
Preparing for Installation 2-5
PA-T3 Receptacles and Cables
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 PA-T3 Serial Port Adapter Cable
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 Feature Compatibilities of PA-T3 Serial Port Adapter DSUs
LL Yellow On Indicates that port is in local loopback mode.
DSU
Full Rate
Support
Scrambling
Support
Subrate
Support MDL
1
Support
1 MDL=Maintenance Digital Link.
DL3100 Yes Yes Yes No
Kentrox Yes Yes
2
2 PA-T3 serial port adapters support either scrambling or Kentrox subrate, not both at the same time.
Yes
2
No
Larscom Yes Yes Yes No
LED Color State Description
ENABLED Green On Indicates that port adapter is ready for operation.
Uplink Port Status
75-ohm coaxial cabling
BNC plugBNC plug
H3399
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