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