFO-C the most versatile low-capacity fiber multiplexer system on
the market.
The QFO-R is designed with a built-in DS1 Network Interface Unit (NIU) for each
DS1 circuit, eliminating the need for separate NIUs at the remote end for maintenance
loopback testing. This provides substantial cost savings over other systems. The
QFO-C automatically accommodates all DS1 formats including SF, ESF or unframed,
plus B8ZS or AMI line coding. These formats are accommodated without special
provisioning or setup, vastly simplifying installation and turn-up. See Figure 23.
Figure 23. QFO-C System Arrangement
Four T1 Circuits
Optical
DS2
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Total Access 3000/3010