TDM TEst Solutions

T1 E1 Testing

Portable USB T1 E1 Analyzer

GL's USB based T1 E1 Analyzer is a compact, full featured, and complete BERT, voiceband, data, signaling, and protocol analyzer.

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Complex T1 E1 testing just got simpler with GL's portable USB based T1 E1 analyzer.

GL's USB based T1 E1 Analyzer is a compact, full featured, and complete BERT, voiceband, data, signaling, and protocol analyzer. The USB T1E1 analyzer is a USB-Based T1 and E1 solution provide comprehensive and versatile T1 or E1 testing capability.

Increased Performance with 64-bit Support

GL’s T1/E1 analyzers supports both 32-bit and 64-bit applications. 64-bit support improves the performance of Protocol Analysers viz., ISDN, ISUP, GSM and allow users to monitor Hundreds to Thousands of Signaling Links simultaneously and continuously. Also, provides improved processing and response time for Statistics, Call Data Records, Search and other such functions.

Enhanced CCA application allows better processing and response time for multiple instances of CCA applications for long run tests. Similarly, all basic Intrusive and Non Intrusive applications such as BERT, Monitoring Applications, Oscilloscope, Spectral Display etc provide better processing and response time for multiple instances of monitoring and simulations windows.

MAPS™ Protocol Emulators are enhanced to provide improved performance for load generation and simulation of Protocols on 16 T1/E1 ports simultaneously.

Client Server commands support Thousands of Tasks simultaneously with number of successful thread creation. This helps to run Tx Rx File, Tx and Rx Tone and Tx Rx Digits on 24/31 Timeslots * 8 Ports * n (where n is the number of Portable USB T1 E1 Cards)


It is introduced with the following enhancements

  • Lightweight (less than 2 lbs) and small footprint (5" x 4" x 1.5")
  • The unit's lightweight and small footprint make it easy to carry in the pouch of a Notebook PC making it perfect for air travel. Compatibility with any Notebook PC allows the software to be installed on many PCs - just ship the unit to the intended location and use an available PC.
  • Software Selectable T1 or E1 interfacing along with Drop and Insert
  • Two (2) port and four (4) port captures of T1 and E1 signals with one or two USB T1 E1 Analyzers connected to a single PC 
  • Portability: Converts a Notebook or Desktop PC into a powerful T1 E1 test instrument
  • USB 2.0 interface for complete access to T1 E1 rate signals 
  • Voice Frequency (VF) Drop and Insert: Besides providing access to in-band PCM data, the T1 (E1) provides VF interface for monitoring and inserting audio with Drop and Insert. 
    Users can connect to VF ports using 3.5mm unbalanced (or mono) audio cable, with standard 600 Ohms termination mode only.
  • VF Tx Gains for USB T1 E1 analyzer ranges from -7.2 dB dB to +18.2 dB in 0.1dB steps, and VF Rx Gains for USB T1 E1 analyzer ranges from -18.0 dB to +7.3 dB in 0.1 dB steps.
  • Monitor the T1/E1 line conditions such as frame errors, violations, alarms, frequency, power level, and clock (or frame/bit) slips.
  • Support for all  "basic applications" and "special applications
  • Physical layer analysis includes ability to send alarms and errors via SNMP Traps
  • All protocol analyzers now include frame length in protocol statistics selection choice for data link layer
  • Comprehensive Analysis / Emulation of Voice, Digits, Tones, Fax, Modem, Raw Data, Protocol, Analog, Digital, Echo and Voice Quality testing
  • Remote access and scripting: Install the unit and walk away! Use remote or scripting software to control or monitor the unit from anywhere. Any remote software such as VNC or PC anywhere will work. Or, use our powerful scripting software to automate and remote all data acquisition and processing functions.
  • Call Recording, Generation, and Monitoring for hundreds to thousands of calls in one platform 
  • Capable of simulating as well as decoding and demodulating fax calls over T1/E1 lines using Fax Simulator and FaxScan™ 
  • Windows® and Linux Drivers for Open Source Applications 
  • Supports both 32-bit and 64-bit Windows® operating system.
  • It can perform analysis and emulation of various signal types including voice, digits, and tones; various protocols including HDLC, ISDN, SS7, CAS, Frame Relay, GSM, GPRS, CDMA, and UMTS.
  • It is capable of T1 or E1 PCM signal visualization, capture, storage, analysis, and emulation. 
  • Routing and Bridging emulation over Multi T1/E1 WAN interfaces using MLPPP (Multi Link PPP) and MFR (Multi Link Frame relay) protocols
  • Automate the IVR testing process - call establishment and traffic generation / detection process through scripts
  • Monitoring IVR System for voice and data quality 
  • HDL File Conversion Utility

