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T3 E3 Analyzer

 USB T3/E3 Analyzer Software Ver 6.2.2 | Now Available


A T3 line is an ultra-high-speed signal capable of transmitting data at rates up to 44.736 Mbps. An E3 signal is situated at the third level within the Plesiochronous Digital Hierarchy (PDH) and has a bit rate of 34.368 Mbps.
T3 or E3 has two flavours channelized (structured) and  unchannelized (unstructured).

  • In Channelized (Structured), a T3 (DS3) consists of 7 T2s (DS2) and each T2 consists of 4 T1s (DS1), thus a total of 28 T1s, or 672 full duplex voice channels are provided. Similarly, an E3 consists of 4 E2s and each E2 consists of 4 E1s, thus a total of 16 E1s, or 480 full duplex voice channels are provided. Thus, a channelized T3 signal carries 28 T1 signals, each operating at a rate of 1.544 Mbps. A channelized E3 signal carries 16 E1 signals each operating at a rate of 2.048 Mbps.

  • In Unchannelized (Unstructured), T2s or T1s or E2s or E1s DO NOT exist within T3 or E3. Instead, most of the capacity within 44.736 Mbps for T3 and 34.368 Mbps for E3 is used for data, with a small amount for overhead. With the advent of the internet, T3 (DS3) and E3 can be used to transport not only data, but also packetized voice, and packetized video. Example protocols include Asynchronous Transfer Mode (ATM), PPP, HDLC, and Frame Relay.


GL’s USB based T3 E3 Analyzer is one of the smallest and lightest pods (weighing only 1.75 lbs) capable of processing signalling, voice, and data on T3 and E3 lines. The pod when connected to Notebook or Desktop PC is capable of capturing two full T3 (DS3) or E3 data streams, dropping and inserting T1 (DS1) or E1, and analysis of HDLC, ATM, Frame Relay, and PPP Protocols. It includes various signal testing capabilities for Unchannelized (Unstructured) and Channelized (Structured) T3 E3 Traffic, such as -

  • Analysis/Emulation of T3 (44.736 Mbps) and E3 (34.368 Mbps)
  • Analysis/Emulation of Unchannelized (Unstructured) T3 or E3 for ATM, PPP, HDLC, and Frame Relay
  • Record / Playback of entire T3 or E3
  • Monitoring & generating alarms, and error insertion
  • Analysis of all 56 T1s (1.544 Mbps each), or 32 E1s (2.048 Mbps each)
  • Analysis of Fractional T1s and E1s, N x T1s or N x E1s,
  • Analysis of any combination of DS0s (64 kbps each) within the T1s or E1s, 56 x 24 = 1,344 DS0s for T1 or 32 x 32 = 1024 DS0s

The channelized option in the T3 E3 Analyzer uses “software-only” approach to support direct access to all 2x28 T1s or 2x21 E1s or 2x16 E1s on a T3/E3 line per board for analysis and monitoring– all within a single PC, including differing T1/E1 framing formats, physical layer alarms, and payloads.

GL's T3 E3 Analyzer also includes scrambling and subrate features. Subrate allows fractional bandwidth, i.e. less than the full 44.736 Mbps. Scrambling improves synchronization performance by randomizing repetitive patterns and long strings of zeros.


  • One of the smallest and lightest T3 (DS3) /E3 analysis platforms with dual data stream capture capability.
  • Multiple interfaces for analysis (T3 (DS3) /E3, T1/E1 and Ethernet) and control (USB and Ethernet) to support a wide array of testing scenarios.
  • Plug and Play through USB 2.0 control interface
  • Software Selectable T3 (DS3) and E3 interface along with T1 and E1 Drop and Insert
  • Dual T3 (DS3) /E3 Receivers and Transmitters for non-intrusive and intrusive testing of both eastbound and westbound signals at the same time
  • Channelized (Structured) Testing

