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Uplink Port Status
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PA-T3 Receptacles and Cables
The PA-T3 port adapter serial interface cable, which is a 75-ohm coaxial cable, connects your router
to a T3 serial network. Serial cables conform to EIA/TIA-612 and EIA/TIA-613 specifications. The
serial ports on the PA-T3 serial port adapter are considered to be data terminal equipment (DTE)
devices.
On a single PA-T3 serial port adapter, there are one or two T3 serial ports, each with two connectors
(receive and transmit), where you connect the Cisco 75-ohm coaxial cable. The 75-ohm coaxial
cable (Cisco part number CAB-ATM-DS3/E3) for the PA-T3 serial port adapter is available only
from Cisco Systems; it is not available from outside commercial cable vendors.
The Cisco PA-T3 75-ohm coaxial cable (see Figure 2-3) is available only in 10-foot (3.05-meter)
lengths. The typical maximum distance between stations for PA-T3 transmissions is
1300 feet (396 meters).
Figure 2-3
BNC plug
You can test the data terminal equipment-to-data circuit-terminating equipment (DTE-to-DCE)
cable connection by using the loopback dte command. See the "Using the loopback Command to
Verify the Physical Interface" section on page 8-24 for more information.
Interoperability Guidelines for PA-T3 Serial Port Adapter DSUs
The PA-T3 serial port adapter supports several types of integrated DSUs. Table 2-3 lists the feature
compatibilities of the PA-T3 serial port adapter DSUs.
Table 2-3
DSU
DL3100
Kentrox
Larscom
1 MDL=Maintenance Digital Link.
2 PA-T3 serial port adapters support either scrambling or Kentrox subrate, not both at the same time.
Color
State
Green
On
Yellow
On
PA-T3 Serial Port Adapter Cable
75-ohm coaxial cabling
BNC plug
Feature Compatibilities of PA-T3 Serial Port Adapter DSUs
Full Rate
Scrambling
Support
Support
Yes
Yes
Yes
Yes
Yes
Yes
Description
Indicates that port adapter is ready for operation.
Indicates that port is in local loopback mode.
Subrate
Support
Yes
2
2
Yes
Yes
PA-T3 Receptacles and Cables
1
MDL
Support
No
No
No
Preparing for Installation 2-5
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