Specifications

1-3
PA-MC-2T3+ Multi-Channel T3 Port Adapter Installation and Configuration
OL-3526-05
Chapter 1 Overview
T3 Specifications
In unchannelized T3 mode, the T3 section supports the maintenance data link (MDL) channel when
using c-bit parity framing as well as local and network loopbacks. Bit error rate testing (BERT) is
supported on the T3 link. The PA-MC-2T3+ supports Cisco High-Level Data Link Control (HDLC),
Frame Relay, PPP, and Switched Multimegabit Data Service (SMDS) Data Exchange Interface (DXI)
encapsulations over the serial interface.
T3 Specifications
The PA-MC-2T3+ T3 port is designed to receive and transmit at the DSX-3 level while driving and
receiving from 75-ohm coaxial cables (ATT 734A or equivalent quality coax). The T3 port connects
directly to any equipment with DSX-3 level BNC connectors.
Table 1-1 lists the specifications that the T3 front end is designed to meet.
Note The coax shield side of the T3 BNC connectors is connected to the router chassis ground.
Unchannelized Interoperability Guidelines for DSUs
The PA-MC-2T3+ supports several types of integrated data service units (DSUs). Table 1-2 lists the
feature compatibilities of PA-MC-2T3+ DSUs.
Table 1-1 Specifications for the T3 Front End
Parameter Specification
Line rate 44.736 Mbps (±20 ppm)
Line code B3ZS (bipolar with three-zero substitution)
Impedance 75 ohms
Output Pulse shape ANSI T1.102, pulse amplitude is between 0.36 and 0.85 volts peak
Input signal 0.035-1.1 volts peak
Output signal Able to drive 450 feet (135 meters) of 75-ohm coaxial cable (734A
or equivalent) and meet pulse shape template
Table 1-2 Feature Compatibilities of PA-MC-2T3+ DSUs
Vendor DSU Model
Full Rate
Support
Scrambling
Support
Subrate
Support
Digital Link DL3100 Yes Yes Yes
ADC Kentrox T3/E3 IDSU Yes Yes Yes
Larscom Access T45 Yes Yes Yes
Adtr an T3 SU 30 0 Yes Yes Yes
Verilink HDM2182 Yes Yes Yes