With Drop and Insert Functionality –

    • Uses the Dual T1 E1 ports on the hardware
    • Multiplex / De-multiplex T1 (DS1) /E1 signals (Drop and Insert).
    • Receivers for bidirectional monitoring with Dual T1 (DS1)/E1 drop
    • Transmit multiplexed externally inserted or internally generated T1/E1 streams into T3 (DS3)/E3
    • Stress test M13 (E13) multiplexers and 3/1 Digital cross connect systems.
    • Dual channel drop and insert of T1/E1 signals from any one of the T3 (DS3) /E3 signals
    • Broadcast or Loopback Individual T1s/E1s received from T3 (DS3) /E3

With T1 E1 Rx Server Software –

    • T3/E3 Data is received by the T1 E1 Receive Server, which demultiplexes the data to T1 or E1 Channels.
    • Receive 28 T1 Channels per port from T3 signal
    • Receive 21 E1 Channels per port (G.747 Mapping) per port from T3 signal
    • Receive 16 E1 Channels per port from E3 signal
    • Supports monitoring of framed and unframed T1/E1 (Rx Only)
    • Simultaneous analysis of all 56 T1s (1.544 Mbps each), or 32 E1s (2.048 Mbps each)
    • Analysis of Fractional T1s and E1s, N x T1s or N x E1s,
    • Analysis of any combination of DS0s (64 kbps each) within the T1s or E1s, 56 x 24 = 1,344 DS0s for T1 or 32 x 32 = 1024 DS0s
    • Supports Protocol Analysis of all structured protocols – HDLC, ISDN, CAS, and many more
    • Monitoring of T1 E1 Alarms, Payload, an d Framing structure
  • Unchannelized (Unstructured) Testing
  • Flexible clocking - internal, recovered (from T3/E3, T1 or E1) and external.
  • Scripting and Automation through GL’s well-known Windows Client Server (WCS) approach.
  • Includes HDL File Conversation utility to convert ethereal format file (*.PCAP, *.CAP, and *.PCAPNG) to GL’s file format (*.HDL) and vice-versa.
  • Monitor / Manage the Analyzer remotely via Ethernet port (future enhancement).


World’s smallest T3 (DS3) /E3 Analysis platform with dual data stream capture capability:

With the size of a small paperback book and weighing only 1.75 lbs, GL's newest T3 E3 Analyzer pod is one of the smallest and lightest analyzer units in the world. The small footprint makes it ideal for use in the lab as well as in the field. The unit's lightweight makes it easy to carry in the pouch of a Notebook PC making it perfect for air travel. Compatibility with any Desktop or Notebook PC allows the software to be installed on many PCs - just ship the unit to the intended location and use it on an available PC.

Portable USB T3 E3 Unit

Multiple interfaces for analysis (T3/E3) and control (USB, Ethernet) makes it ideal for a wide array of testing scenarios:

  • T3 (DS3) or E3 - BNC interface (2 Transmit and 2 Receive ports).
  • T1 or E1 - RJ-48c interface (2 Transmit/Receive Ports).
  • External Clock: MCX (2 Ports – one each for the two T3/E3 ports).
  • Ethernet Port – For wirespeed Ethernet analysis, remote monitoring, and management.
  • USB 2.0 - The USB interface is used to connect the analyzer unit to a Desktop or a Notebook PC for storage, display, and control.

Plug and play through the USB 2.0 control interface:
Its USB 2.0 control interface to PC enables plug and play capability. This will allow you to share the unit among multiple users since it can be moved from PC to PC. The unit is also highly portable due to the small size and light weight.

Comprehensive T3 E3 testing solution:
GL’s T3/E3 analyzer unit offers a complete solution for T3/E3 (44.736/34.368 Mbps) testing. It is fully compatible with GL’s other test systems. It can be used in conjunction with GL’s Laptop T1/E1 analyzer for individual T1, E1, DS0, and analog analysis.

