TMCnews Featured Article

GL Communications (News - Alert) Inc., a supplier of test, monitoring, and analysis equipment for TDM, wireless, IP and VoIP networks, has released its enhanced HDLC Link Impairment Utility (HLIU) application and other HDLC Testing Tools.

“HDLC is a Layer 2 ‘backbone’ protocol for reliable transport of data, voice, and video. It is used to encapsulate almost all other higher layer protocols such as ISDN, PPP, and Frame Relay. It is also used to encapsulate Ethernet frames over WAN links,” said Vijay Kulkarni CEO of the company, in a statement.

Kulkarni said that HDLC Impairment Utility impairs HDLC frames on T1 E1 lines, whether they occur on single timeslots at 64/56 kbps rate or as hyperchannels wherein contiguous timeslots are used to create N x (64/56 kbps) channels, with N possibly equal to the max timeslots of 31/30/24.

He said that the application can use any of GL’s T1 E1 platforms including T1 E1 Universal Cards, tProbes, USB T1 E1 Analyzers, and Octal T1 E1 Cards.

Kulkarni said that the application is useful in simulating real network conditions and the impact thereof on protocols such as ISDN, SS7, and other HDLC based protocols.

He said that it is also useful in verifying proper operation of HDLC hardware/software implementations.

“Impairments that can be introduced are: Logic Errors, CRC Errors, Drop a Frame, Change Order of Frames, Duplicate a Frame, Insert a Frame, and Delay a Frame. These impairments can be introduced manually or automatically with a specified random rate, e.g. 1x10E-04, or one in 10,000,” said Kulkarni.

TMCnet in January reported that GL Communications has introduced the addition of Channel Associated Signaling (CS) Protocol Emulator to GL's Message Automation and Protocol Simulation (MAPS) platform.

MAPS is a protocol simulation and conformance test tool that supports protocols such as SIP, MEGACO, MGCP, SS7, ISDN, GSM, MAP, CAS, LTE (News - Alert), UMTS, SS7 SIGTRAN, ISDN SIGTRAN, SIP I, GSM AoIP, Diameter and many others.