The TTC/Acterna 211 is a portable T-Carrier analyzer for installation, acceptance, and maintenance of T1 and T1C transmission systems. It delivers comprehensive error analysis, jitter measurement, and pulse shape evaluation—critical for central office, field, and troubleshooting applications. The 211 combines automated stress pattern testing with CSU/NIU emulation to isolate faults and verify circuit performance against G.821 standards.
Technical Specifications
-# Measurement Capabilities
• Error analysis per G.821 specification; captures unavailable seconds, percent availability, degraded minutes, percent degraded minutes, severely errored seconds, and percent severely errored seconds
• Jitter measurement (highband and wideband) across 10 Hz to 40 kHz range to identify multiplexer and channel bank clock problems
• Pulse shape analysis to verify transmit signal adherence to customer premise and network equipment specifications
• Wander measurement
• BERT (Bit Error Rate Testing) analysis
• B8ZS detection with front panel indicator and ALL ZEROS stress pattern
• Fractional T1 (FT1) error analysis
-# Operating Modes and Test Patterns
• Operating modes: Self Test, Automatic Configuration, T1 Unframed, T1 D4 Framed, T1 ESF Framed, T1 SLC Framed
• Test patterns: All Ones, 1:1, 1:7, 2 in 8, 3 in 23, QRSS (T1 and T1C), 2^15 -1, 2^20 -1, 2^23 -1, User Pattern 1 (3–24 bits), User Pattern 2 (3–24 bits), BRIDGTAP pattern sequence, MULTIPAT pattern sequence, All Zeros
• Automated multipattern testing and BRIDGTAP stress patterns for bridge tap detection
-# Interface and Input Specifications
• Bridge input impedance: >1000 ohms with ALBO
• Terminate input impedance: 100 ohms with ALBO
• DSX-MON input impedance: 100 ohms with AGC
• Receive level (Bridge/Term): +6 dBdsx to −35 dBdsx (T1); +3 dBdsx to −6 dBdsx (T1C)
• Receive level (DSX-MON): +6 dBdsx to −24 dBdsx (T1); +3 dBdsx to −24 dBdsx (T1C)
– Key Features
Jitter alarm and trigger functionality enable rapid identification of clock recovery issues. CSU/NIU emulation isolates customer premise and network equipment during installation and maintenance. User-configurable patterns and automated stress sequences accelerate fault location and circuit verification.
– Typical Applications
T1 line installation verification, transmission system acceptance testing, circuit troubleshooting, central office maintenance, and field diagnostics for T-Carrier networks.
– Compatibility & Integration
Supports T1 and T1C transmission systems in both framed and unframed configurations. Compatible with B8ZS-encoded circuits and fractional T1 deployments.
