4 SERIAL I/O CARDS
3021M100-002
4-7
Cable
The V.35EU Serial I/O Card connects to external devices through a separately-
ordered three-meter (10 ft.) straight through, shielded twisted pair cable (part no.
CBLA0015-010) with a male M-34 block connector (ISO 2593) at each end. The
V.35EU I/O port can drive up to a maximum of 2150 pF cable capacitance while
remaining compliant with applicable regulatory standards. If using cables othe
than those supplied by Memotec, ensure that the capacitance does not exceed
2150pF. This can be calculated from the cable manufacturer’s specifications of
capacitance per foot (pF/Ft), which differs from one cable to the next.
4.2.2 Speeds Supported by the V.35EU Serial I/O
The V.35EU Serial I/O card supports asynchronous or synchronous transmission
at speeds up to T1/E1.
The V.35 port can operate, without split clocking, at the following speeds:
• 50 bps - 2,048 Kbps for external clocking
• 375 bps - 2,048 Kbps for internal clocking
4.2.3 DTE/DCE Interface Configuration
The V.35EU Serial I/O Card’s port can be configured either as a DTE or a DCE
device. The DCE/DTE strapping has been silk-screened on the I/O card to aid in
configuration.
DCE
When configured as a DCE device, the port transmits DCD, DSR and CTS and the
synchronous clock signals TXC and RXC. The port must receive DTR and RTS
from the attached DTE. Terminals, printers, controllers and hosts are always DTE
devices.
Figure 4-5 V.35EU Serial I/O Card, Connector Plate
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