C H A P T E R
1
Overview
This chapter describes the PA-4T port adapter and contains the following sections:
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•
•
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Port Adapter Overview
support full-duplex operation at T1 (1.544 Mbps) and E1 (2.048 Mbps) speeds. Each port supports any
of the available interface types: Electronics Industries Association/Telecommunications Industries
Association (EIA/TIA)-232, EIA/TIA-449, V.35, X.21, and EIA-530. The cable attached to each PA-4T
interface port determines its type (EIA/TIA-232, and so forth) and its mode (DCE or DTE).
Note
Although the VIP supports online insertion and removal (OIR), individual port adapters do not. To
replace port adapters, you must first remove the VIP from the chassis, and then replace port adapters as
required.
Cisco 7200 series routers support OIR of all port adapter types.
Figure 1-1
PA-4T—Faceplate View
FAST SERIAL
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Chapter 1 Overview
Synchronous Serial Specifications
Synchronous Serial Specifications
The PA-4T provides up to four synchronous serial interfaces. Each interface allows a maximum
bandwidth of 2.048 Mbps; the speed depends on the type of electrical interface used. Use EIA/TIA-232
for speeds of 64 kilobits per second (kbps) and below, and use X.21, EIA/TIA-449, V.35, or EIA-530 for
higher speeds.
Serial signals can travel a limited distance at any given bit rate; generally, the slower the baud rate, the
greater the distance. All serial signals are subject to distance limits beyond which a signal degrades
significantly or is completely lost.
interface type. The recommended maximum rate for V.35 is 2,048 Mbps.
Table 1-1
Standards for Transm ission Speed Versus Distance
EIA/TIA-232
Distances
EIA/TIA-449, X.21, V.35, EIA-530
Distances
Rate (bps)
2400
Feet
200
100
50
Meters
Feet
Meters
1,250
625
312
156
78
60
30
15
7.6
3.7
2.6
–
4,100
2,050
1,025
513
4800
9600
19200
25
38400
12
256
56000
8.6
–
102
31
1544000 (T1)
50
15
Balanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232. The
EIA-530. EIA/TIA-449 and EIA-530 support 2.048-Mbps rates, and V.35 supports 2.048-Mbps rates
without any problems; we do not recommend exceeding published specifications for transmission speed
versus distance. Do so at your own risk.
LEDs
The PA-4T contains the enabled LED, standard on all port adapters, and a one status LED for each port.
After system initialization, the enabled LED goes on to indicate that the PA-4T has been enabled for
Figure 1-2
LEDs on the PA-4T—Horizontal Orientation Show n
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Chapter 1 Overview
Cables, Connectors, and Pinouts
The green enabled LED on the port adapter indicates that the motherboard is enabled and receiving
power, and that the port adapter is ready for operation.
The following conditions must be met before the enabled LED goes on:
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•
The PA-4T interface is correctly connected and receiving power
The PA-4T-equipped card or router contains a valid microcode version that has been downloaded
successfully
•
The bus recognizes the PA-4T or PA-4T-equipped VIP
If any of these conditions is not met, or if the initialization fails for other reasons, the enabled LED does
not go on.
Table 1-2 lists LED colors and indications.
Table 1-2
PA-4T LEDs
DTE
DCE
LED Label
Function Function Color and Function
TD
Transmit Transmit Green
data out
data in
TC
Transmit Transmit Green
clock in
clock in
(TXCE)
RD
RC
Receive
data in
Receive Green
data out
Receive
clock in
Receive Green
clock
out
LB/CD
–
–
–
Green: DTR, DSR, RTS, CTS, or DCD active
Yellow: local loop or internal loop active
EN (enable)
–
Green: port adapter enabled
Cables, Connectors, and Pinouts
The following sections describe the serial receptacles on the PA-4T, and the cables and pinouts for the
various serial interface cables.
PA-4T Port Adapter Receptacles and Cables
The PA-4T and adapter cables allow a high density of interface ports, regardless of the size of the
connectors typically used with each electrical interface type. All ports use an identical 60-pin, D-shell
receptacle that supports all interface types: EIA/TIA-232, V.35, EIA/TIA-449, X.21, and EIA-530. Each
port requires a serial adapter cable, which provides the interface between the high-density serial port and
the standard connectors that are commonly used for each electrical interface type.
