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Patton Electronics 2711
T1 / FT1 to V.35 Interface Converter/CSU/DSU
Black Box MT120A-R2

Patton Model 2711
T1 / FT1 to V.35 Interface Converter/CSU/DSU
This Pocket-Sized Converter-CSU/DSU Makes it Simple and Affordable to Connect V.35 to T1 or Fractional T1 (Nx64)
Model 2711
Model 271/CM/UI = Black Box MT120A-R2
  Features & Benefits
  • Plugs directly into V.35 interface of router, switch or multiplexer
  • Connects to an unstructured 4-wire T1 circuit at 1.544 Mbps
  • Supports n x 56/64 framed T1 connections from 64 kbps to 1.536 Mbps
  • Data rates, clocking and LBO levels selected by internal DIP switches
  • Facilitates point-to-point campus communication up to 6,000 ft (1.14 miles/1.82 km)when used in pairs
  • Supports D4/AMI or B8ZS/ESF line coding, loopback diagnostics
  • Seven easy-to-read diagnostic LEDs

The Patton Model 2711 T1-to-V.35 interface converter-CSU/DSU connects to a 4-wire T1 circuit and plugs directly into the V.35 interface of a router, switch or multiplexer. Connecting to an unstructured T1 circuit at 1.544 Mbps, the Patton 2711 also supports n x 56/64 framed connections at data rates from 128 kbps to 1.536 Mbps. In addition, the Patton 2711 may be used in pairs in point-to-point applications, where it is able to connect two V.35 devices at data rates to 1.544 Mbps over distances to 6,000 ft (1.14 miles/1.82 km). Adapter cables are available to connect the Patton 2711 to WAN equipment that does not use a standard V.35 interface (such as the Cisco 2501 router, which uses a high-density 60 pin connector).

The Patton 2711 supports D4/AMI or B8ZS/ESF line coding and framing, internal or network clocking, and selectable 0, 7.5 or 22.5 db line build out (LBO) levels. These parameters are user configurable via internal DIP switch settings. The Patton 2711 is also switch-configurable for clear channel (1.544 Mbps) or fractional (nx 56/64 kbps) operation. Fractional settings include 2, 4, 6, 8, 12, 16 and 24 channels (for example, setting the Patton 2711 at “224/256 kbps” would activate four 56/64 kbps channels).

Measuring only 4.6” long, 2.1” wide and 0.81” high (11.6 x 5.3 x 2.1 cm), the Patton 2711 has seven diagnostic LEDs. Diagnostics include response to Central Office initiated D4 loopup and loopdown codes, ESF line loop and payload loop FDL messages, and universal loopback de-activate message. Power is supplied to the Patton 2711 by an external AC transformer.


Transmission Format: Synchronous, 4-wire
Network Connecton: RJ-48C
Nominal Impedance: 100 Ohms
Network Line Speed: 1.544 Mbps
Distance: up to 6,000 feet, point-to-point (when used in pairs)
DTE Data Rates: Switch selectable n x 56/64 from 128 kbps to 1.536 Mbps
DTE Interface: Integral V.35 (M/34 male) connector
Line Coding/Framing: AMI/B8ZS or D4/ESF
Trasnmit LBO: Selectable - 0, 7.5 or 22.5 db
Receive LBO: Automatic
Clocking: Internal or Network
LED Status Indicators: TXD, RXD, LOS (loss of signal), ALM (alarm), ERR (error), TST (test), PWR
Diagnostics: Responds to CO initiated D4 loopup and loopdown codes, ESF line loop and plyload loop FDL messages, universal loopback de-activate message
Power: External AC power supply
Compliance: CE Marked per EMC Directive 89/336/EEC and Low Voltage Directive 73/23/EEC; FCC Part 15, Class A; Canadian DOC CS 03
Standards: AT&T TR62411, ANSI T1.403, TR54016
Dimensions: 5.0” long, 2.1” wide and 0.81” high (12.7 x 5.3 x 2.1 cm)
Weight: 2.02 lbs

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