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Serial Interface Specifications
PA-4T+ Synchronous Serial Port Adapter Installation and Configuration1-4
EIA/TIA-449. Like EIA/TIA-449, EIA-530 refers to the electrical specifications of EIA/TIA-422
and EIA/TIA-423. The specification recommends a maximum speed of 2 Mbps. EIA-530 is used
primarily in the United States.
The V.35 interface is most commonly used in the United States and throughout Europe, and is
recommended for speeds up to 48 kbps. The X.21 interface uses a 15-pin connection for balanced
circuits and is commonly used in the United Kingdom to connect public data networks. X.21
relocates some of the logic functions to the data terminal equipment (DTE) and data
communications equipment (DCE) interfaces and, as a result, requires fewer circuits and a smaller
connector than EIA/TIA-232.
All interface types except EIA-530 can be individually configured for operation with either external
(DTE mode) or internal (DCE mode) timing signals; EIA-530 operates with external timing only.In
addition, all VIP2 serial interface types support nonreturn to zero (NRZ) and nonreturn to zero
inverted (NRZI) format, and both 16-bit and 32-bit cyclic redundancy checks (CRCs). The default
configuration is for NRZ format and 16-bit CRC. You can change the default settings with software
commands. (For more information, see the Chapter 8, “Configuring the PA-4T+ Interfaces.”)
There is no default mode or clock rate set on the VIP2 serial ports, although an internal clock signal
is present on all ports for DCEsupport. The internal clock also allows you to perform local loopback
tests without having to terminate the port or connect a cable. (All interface types except X.21 DTE
support loopback.) To use the portas a DCEinterface, you mustset the clockrate and connect aDCE
adapter cable. To use the port as a DTE interface, you need only connect a DTE adapter cable to the
port. Because the serial adapter cables determine the mode and interface type, the PA-4T+ interface
becomes a DTE when a DTE cable is connected to it.
If a DTE cable is connected to a port with a clock rate set, the DTE ignores the clock rate and uses
the external clock signal that is sent from the remote DCE. For a brief description of the clockrate
command, seeChapter 8, “Configuringthe PA-4T+ Interfaces.”Forcomplete commanddescriptions
and instructions, see the publications listed in the section “Related Documentation” section on
page vi.
Serial Interface 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.
Table 1-1 lists the recommended (standard) maximum speeds and distances for each PA-4T+ serial
interface type. The recommended maximum rate for V.35 is 2.048 Mbps.