Portable USB T3 E3 Front and Back Panel


T3 (DS3) / E3 2x DS3/E3 75Ω BNC (Tx, Rx) Ports
T1 (DS1) /E1 2x DS1/E1 RJ-48c (Tx, Rx) for Drop/Insert
External Clock 2x MCX External Clock Ports
PC Interface 1x USB 2.0 for PC Interface
External Power 9 V DC
Ethernet 1x 1000 Mbps Ethernet Port


T3 (DS3) / E3 Line Interface  
Output Amplitude 800mV ± 50mV
Input Impedance 75 Ohms unbalanced (BNC)
Line Code B3ZS (T3), HDB3 (E3)
Terminate Input Level 0.09Vp – 0.85Vp
Monitor Input Level 0.025Vp – 0.08Vp


Clock Source  
Internal ± 1 PPM @25C [± 4.5 ppm (includes ageing, stability)]
Recovered Clock recovered from receiver
External TTL Level signal

High Speed (T3 (DS3) / E3 Rate)

Low Speed (2KHz, 8KHz, 2MHz, 1.5MHz) Recovered from Inserted T1 or E1


T3 (DS3) / E3 Transmitter  
T3 (DS3) / E3 Payloads Framed T3 (DS3) / E3 Data, Unframed T3 (DS3) / E3, Idle, AIS
T3 Framing Modes 

Unframed M13 (ANSI T1-107 – 1995) Structured (Channelized), and Unstructured (Unchannelized) C-bit (ANSI T1-107 – 1990) - Structured (Channelized), and Unstructured (Unchannelized)

Unchannelized T3 supports subrate and scrambling formats for Digital Link, ADC/Kentrox, Larscom, Adtran, and Verilink data service units (DSUs)
E3 Framing Modes Unframed, E13 (for E3) - Structured (Channelized), and Unstructured (Unchannelized)
Framed T3 (DS3) / E3 Unstructured Payload Raw Data from File, ATM Cells (only for T3), HDLC Frames, BERT Patterns
Unframed E3 Payload Raw Data from File, BERT Patters
Channel Structure T1, E1 (DS1) (ITU-T G.747)
BERT Patterns QRSS, 2^6-1, 2^9-1, 2^11-1, 2^15-1, 2^20-1, 2^23-1, User Defined upto 32-bits, other static patterns
T1 (DS1) Payload Inserted T1, AIS, Loopback, BERT Patterns (future)
E1 Payload Inserted E1, AIS, Loopback, BERT Patterns (future)
Loopbacks Complete T3 (DS3) / E3 Signal, Selected T1s/E1s from incoming T3 (DS3) / E3


T3 (DS3) / E3 Receiver  
T3 (DS3) Framing Format M13 (ANSI T1-107 – 1995), C-bit (ANSI T1-107 – 1990), Unframed, Structured (Channelized), and Unstructured (Unchannelized)
E3 Framing Format E13, Unframed, Structured (Channelized), and Unstructured (Unchannelized)
Channel Structure T1 (DS1) /E1 (ITU-T G.747)
Framed T3 (DS3) / E3 Unstructured Payload Raw Data Captured to File, ATM Analysis (only for T3), HDLC Frames Analysis, BERT Patterns Measurement
Framed T3 (DS3) / E3 Structured Payload Raw Data Captured to File, BERT Patterns Measurement, Drop Selected T1(s) / E1(s)


T1 E1 Transmit / Receiver:  

Bit error rate testing (BERT) pattern generation and detection per channel


Transmit Tone, Transmit Gaussian Noise, Transmit Multiframe


Transmit Signalling Bits, and Rx-to-Tx loopback


G.703 Physical/Electrical Characteristics
GR-499-CORE Physical/Electrical Characteristics
G.821 Bert Analysis
G.742 Multiplexing
G.751 Multiplexing


Supported Protocols  

Channelized Protocols

High-Level Data Link Control (HDLC)
Point-to-Point Protocol (PPP), RFC 1662, Multilink PPP (MLPPP), RFC 1990
Frame Relay, RFC 1490
Multilink support over Frame Relay (FRF.12) and MLPPP
V5.x, DCME, FDL (T1 Interface only)

UnChannelized Protocols (Unstructured)

