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Chapter 1
Overview
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
Table 1-1
Parameter
Line rate
Line code
Impedance
Output Pulse shape
Input signal
Output signal
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).
feature compatibilities of PA-MC-2T3+ DSUs.
Table 1-2
Vendor
Digital Link
ADC Kentrox
Larscom
Adtran
Verilink
OL-3526-05
lists the specifications that the T3 front end is designed to meet.
Specifications for the T3 Front End
Specification
44.736 Mbps (±20 ppm)
B3ZS (bipolar with three-zero substitution)
75 ohms
ANSI T1.102, pulse amplitude is between 0.36 and 0.85 volts peak
0.035-1.1 volts peak
Able to drive 450 feet (135 meters) of 75-ohm coaxial cable (734A
or equivalent) and meet pulse shape template
Feature Compatibilities of PA-MC-2T3+ DSUs
Full Rate
DSU Model
Support
DL3100
Yes
T3/E3 IDSU
Yes
Access T45
Yes
T3SU 300
Yes
HDM2182
Yes
PA-MC-2T3+ Multi-Channel T3 Port Adapter Installation and Configuration
Scrambling
Subrate
Support
Support
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
T3 Specifications
Table 1-2
lists the
1-3
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