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Cables and Pinouts
Table 1-1 Standards for Transmission Speed Versus Distance
Balanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232. The
recommended distance limits forEIA/TIA-449 shown in Table 1-1 are also valid for V.35, X.21, and
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.
Cables 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+ Receptacles and Cables
The PA-4T+ and adapter cables allow a high density of interface ports, regardless of the size of the
connectors typicallyused witheach electrical interfacetype. All portsuse anidentical 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 cabledetermines the electrical interface typeand mode of theport (DTE or DCE)
to which it is connected.
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:
• EIA/TIA-232: DTE mode with a DB-25 plug (CAB-232MT=); DCE mode with a DB-25
receptacle (CAB-232FC=).
EIA/TIA-232
Distances
EIA/TIA-449, X.21, V.35, EIA-530
Distances
Rate (bps) Feet Meters Feet Meters
2400 200 60 4,100 1,250
4800 100 30 2,050 625
9600 50 15 1,025 312
19200 25 7.6 513 156
38400 12 3.7 256 78
56000 8.6 2.6 102 31
1544000 (T1) – – 50 15