Table of Contents
Advertisement
DataComm 551
FEATURES
DESCRIPTION
SECTION 1
INTRODUCTION
• Auto Framing adapts the DataComm 551 automatically to Extended Su-
perframe Format (ESF) or D4 Superframe Format on both the customer
equipment and the network sides
• Supports both Alternate Mark Inversion (AMI) and Bipolar with 8 Zero
Substitution (B8ZS) line codes, and allows a variety of options for ones
density in the data stream
• Supports both AT&T PUB 54016 and Bellcore TR-TSY-000194 (ANSI)
procedures for the collection and monitoring (via the Supervisory ter-
minal) of the network TABS Maintenance Messages and Performance
Report Messages provided by the Central Office
• Provides two independent register sets for TABS performance data so
that the user set is unaffected when the Central Office clears the net-
work set
• Link-level (DS1) and channel-level (DS0) diagnostics provide exten-
sive diagnostic capabilities
• Supervisory terminal provides software-control of configuration, diag-
nostics, and maintenance
• Supports GDC's PMC-100 Performance Monitor Card for enhanced, cen-
tralized network control
The DataComm 551 Intelligent Channel Service Unit (CSU) provides the
interface between the customer's 1.544 Mbps T1 equipment (e.g., one of
GDC's
MEGASWITCH®,
plexers) and the T1 digital carrier facility provided by the Telco or other
carrier. The DataComm 551 provides the normal CSU functions of net-
work interfacing and protection, as well as a host of other flexible and
powerful features, including:
• The DataComm 551 can be pre-equalized for line lengths of up to 655
feet (199.6 m) on the customer equipment side.
• The DataComm 551 can perform automatic Line Build-Out (signal at-
tenuation) of 0, 7.5 , or 15 dB at 772KHz on the network side.
1-1
MEGAMUX®,
or MEGAMUX PLUS multi-
Advertisement
Table of Contents
