SSU-2000 Shelf Specifications
442 SSU-2000 User’s Guide 12713020-002-2 Revision D – April 2004
Power Input and Grounding Specifications
Table F-4 provides power input specifications.
Input Signal Specifications
Table F-5 details the input signal specifications.
Table F-4. Power Input Specifications
Parameter Specification
Supply power
–38 to –72.2 Vdc (–48 Vdc nominal)
1, 2, 3
Power, maximum < 240 watts at power on
Power, typical < 100 watts at normal operation
Connector #6 Ring Terminal Block
1. Reversing the input polarity does not damage the unit.
2. Isolated power inputs are user-settable for positive or negative grounding schemes.
3. The 48 vDC return is connected to the common ground plane at power source.
Table F-5. Input Signal Specifications
Parameter Specification
DS1 Signals
Framing D4/SF or ESF (User Selectable)
Bit Rate 1544 kbit/s
Format AMI or B8ZS (per (ANSI) T1.102 & ITU-T G.703 Sec. 5)
Amplitude Range +3 to –24 dBDSX
Jitter and Wander Tolerance
Meets the requirements of Bellcore GR-1244-CORE, Section 4.
Input Error Threshold 0 to 255 Intervals per hour (AIS, LOS, OOF, BPV, CRC)
Input Impedance 3.3 kΩ (External termination)
E1 Signals
Type G.703 Sec. 9 Framed E1
Bit Rate 2048 kbit/s
Format CAS or CCS (per ITU-TG.703 Sec. 2 & (ANSI) T1.102 DS1A CRC4
enabled/disabled AMI or HDB3)
Amplitude Range +3 to –27 dBTLO
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