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Digital testers for PCM and data applications up to 140 Mbit/s including mux/demux
Telecommunications
2854S/2855S Digital Analyzers
• PCM and data pattern generator and
error detector from 50 bit/s to
140 Mbit/s
• Demultiplex and hierarchical errors and
alarms monitoring
• Generate and monitor test patterns,
framed or unframed, at all hierarchical
levels within 8, 34 and 140 Mbit/s signals
• All data test interfaces as standard:
RS-232, X.21 (X.24), V.35, RS-449 (V.36)
(2855S), codirectional, contradirectional
with EUROCOM optional (2854S and
2855S)
• DS3 and LVDS test interface accessories
• Data interface and analog channel
access
• G.821, G.921, G.826, M.2100 and G.962
analysis
• Measurements include propagation
delay, frequency deviation, frequency and
level measurement, DTMF and CAS
• DC power and internal battery options
• Remote control via RS-232 or IEEE-488
with optional PC applications software
• 2850B and 2851 full functionality
The 2855S Digital Communications Analyzer
extends the capabilities of the 285X series of
analyzers to include support of the latest service
offerings from PTTs world-wide.
Testability from data communications interfaces to high speed digital
links and multiplexes at 2, 8, 34, and 140 Mbit/s in a single
portable and battery operated unit provides unrivalled flexibility for
support of modern digital and data networks and equipment. The
2854S Digital Transmission Analyzer provides most of this functionality
but limits the data test capability to Codirectional and Contradirectional
interfaces.
This Data Sheet, therefore, contains only those capabilities and
specifications which are incremental to 2850B and 2851.
PCM Framing Systems
2854S and 2855S are able to generate and receive all commonly used
framing systems up to 140 Mbit/s for the European digital hierarchy.
North American rates are also available to 6 Mbit/s.
The instrument can be optioned as European or hybrid versions, and
this includes a mixed rate version (European plus North American).
Thus 2854S and 2855S have the flexibility to address global applications,
including operation in International Gateways where there is a
requirement to test mixtures of European and North American traffic
carried on satellite systems.
56 kbit/s and 64 kbit/s Channel Testing
Individual channels within T1, 704, 2048, 8448 (G.704/G.744 and
G.742), 34368 and 139264 kbit/s can be tested at 64 or 56 kbit/s,
assisting in testing and fault location within digital data networks and
cross-connect switches.
n x 64 kbit/s Channel Testing
The expanding services at n × 64 kbit/s can be tested where they are
carried within T1, 704, 2048, 8448, 34368 and 139264 kbit/s digital
signals. All systems and n × 64 kbit/s cross connect switches are
catered for with the flexibility of contiguous and non-contiguous
channel selection.
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