Aeroflex 2854S/2855S Digital Analyzers - AEROFLEX - #4

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EXTERNAL VOICE and DATA For framed and multiplex operation, an externally input 64 kbit/s data stream or a voice frequency signal can be inserted into one of the channels in the transmitted signal instead of a test pattern. Data Input Applies to frame structures at 704, 1544, 2048 and 8448 kbit/s (G.704/G.744). Applies to 2048 kbit/s tributaries within frame structures at 8448 kbit/s (G.742), 34 and 140 Mbit/s (G.751) and 8448 kbit/s (G.744) tributaries within 34 and 140 Mbit/s. Data Input Interface Codirectional to G.703 Contradirectional to G.703 (AMI 100% or Bipolar NRZ) X.21, RS-449 (V.36), V.35 (using DCE adaptor cable accessory) NRZ (TTL level) VOICE FREQUENCY INPUT Applies to frame structures at 1544 and 2048 kbit/s Applies to 2048 kbit/s tributaries within frame structures at 8448 kbit/s (G.742), 34 and 140 Mbit/s (G.751) Range 0.3 to 3.4 kHz Encoding A-law for 2048 kbit/s ì-Law for 1544 kbit/s Impedance 600 Ù balanced Max Input Level +3 dBm0 ERROR INJECTION 34 and 140 Mbit/s Target Test Pattern Framing Error Type Binary Bits are inverted before coding Code Code errors are injected by changing ±1 to 0 and 0 to ±1 where the polarity of the inserted mark is the same as the polarity of the last mark transmitted. There is no injection into CMI line code at 140 Mbit/s. Injection Mode Singly By keypress Fixed rate 34 Mbit/s 3×10-2 to 1×10-8 (pattern and code) 3×10-2 to 1×10-7 (frame) 140 Mbit/s 3×10-3 to 1×10-9 (pattern) 3×10-3 to 1×10-7 (frame) ACCESS TO STRUCTURE BITS 34 and 140 Mbit/s Frame alignment strategy Change unassigned, distant, and alarm bits PCM RECEIVER INTERFACE FRAMING AND BIT RATES As Transmitter Permitted combinations of bit rates As Transmitter Frequency Tolerance As 2850B, 2851 PLUS 34368 kbit/s ±60 ppm 139264 kbit/s ±60 ppm LINE CODES As Transmitter DIGITAL INPUT Connector BNC Impedance 75 Ù unbalanced NRZ DIGITAL INPUT 34 and 140 Mbit/s Unframed only Frequency Range 6 to 160 Mbit/s Level TTL or ECL to 50 Mbit/s, ECL above 50 Mbit/s Connector Data - main digital output BNC Clock - BNC on rear panel INPUT MODES AND SENSITIVITY 34 and 140 Mbit/s Terminated Terminates the line Sensitivity ±1 V (34 Mbit/s), ±0.5V (140 Mbit/s), nominal +3 dB -12 dB cable attenuation +3 dB -18 dB linear attenuation Monitor Connects to a protected monitor point Sensitivity Nominal attenuation of 15, 20, 26 and 30 dB +3 dB -6 dB cable attenuation +3 dB -12 dB linear attenuation