Cisco Systems manual PA-T3 Receptacles and Cables

			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.

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

BNC plug

BNC plug

H3399

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