Memotec CX900e, Hardware Reference Manual, Page: 63 / 200

5 SERIAL I/O CARDS
3006M100-002
5-11
Cable
The V.35H Serial I/O Card connects to external devices through either of two
separately-ordered cables:
• three-meter (10 ft) shielded, twisted pair cable with a male DB-25 connector at one
end and a male M-34 block connector at the other (part no. CBLA0014-010)
• three-meter (10 ft) shielded, twisted pair cable with a male DB-25 connector at one
end and a female M-34 block connector at the other (part no. CBLA0014-210)
5.3.2 Speeds Supported by the V.35H Serial I/O
The V.35H Serial I/O card supports asynchronous or synchronous transmission at
speeds up to T1/E1.
Speed for slots
1 to 4
The V.35 port at slots 1 to 4 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
Speed for slots
5 and 6
The V.35 port at slots 5 and 6 can operate, without split clocking, at the following
speeds:
• 50 bps - 256 Kbps for external clocking
• 1,875 bps - 256 Kbps for internal clocking
5.3.3 DTE/DCE Interface Configuration
The V.35H 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.
DTE
When configured as a DTE device, the port transmits DTR, RTS and ETXC and
receives DCD, DSR and CTS and the synchronous clock signals TXC and RXC
from the attached DCE.
A jumper bank socketed at U9 provides DTE/DCE configuration. Permanent
metal bands on the top surface of the jumper bank strap signals according to DCE/
DTE requirements. The orientation of the jumper bank determines whether the
port will be DTE or DCE. Rotating the jumper 180° changes the port from one