Tellabs 258X overview
Tellabs 258x Series E1 Echo Canceller Modules The 258 E1 echo canceller system is ideally suited for use in the public switched telephone network, as well as in digital wireless networks. In these networks, the 258 echo cancellers effectively remove hybrid echo caused by electrical coupling at 2-wir...
What is Tellabs 258X?
Tellabs 258x Series E1 Echo Canceller Modules The 258 E1 echo canceller system is ideally suited for use in the public switched telephone network, as well as in digital wireless networks. In these networks, the 258 echo cancellers effectively remove hybrid echo caused by electrical coupling at 2-wir...
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Manufactured byTellabs
Product groupModules
DescriptionTellabs 258x Series E1 Echo Canceller Modules
OverviewThe 258 E1 echo canceller system is ideally suited for use in the public switched telephone network, as well as in digital wireless networks. In these networks, the 258 echo cancellers effectively remove hybrid echo caused by electrical coupling at 2-wire-to-4-wire conversion points and acoustic echo generated from certain types of telephones. The 258 system uses state-of-the-art echo cancellation and nonlinear processing techniques to ensure that the subscriber’s call is echo-free, regardless of the source of the echo.The 81.2581 and 81.2582 E1 echo canceller modules provide adaptive, split-type echo control and connect directly to 2.048Mbps E1 Pulse Code Modulation (PCM) systems. The module can operate as a stand-alone unit monitoring the channel busy/idle status or can be controlled from a V.24-compatible Serial Communications Port (SCP). The module provides selectable A-Law/µ-Law operation.
Key Featuresfully compliant with International Telecommunications Union — Telecommunication Standardization Sector (ITU-T) recommendations G.165 and G.168 FLEXWARE™ performance options enhance Non-Linear Processor (NLP) control optional quality enhancements (see 258 E1 Echo Canceller System Release Notes, [part of the 258 Documentation Set, #80.4232] for further information) protects against echo caused by 2-wire-to-4-wire converters (hybrids) protects against echo caused by most analog mobile phones, including acoustical echo from analog hands-free systems greater than 35dB Echo Return Loss Enhancement (ERLE) typical (with 6dB Echo Return Loss [ERL] and receive input level = –10dBm0) for hybrid connections greater than 34dB combined ERL and ERLE within 50 milliseconds (ms) selectable 0, 3, and 6dB minimum ERL end path capability 32ms (2581 module) and 64ms (2582 module) (96 and 128ms optional) end path delay settings are available two V.24 SCPs support remote control and maintenance activities Dynamic Signal Transfer™ (DST) allows natural far-end background sounds to be heard for superior subjective performance Timeslot 16 control (for CEPT Multi-frame [MF] applications) idle code monitoring for busy/idle detection front access provisioning with optional 81.2581MC and 81.2582MC E1 master canceller modules optional High-Level Compensation (HLC) subassembly attenuates high transmission levels user-friendly front panel includes alarm and status LEDs automatic surveillance of idle channels and online performance monitoring enhanced alarm indications for easy network fault isolation loopback of PCM streams to enhance maintenance and fault isolation ITU-T recommendation G.704 Cyclic Redundancy Check-4 (CRC-4) compatible attenuates PCM phase jitter; see Section 9. ITU-T recommendation G.165 Data Tone Disabler (DTD) (requires 2 phase reversals) or ITU-T recommendation G.164 DTD built-in Signaling Tone Disabler (STD) supports ITU-T #5 signaling, ITU-T #6 and #7 Voice Path Assurance (VPA) check tones, Single Frequency (SF) (2600Hz), or 2280Hz low power requirements— 5.9W, typical at 48V (2581 module)— 8.8W, typical at 48V (2582 module) selectable A-Law or µ-Law PCM encoding user-friendly menus via RS-232 port for remote control utilizes flash memory for field upgrades or enhancements
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