    This application converts a file from Ethereal format files (.PCAP, .CAP, and .PCAPNG) to GL proprietary file format (.HDL) and vice-versa. The application can automatically detect the format of the source PCAP file whether it is captured on Linux or Windows® and converts accordingly to HDL file. By converting the file to *.HDL format, the users can use the converted *.HDL files in T1 E1, T3 E3, LightSpeed1000™, or PacketScan™ applications to decode and analyze.

GL's offers other popular forms of T1 E1 analysis hardware such as




Physical Interface
USB Connector USB TYPE B
External Power Connector Coaxial DC Power Jack (mates with 5.5mm x 2.1mm coaxial plug)
T1/E1 Connectors (2) RJ48c Connectors
Audio Input/Output Connectors (4) 3.5 mm Unbalanced (or Mono) Audio Jacks (TX & RX)
External clock Input/output Connectors (2) MCX Coaxial Jacks
Handset Connectors: 2 RJ-22
  USB Requirements
USB Interface USB 2.0 Compliant Interface
  External Power Requirements

Power Requirements

+5V @ 1A with power applied to the center ring

  T1/E1 Line Interface

Framing Formats

Unframed, D4(T1) , ESF(T1), CAS(E1), FAS(E1), CRC4, J1
Hardware Compliant: SLC96, T1ESF ZBTSI

Line Code format

AMI, B8ZS(T1) or HDB3(E1)

Bert Pattern Generation

Pseudorandom patterns: (63) 2^6-1, (511) 2^9-1,(2047) 2^11-1, (32767) 2^15-1, (1048575) 2^20-1, (8388607), 2^23-1, QRSS.

Hardware Compliant: T1 In-Band Loop Code Generation and Detection

Fixed patterns: All Ones, All Zeros, 1:1, 1:7, 3 in 24.
Hardware Compliant: User pattern of up to 32 bits in length

International, National & Extra Bits: User Defined (E1)

Display and Logging

Bit Errors, Bit Error Rate, Error Seconds, Error Free Seconds, %EFS, Severely Error Seconds, % SES, Degraded Minutes, %Dmin, Loss Pattern Sync Count, Loss of Sync Seconds, Available Seconds, %Available Seconds, Unavailable Seconds, Bipolar Violations, BPV Rate, BPV Seconds, BPV Free Seconds, Frame Errors, FE Rate, FE Seconds, FE Free Seconds, with Detailed logging into disk file.

Resync In Progress, Loss of Signal, Blue Alarm, Change of Frame Alignment, Bipolar Violation, Frame Error , Carrier Loss, Yellow Alarm, Out of Frame Events Counter, Errored Superframe Counter, Bipolar Violations, Remote Alarm, Distant Multiframe Alarm, Signaling All Ones, CAS Multiframe Error, CRC4 Error.

Drop and Insert

Any Contiguous set of digital timeslots and/or audio input

Hardware Compliant: Any Contiguous Channels

Facility Data Link

T1 ESF Mode: Transmit/Receive Messages, Bit-Oriented Messages, and files.


T1/E1 Interface

Hardware Compliant: 

   ANSI: T1.403.1995, T1.231-1993, T1.408 
   AT&T: TR54016, TR62411
   ITU: G.703, G.704, G.706, G.736, G.775, G.823, G.932,    I.431, O.151, Q.161
   ITU-T: Recommendation I.432-03/93 B-ISDN User-   Network Interface-Physical Layer Specification
   ETSI: ETS 300 011, ETS 300 166, ETS 300 233, CTR12,    CRT4 
   Japanese: JTG.703, JTI.431, JJ-20.11 (CMI Coding Only)

T1 Output Level

T1: 3.0V Base to Peak Selectable 0-655Ft Pulse Equalization Setting

E1 Output Level

E1: 3.0V ± 0.3V Base to Peak

Line Buildout Selections

0dB, -7.5dB, -15dB, -22.5dB

Alarm Insertion

Blue, Yellow, Remote, Distant Multiframe

Hardware Compliant: 
   Bit 7 Zero Suppression
   D4 Yellow: 1 in S bit of frame 12
   AIS-CI Code 
   ESF-RAI CI Code

Receive Carrier Loss: 0's for 2047 or 255 bits

Error Insertion

BPV, Bit Error, Frame Error, CRC Errors, Burst Frames, Fixed Error Rate, Random Error Rate, auto logic from 10-2 to 10-9 for selectable 56K or 64Kps channels.