Note
The adapter cable determines the electrical interface type and mode of the port (DTE or DCE) to which
it is connected.
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Cables, Connectors, and Pinouts
The network end of the cable is an industry-standard connector for the type of electrical interface that
the cable supports. For most interface types, the adapter cable for DTE mode uses a plug at the network
end, and the cable for DCE mode uses a receptacle at the network end. Exceptions are V.35 adapter
cables, which are available with either a V.35 plug or a receptacle for either mode, and the EIA-530
adapter cable, which is available only in DTE mode with a DB-25 plug at the network end. The mode is
labeled on the molded plastic connector shell at the ends of all cables except V.35 (which uses the
standard Winchester block-type connector instead of a molded plastic D-shell).
Following are the available interface cable options (and product numbers) for the mode and network-end
connectors for each cable:
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•
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EIA/TIA-232: DTE mode with a DB-25 plug (CAB-232MT=); DCE mode with a DB-25 receptacle
(CAB-232FC=)
EIA/TIA-449: DTE mode with a 37-pin D-shell plug (CAB-449MT=); DCE mode with a 37-pin
D-shell receptacle (CAB-449C=)
V.35: DTE mode or DCE mode with a 34-pin Winchester-type V.35 plug (CAB-V35MT= or
CAB-V35MC=); DTE mode or DCE mode with a 34-pin Winchester-type V.35 receptacle
(CAB-V35FT= or CAB-V35FC=). Also available is a cable with a male DB-60 plug on the router
end and a male DB-34 shielded plug on the network end (CAB-V35MTS=).
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•
X.21: DTE mode with a DB-15 plug (CAB-X21MT=); DCE mode with a DB-25 receptacle
(CAB-X21FC=)
EIA-530: DTE mode with a DB-25 plug (CAB-530MT=)
Note
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Chapter 1 Overview
Cables, Connectors, and Pinouts
Figure 1-3
Serial Port Adapter Cables
(PA-4T port adapter)
Router connections
EIA/TIA-232
EIA/TIA-449
V.35
X.21
EIA-530
Network connections at the modem or CSU/DSU
Metric (M3) thumbscrews are included with each port adapter cable to allow connections to devices that
use metric hardware. Because the 4T port adapter uses a special, high-density port that requires special
adapter cables for each electrical interface type, we recommend that you obtain serial interface cables
from the factory.
EIA/TIA-232 Connections
The router (VIP) end of all EIA/TIA-232 adapter cables is a high-density 60-pin plug. The opposite
(network) end of the adapter cable is a standard 25-pin D-shell connector (known as a DB-25) that is
the adapter cable. The system console and auxiliary ports on the Route Switch Processor (RSP) in the
Cisco 7500 series also use EIA/TIA-232 connections; however, the 4T port adapter interfaces support
synchronous serial connections, and the console and auxiliary ports only support asynchronous
connections. Use caution when connecting EIA/TIA-232 cables to the 4T receptacles.
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Cables, Connectors, and Pinouts
Figure 1-4
EIA/ TIA-232 Adapter Cable Connectors
DTE
DCE
EIA/TIA-449 Connections
The router (VIP) end of all EIA/TIA-449 adapter cables is a high-density 60-pin plug. The opposite
(network) end of the adapter cable provides a standard 37-pin D-shell connector, which is commonly
cable. EIA/TIA-449 cables are available as either DTE (DB-37 plug) or DCE (DB-37 receptacle).
Figure 1-5
EIA/ TIA-449 Adapter Cable Connectors
DTE
DCE
V.35 Connections
The router (VIP) end of all V.35 adapter cables is a high-density 60-pin plug. The opposite (network)
end of the adapter cable provides a standard 34-pin Winchester-type connector commonly used for V.35
connections. Figure 1-6 shows the connectors at the network end of the V.35 adapter cable. V.35 cables
are available with a standard V.35 plug for DTE mode (CAB-V35MT=) or a V.35 receptacle for DCE
mode (CAB-V35FC=).
Figure 1-6
V.35 Adapter Cable Connectors
DTE
DCE
Note
Also available, but not shown in Figure 1-6, are CAB-V35MC=, a V.35 cable with a plug on the network
end for DCE mode, and CAB-V35FT=, a V.35 cable with a receptacle on the network end for DTE mode.
These cables are used for connecting V.35-equipped systems back to back.
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