|
|
This chapter describes the PA-8B-ST and contains the following sections:
The PA-8B-ST shown in Figure 1-1, provides up to eight S/T-type BRI interfaces for connecting Cisco 7200 series routers to an ISDN WAN through an external network terminator (NT1) device. Each PA-8B-ST interface consists of two bearer (B) channels that can transmit and receive data at the rate of 64 kilobits per second (kbps), or 56 kbps in full-duplex mode, and one data (D) channel that can transmit and receive data at the rate of 16 kbps, full-duplex. The B channels are used for transmitting user data. The D channel is used for call setup control and network connection teardown, and provides the communication from the router to the ISDN switch. The PA-8B-ST supports dial-on-demand routing (DDR).
Each PA-8B-ST interface is an RJ-45 receptacle. A standard straight-through twisted-pair cable is available from Cisco Systems and other vendors for use with the PA-8B-ST.
 |
Note Cisco 7200 and Cisco 7100 series routers support the online insertion and removal (OIR) of all port adapter types. |
The PA-8B-ST can be installed in any of the available port adapter slots in Cisco 7200 series routers, in port adapter slot 3 in Cisco 7120 series, and port adapter slot 4 in Cisco 7140 series routers.
The PA-8B-ST has an enabled LED, standard on all port adapters, and two status LEDs for each port. (See Figure 1-2.)
After system initialization, the enabled LED goes on to indicate that the port adapter has been enabled for operation.
The following conditions must be met before the PA-8B-ST is enabled:
If any of the above conditions are not met, or if the initialization fails for other reasons, the enabled LED does not go on.
Table 1-1 lists LED colors and indications.
The eight S/T-type BRI interfaces on the PA-8B-ST support a standard, straight-through twisted-pair cable with an RJ-45 connector at the router (Cisco 7200 series or Cisco 7100 series) end and at the network end. Cisco Systems does not provide the cable; it is widely available from other vendors. Figure 1-3 shows the PA-8B-ST interface cable.
Table 1-2 lists the pinouts for PA-8B-ST interface ports.
| 8-Pin Interface Port1 | TE2 | NT3 | Polarity |
|---|---|---|---|
3 | Transmit | Receive | + |
4 | Receive | Transmit | + |
5 | Receive | Transmit | - |
6 | Transmit | Receive | - |
This section discusses port adapter slot locations on the supported platforms. The illustrations that follow summarize slot location conventions on each platform.
The PA-8B-ST can be installed in port adapter slot 3 in Cisco 7120 series routers, and in port adapter slot 4 in Cisco 7140 series routers. Figure 1-4 shows a Cisco 7120 with a port adapter installed in slot 3. Figure 1-5 shows a Cisco 7140 with a port adapter installed in slot 4.
Figure 1-6 shows a Cisco 7206 with port adapters installed. In the Cisco 7206, port adapter slot 1 is in the lower left position, and port adapter slot 6 is in the upper right position. (The Cisco 7202 and Cisco 7204 are not shown; however, the PA-8B-ST can be installed in any available port adapter slot.)
This section describes how to identify interface addresses for the PA-8B-ST in supported platforms. Interface addresses specify the actual physical location of each interface on a router or switch.
Interfaces on the PA-8B-ST installed in a router maintain the same address regardless of whether other port adapters are installed or removed. However, when you move a port adapter to a different slot, the first number in the interface address changes to reflect the new port adapter slot number.
Table 1-3 explains how to identify interface addresses.
| Platform | Interface Address Format | Numbers | Syntax |
|---|---|---|---|
Cisco 7120 series routers | Port-adapter-slot-number/interface-port-number | Port adapter slot—always 3 Interface port—0 through 7 | 3/1 |
Cisco 7140 series routers | Port-adapter-slot-number/interface-port-number | Port adapter slot—always 4 Interface port—0 through 7 | 4/0 |
Cisco 7200 series routers | Port-adapter-slot-number/interface-port-number | Port adapter slot—0 through 6 (depends on the number of slots in the router)1 Interface port—0 through 7 | 1/0 |
| 1Port adapter slot 0 is reserved for the Fast Ethernet port on the I/O controller (if present). |
This section describes how to identify the interface addresses used for the PA-8B-ST in Cisco 7100 series routers. The interface address is composed of a two-part number in the format port-adapter-slot-number/interface-port-number. See Table 1-3 for the interface address format.
This section describes how to identify the interface addresses used for the PA-8B-ST in Cisco 7200 series routers. The interface address is composed of a two-part number in the format port-adapter-slot-number/interface-port-number. See Table 1-3 for the interface address format.
In Cisco 7200 series routers, port adapter slots are numbered from the lower left to the upper right, beginning with port adapter slot 1 and continuing through port adapter slot 2 for the Cisco 7202, slot 4 for the Cisco 7204 and Cisco 7204VXR, and slot 6 for the Cisco 7206 and Cisco 7206VXR. (Port adapter slot 0 is reserved for the optional Fast Ethernet port on the I/O controller—if present.)
The interface addresses of the interfaces on the PA-8B-ST in port adapter slot 1 are
1/0 through 1/7 (port adapter slot 1 and interfaces 0 through 7). If the PA-8B-ST was in port adapter slot 4, these same interfaces would be numbered 4/0 through 4/7 (port adapter slot 4 and interfaces
0 through 7).
Posted: Fri Aug 25 10:57:21 PDT 2000
Copyright 1989-2000©Cisco Systems Inc.
