| | | | PA-T3 Receptacles and Cables |
| | | | | |
| LED | Color | State | Description |
| | | | | |
| ENABLED | Green | On | Indicates that port adapter is ready for operation. |
| | | | | |
| Uplink Port Status | | | | |
| | | | | |
| LL | Yellow | On | Indicates that port is in local loopback mode. |
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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 PA-T3 Serial Port Adapter Cable
75-ohm coaxial cabling
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 |
| | | | |
| Full Rate | Scrambling | Subrate | MDL1 Support |
DSU | Support | Support | Support |
DL3100 | Yes | Yes | Yes | No |
| | | | |
Kentrox | Yes | Yes2 | Yes2 | No |
Larscom | Yes | Yes | Yes | No |
| | | | |
1MDL=Maintenance Digital Link.
2PA-T3 serial port adapters support either scrambling or Kentrox subrate, not both at the same time.
Preparing for Installation 2-5