PPP, ATM, Frame Relay


T3 (DS3) / E3 Line Rate Offset ± 50 PPM in 1 ppm Steps
Level Measurement Supported
Frequency Measurement ± 1 PPM
T3 (DS3) Error Add Payload Bit, Frame Errors, P-bit, C-bit, EXZ (for T3);
E3 Error Add Frame Errors, Code Violation (CV) Error, EXZ, Payload Bit
T3 (DS3) Alarm Generation LOS, AIS, RAI (X-bit), Idle, FEAC Codes (Loopback and alarm/status codes)
T3 (DS3) Alarm Monitoring LOS, LOF, AIS, Idle, RAI (X-bit), EXZ
E3 Alarm Generation LOS, OOF, RAI (X-bit);
E3 Alarm Monitoring LOS, LOF, AIS, RAI (X-bit), EXZ
T3 (DS3) FEAC Codes Alarm status codes, loopback codes with channel indicator for T1
LED Indicators LOS, LOF, ERR, PGM
Operating temperature 0° C to 40 ° C
Storage temperature 10° C to 70 ° C
Relative humidity 10 % min, 90 % max, non-condensing


Dimensions 1.6" high, 9.25" deep, 5.5" wide
Weight 1.75 lbs
Power Supply Input 9 V DC at 1 A

* Specifications subject to change without notice.



Accompanying Basic & Optional Software

A list of all the basic applications and other optional applications (requiring additional licenses) are listed here.

Supported Protocol Standards for Unchannelized T3E3 Analyzer


  • Analyze HDLC frames over bidirectional T3/E3 with host of protocol analyzer features such as Real-time filter, Capture filter, Statistics, and so on.
  • Captured frames can later be used for traffic simulation using HDLC Transmit/Receive/Playback and Impairment applications

    For more information, please visit HDLC Protocol Analysis over T3 E3

Frame Relay

  • Analyze Frame Relay protocol over bidirectional T3/E3 with host of protocol analyzer features such as Real-time filter, Capture filter, Statistics, Call Trace, and so on.
  • Analyze Permanent Virtual Connection (PVC) and Switched Virtual Connection (SVC) frames
  • Call Trace view displays called/ calling number, released calls, call status, & more.

    For more information, please visit Frame Relay Protocol Analysis over T3 E3.


  • Support of various UNI Signaling Protocols i.e. UNI 4.0, UNI 3.1 and UNI Q-2931
  • Call trace capability based on UNI signaling parameters, VPI/VCI and others
  • CRC verification for AAL5 carrying packet data

    For more information, please visit ATM Protocol Analysis over T3 E3.


  • Supports a host of protocols PPP, IPCP, BCP, BPDU, PAP, CHAP, HTTP, SNMP, STUN, FTP, DNS, and DHCP
  • Ability to test and perform numerous measurements across WAN- LAN or LAN-LAN connection
  • Supports Packet Data Analysis module (requires additional license) to perform detail analysis of PPP packets over IP and segregates them into SIP / H323 / Megaco / MGCP / T.38 / IuCS / GSM A Fax calls.

    For more information, please visit PPP Protocol Analysis over T3 E3

DSU Subrate Configuration

Subrate allows DSU manufacturers to control bandwidth from service provider end and sell user specific bandwidth. USB T3 E3 Analyzer supports DSU DS3 Subrate configuration for Digital Link, Larscom, Verilink, and Adtran as shown in the figure.

For more details refer to



  • Provides support for channelized T3 E3 to T1 E1
  • Supports up to 56 T1s and 32 E1s channels per T3/E3 port
  • Analysis of all 56 T1s (1.544 Mbps each), or 32 E1s (2.048 Mbps each)
  • Analysis of Fractional T1s and E1s, N x T1s or N x E1s
  • Analysis of any combination of DS0s (64 kbps each) within the T1s or E1s,
    56 x 24 = 1,344 DS0s for T1 or 32 x 32 = 1024 DS0s
  • Supports structured and unstructured T1/E1 transmission and reception
  • Supports all of the monitoring applications under "basic applications" and "special applications" for T1 or E1 channels
  • Supports Protocol Analysis of all structured protocols – HDLC, ISDN, CAS, and more
  • Supports monitoring of T1/E1 alarms in channelized T3/E3 lines
  • Comprehensive analysis of voice, data, fax, protocol, analog, and digital signals, including echo and voice quality testing
  • Extracting T1s/E1s from multiple T3/E3 ports is supported.
  • User selectable T1 and E1 channels to multiplex. The channel numbering is same as in De-multiplexing
  • Unused channels will be treated as unequipped.
  • Broadcasts the selected T1/E1 channel data on all the 32 E1’s or 56 T1’s

Working Principle

The T3/E3 hardware platform with associated T1/E1 Receive Server and Channelized T3/E3 analyzer software can capture, record, and monitor multiple T1 or E1 channels over Channelized T3/E3 links. It can perform analysis of various signal types including voice, digits, tones, fax, modem, and raw data.

