Record, Analyze and Transmit HDLC Data Non-Intrusiv e Analysis Using GL’s T1/ E1 Analyzers Suppor ts LA PF, LAPD, LAPD+IP, LAPX+IP Protocols Summary, detail, hex-dump, and statistic views Search & filtering capabilities Real-time & Offline analysis HDLC Playback Option for Recorded Trace Files HLI U to inject errors and simulate real-time network Statistics based on frame- count, byte-count etc HDLC Analysi s/Playback/Simul ation Overview The HDLC is a protocol, which operates at the data link layer specifies data packets standard for serial links. The HDLC protocol embeds information in a data frame that allows devices to control data flow and correct errors. HDLC data is formatted into frames. A frame of data is encapsulated by flags. The beginning and end of an HDLC frame are marked by flag characters - 01111110 binary. At the end of the frame, a Frame Check Sequence (FCS) is used to verify the data integrity. The FCS is a CRC calculated using polynomial x^16 + x^12 + x^5 + 1. Idle periods in the dat a channel contain only flags. GL’s HDLC protocol analyzer provides the capability to capture, and analyze HDLC data on a full duplex T1 or E1 line. It supports the following types of HDLC analyzers: • Real-time HDLC Analyzer (Pre-requisit es: GL's field proven E1 or T1 internal cards or Laptop E1 or T1 external units and Windows 2000/XP Operating System) • Offline ISDN Analyzers (Pre-requisites: Windows 2000/XP Operating System) In addition, GL offers HDLC Playback, HDLC Impairment Utility, and HDLC Tx/Rx Test applications. These applications further help in transmitting and capturing pre-defined HDLC frames. Main Features • Supports Real-time as well as off-line analysis. • Displays Summary, detail, hex-dump, statistics, and call trace views. • Summary view displays LAPD, LAPF specific information and IP information like source/destination IP address, TCP source port, TCP destination port etc. • Detailed view displays easy to understand decodes of user selected frame. • Hex dump view displays the frame information in HEX and ASCII format. • Statistics view displays statistics based on frame count, byte count, frames/sec, bytes/sec etc for the entire captured data. • Supports filtering and search features based on C/R, SAPI, TEI, CTL, P/F, N(S), N(R) and FUNC. • Recorded trace files can be played back using HDLC playback option. • Simultaneous decode of multiple streams of HDLC on same T1/E1. • Streams can be captured on the selected time slots (contiguous or non-contiguous), sub- channels or full bandwidth. Frames can be transmitted/capt ured in either n x 64 kbps, or n x 56 kbps data channels (hyper-channels). • Remote monitoring capability using GL's Network Surveillance System. • Exports summary information to a comma delimited file for subsequent import into a database or spreadsheet. 207A Perry Parkway, Suite One. Gaithersburg, MD 20877 (V) 301-670-4784 (F) 301-670-9187 Web Page Address: http://www.gl.com/ E-Mail Address: [email protected]