T1 Line Monitor-0

T1 Line Monitor


2400 in stock

SKU: SKU - 2094 Category:



The DCB T-Monitor uses 4-wire repeater technology to provide a monitor point for T1 or E1 lines. The T-Monitor is based on the field proven DCB T-Extender. The T-Monitor uses repeater circuits on all data paths. This active repeater function is superior to simple passive monitor devices. For some T1 and E1 circuits, the double termination of passive monitor devices will attenuate the signal enough to generate data errors. The T-Monitor units are the solution to this attenuation problem. The Monitor units provide both electrical isolation and actively repeat the signal.

The circuitry is rated to -36 dB dynamic range at the T-1 rate of 1.544 Mbps. Solid copper 22 AWG, two twisted pair is the preferred cable for connection between the units, and all T1 equipment (We do not recommend CAT5 cable). Connection to the Monitor is made through RJ48(RJ-45) modular connectors or 4-wire screw down barrier strips. Each Monitor comes standard with three screw down barrier strips and two RJ48 connectors. If only RJ48 connections are desired extra RJ48 adapters (part number 9502122 to connect to telco, 9502172 to connect to customer equipment) may be ordered.

The DCB T-Monitors are normally powered by a small wall-mount transformer. Power supply options include 120/240 VAC, 12, 24, 48 or 125 VDC. Rack mount options include a 1U 3-unit shelf and a 20 slot rack.

The T-Monitors are transparent to the type of data sent over the T-1 link. The data can be D-4 format,AMI, ESF, PRI, etc.


T-1 Monitor
Actively repeats T1 bi-polar signals
DSX-1 interface

Recommended Cable

Two twisted pair solid copper 22 or 24 AWG; standard telco T1 cable if UTP category rated cable is used, CAT 3 is recommended.
We do NOT recommend CAT 5 cable. Although it often works well, CAT 5 cable has been shown to cause problems with many T1 installations.


Front panel power LED

  • T1 In and Out Connectors
    RJ48 modular # 9502122 # 9502172
    Pin 1 In – Receive Out Transmit
    Pin 2 In – Receive OutTransmit
    Pin 4 Out – Transmit In Receive
    Pin 5 Out – Transmit In Receive
    R4-Wire barrier strip # 5003011
    Pin 1 In – Receive
    Pin 2 In – Receive
    Pin 3 Out -Transmit
    Pin 4 Out -Transmit
  • T1 Monitor Connector
    RJ48 modular # 9502122 # 9502172
    Pin 1 Out – Transmit Left Port Out – Transmit Right Port
    Pin 2 Out – Transmit Left Port Out – Transmit Right Port
    Pin 4 Out – Transmit Right Port Out – Transmit Left Port
    Pin 5 Out – Transmit Right Port Out – Transmit Left Port
    R4-Wire barrier strip # 5003011
    Pin 1 Out -Transmit Left Port
    Pin 2 Out -Transmit Left Port
    Pin 3 Out -Transmit Right Port
    Pin 4 Out -Transmit Right Pair
  • The “main” T1 is passed through the unit with active repeaters. The transmit pair and receive pair from that main T1 are repeated to the monitor port as T1 two transmit pairs.
  • Pairs are not polarity sensitive
  • Units supplied with 3 screw downs and 2 RJ48 connectors (9502122 and 9502172)
  • RJ45 wiring adapter p/n 9502122 to connect to Telco (demarc) using straight through cables.
  • RJ45 wiring adapter p/n 9502172 to connect to customer equipment (CPE) using straight through cables.
  • Customer to demarc RJ45 cable p/n 9500095
  • Rack shelf, 1 U for 1 to 3 T1 Monitors
  • 20 slot, 4U high 19″ rack mount chassis
  • Din clip mount, spring mount, P.N 6013006

    5.5″ x 7.5″ x 1.5″ 100 ohm T1 DSX-1 interface 2 lbs including wall transformer 120 VAC external wall transformer supplied Optional 240 VAC, 12, 24, 48, 125 VDC options available 30 ma -40 to +70 C operating temperature Operating Humidity: < 95% non-condensing

    Installation Accessory Kit

    Many technicians installing T-Monitors for the first time don’t have all the cables required to cable up a unit and show that the T-1 line and other equipment operates properly on a work bench, or in the telephone closet. This kit includes all the parts needed to install the T-Monitor and the CPE within reach of the telephone company demarc and run short cables to the monitor device, as well as a physical loopback RJ-45 plug to use diagnosing any problems that occur. Parts included are three T-1 straight-through cables, two RJ adapter boards (one CPE and one Demarc), and one T-1 RJ loopback plug.

    Application Note

    T-1 Cables and Cross-Talk We receive many questions about what kind of cable works best for T-1 installations. Many people mistakenly believe Cat-5e or Cat-6 LAN cable works well. Here’s the scoop… a technical discussion about why you should use real T-1 cable for every T-1 installation, and some manufacturer’s part numbers. T-1 Cables and Cross Talk


Item Number Description
T-Monitor T-1 Line monitor w/ 120VAC power input
T-Monitor/12VDC T-1 Line monitor w/ 9-18 VDC power input
T-Monitor/24VDC T-1 Line monitor w/ 19-36 VDC power input
T-Monitor/48VDC T-1 Line monitor w/ 36-72 VDC power input
9501030 External 125 VDC power supply for standard T-Monitor
9500095 T-1 RJ45 straight through cable
9500099 T-1 RJ45 crossover cable
9502122 Additional RJ adapter
9502172 Additional RJ adapter
5003011 Additional screw terminal adapter
TMON-KIT T-Monitor installation accessory kit
9500106 T-1 loopback plug, RJ-45/48C
9902095 19″ rack shelf for 1 to 3 T-Monitors
L-1 20 slot 19″ rack chasis

Additional information

Weight 2 lbs
Dimensions 5 × 5 × 5 in