The Channelized T3 E3 to T1 E1 solution, comprises of two modules, namely, the High-Speed T3/E3, and Low-Speed T1/E1 modules. These two modules are actually two separate processes running on the same computer. The High-Speed T3/E3 process is called as T1/E1 Receive Server, as the name suggests it runs as a service and works with USB T3/E3 hardware. The Low-Speed T1/E1 module part is referred to as Channelized T3 E3 analyzer software.

The T1/E1 Receive Server application within USB T3/E3 analyzer acts as software based Multiplexer- Demultiplexer application capable of channelization of a T3 signal into 56 independent T1 channels and an E3 signal into 32 E1 channels. The channelized streams containing T1/E1 frames are forwarded to T3/E3 Channelized T1E1 analyzer software over UDP using GL Message Protocol for analysing frames per channel.

ISDN Analysis over T3E3 Signals (56 T1s)

Accompanying Basic Software / Features

Almost all the basic and optional monitoring applications supported by T1 E1 analyzers are also supported by Channelized T3 E3 T1E1 analyzer. For example, capturing an entire T1/E1 signal, or performing ISDN, or SS7 analysis, can be performed using the software accompanying the Channelized T3 E3 T1E1 analyzer.

  • A list of all the basic applications and other optional applications (requiring additional licenses) are listed here.

Buyer's Guide

Item No. Item Description


Portable (USB) Dual T3 E3 / T1 E1 Hardware Unit – requires TT3001 or EE3001

  UnChannelized T3 E3 Testing


E3 / E1 Analyzer Basic Software


T3 / T1 / E1 Analyzer Basic Software

TT3020/ EE3020

T3/ E3 Record Playback Software (GUI)
File Record Send over T3/E3

TT3090 / EE3090

T3 / E3 HDLC Tx/Rx Test + Analyzer (GUI)
Send Receive Analyze HDLC over T3/E3

TT3135 / EE3135

T3 / E3 PPP Analyzer (GUI)
Analysis and decode of PPP over T3/E3

TT3136 / EE3136

PDA for PPP Analyzer

TT3130 / EE3130

T3 / E3 Frame Relay Analyzer (GUI)
Analysis and decode of Frame Relay over T3/E3


T3 ATM Analyzer (GUI)
Analysis and decode of ATM cells over T3

TT3600 / EE3600

T3 / E3 Basic Client Server Scripted Control Software
Precise & Sequential Control of T3/E3 Analyzer via Client Server – Uses TCP/IP

TT3610 / EE3610

T3 / E3 Client Server Tx/Rx File
Tx / Rx Files on Unframed Unchannelized T3/E3

TT3634 / EE3634

T3 / E3 Client Server High Throughput HDLC Tx/Rx Test
HDLC Simulation with Impairments

  Channelized T3 E3 T1 E1 Testing


E3 / E1 Analyzer Basic Software


T3 / T1 / E1 Analyzer Basic Software


Optional Channelized T3 license for T1


Optional Channelized T3 License for E1


Optional Channelized E3 license for E1


Channelized Options for T1

  Related Hardware


T3 E3 Accessory Kit
(Four SA007o BNC-to-BNC Cables (75 Ohm), Two SA017B RJ48C to RJ48C Crossover Cables, and Two T-taps with Attenuator )

UT301 / UT302

T3 Analysis PCI Card w/ Basic Software and Client / Server and Command Line Utility


High Stability Internal Clock Option
± 1 ppm Internal Clock


Universal T1 or E1 card


Portable USB based Dual T1 or E1 Laptop Analyzer


tProbe™ T1 E1 Base Unit


QuadXpress T1E1 Main Board (Quad Port– requires additional licenses)
OctalXpress T1E1 Main Board plus Daughter Board (Octal Port– requires additional licenses)


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