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Clear Channel 6-Port T3 (DS3) Line Card Installation and Configuration
OL-3449-02
Chapter 1 Overview
Features
Features
The 6T3 line card provides the following features:
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Single-wide line card for the Cisco 7304 router
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Full-duplex synchronous serial DS3 interface
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High-Level Data Link Control (HDLC) data
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Integrated data service unit (DSU) functionality
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Support for 16- and 32-bit cyclic redundancy checks (CRCs)
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Support for Frame Relay, HDLC, and PPP serial encapsulations
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Support for DS3 MIB (RFC 1407)
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Support for remote and local loopbacks
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Six independent T3 ports
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Subrate DS3 support for Cisco, Kentrox, Larscom, and Digital Link formats along with the
associated scrambling. In some modes, the scrambling is optional.
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Clear-channel DS3 (framed but unchannelized)
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M23 and C-bit-parity DS3 frame formats
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Extraction of BOCs on the C-bit far-end alarm and control (FEAC) code
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Detects and counts remote alarm indication (RAI), parity errors, far-end block error (FEBE), line
code violation (LCV), loss of light (LOL), out of frame (OOF), framing errors, loss of frame (LOF),
loss of signal (LOS)
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One-second performance monitoring counters
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Generates AIS and FEAC
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Generates F-, X-, P-, and M-bit errors; LCVs; all zeros; RAI; and FEBE for testing
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Line, payload, and diagnostic loopbacks
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One bicolor LED per T3 port
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Drives up to 900 feet of 75-ohm coaxial cable RG-59U or equivalent, 450 feet to DSX-3
demarcation point (DSX)
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75-ohm SMB-type coaxial connections over ATT 734/728, 75-ohm coaxial cable
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B3ZS line coding
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Maintenance data link (MDL) messages
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Bit error rate testing