Internal Clock Specification

Standard: ± 3ppm 
Optional: ± 1ppm

Output Clock Source

Internal, Recovered, External Clock


Input Impedance

100 ohms for Terminate and monitor (T1)
120 ohms for Terminate and monitor (E1) 
> 1K ohms for Bridge


Terminate, Monitor, Bridge

T1 Input Frequency

1.544MHz ± 20KHz

E1 Input Frequency

2.048Mhz ± 20KHz

Frequency Measurement

± 1ppm

Error Detection

Frame Error, CRC Error, BPV Error, Logic Error, Frame Alignment Error

Hardware Compliant: 
   10 or 24 bits for sync time
   2/4, 2/5, or 2/6 frame bit in error frame select 
   Frame error bit corruption for 1 or 3 frame bits
   E-Bit Error 
   Line Code Violation
   Path Code Violation

Alarm Detection

D4 Yellow Alarm, ESF Yellow Alarm

Hardware Compliant: J1 Yellow Alarm

Input Range

   0 to 36dB (Long haul) 

Hardware Compliant:
   0 to 15dB (Limited Long haul)
    20dB, 26dB

   0 to 43dB (Long haul)

Hardware Compliant:
   0 to 13dB (Short Haul)
   20dB, 26dB

Intrinsic Jitter

Meets Jitter Tolerance:
Meets AT&T TR 62411 (Dec. 90)
Meets ITU-T G.823

Jitter Transfer: 
Meets AT&T TR 62411 (Dec. 90)

Level Measurement:

  PCM Interface


Synthesized Tone: 15 Hz to 3975 Hz selectable in 1Hz steps, +3.0dBm to -40dBm in 0.1 steps selectable, Frequency sweep.

Dual Tone: Single or any combination of tones.

Supervision: User defined states of A, B, (C,D) bits.

Signaling: DTMF/MF Dialing Digits.

File Playback: User created or recorded file.

Special Codes: Milliwat Codes, CSU Loop Up/Down Codes.


Displays for All Channels: Signaling Bits, Power Level, Frequency, Data.

Graphical displays: Oscilloscope, Spectral, Spectrogram, Signal-to-Noise

Signaling: DTMF/MF Dialed Digit Detection and Analysis

Recorder: Record Full/Fractional T1/E1 Timeslots to hard disk file.

  VF Audio Interface


Level: 0.0dBm ± 0.1dBm

Range: -7.2dB to +18.2dB selectable gain in 0.1dB steps

Output Impedance: 600 Ohms nominal


Gain - Selectable steps in 0.1dB steps Range: -18.6dB to +6.7dB

Audio Monitoring: Built-in Speaker or external speaker attachment.

Audio Insertion: Selected DS0 replaced with inserted audio from VF Input with selected gain.

Range: -18.0 dB to +7.3 dB selectable gain in 0.1dB steps

Volume Control: User specified software controller

Input Impedance: 600 ohms nominal


(4) 3.5 mm Unbalanced (or Mono) Audio Jacks (TX & RX)

  External Clock Interface

Input/Output Level

TTL Level tolerant

Input/Output Impedance

50 Ohms nominal

  Handset Interface

Made for Use with Handset to the following specifications

Handset Current: >2mA
Ouput Level: -46 dbV
Output Impedance: 1000 Ohms
Input Impedance: 150 Ohms

  Propagation Delay


Up to 2 Seconds

  Precision Delay


Up to 8 Seconds

  Computer Requirement


Core i3 or higher Windows OS, USB 2.0 Compliant Interface

  Physical Dimensions


5" (L) x 4 1/8" (W) x 1 ½" (H)


2 lbs.

* Specifications subject to change without notice.

Basic Applications
Optional Applications


Please Note: The XX in the Item No. refers to the hardware platform, listed at the bottom of the Buyer's Guide, which the software will be running on. Therefore, XX can either be ETA or EEA (Octal/Quad Boards), PTA or PEA (tProbe Units), UTA or UEA (USB Units), HUT or HUE (Universal Cards), and HDT or HDE (HD cards) depending upon the hardware.