Specifications
166119 8/31/2006
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2.1.7 Channel Port Operation
The 16 channel ports may be configured individually according to their various port options.
All ports are implemented as DCE interfaces and provide clocking to the attached terminal
equipment.
Any supported channel rate may be configured on any channel, from 1200 bps to 64Kbps.
The only remaining limitation being that the aggregate channel rate of all ports may not
exceed the available user bandwidth of the composite link. The channel rate applies to both
channel port pairs and both ports must operate at the same rate.
2.1.7.1 Hardware Interface Options
Any of the 16 channel ports will operate as RS-232 interface types. In addition, each of the
four quad I/O port cards possesses a single port that can be configured as an EIA-530
interface, or a V.35 type interface (RS-449 and X.21 port connectors are supported through
an attached adapter cable with EIA-530 operation; V.35 requires an adapter cable for a
compatible port connector.)
2.1.7.2 Sync and Async Timing Modes
Each channel port may be configured for operation in either RS-232 synchronous or
asynchronous mode. For asynchronous mode, in order to properly set up the port, the user
must be aware of the character size and stop, start, and parity settings of the terminal
equipment. The bandwidth required on the composite link for asynchronous channels is equal
to the baud rate.
Both ports comprising a channel must be configured in identical timing modes (i.e., both sync
or both async).
If a channel port is set to operate as an EIA-530 or V.35 interface, it must use synchronous
timing.
2.1.7.3 Clocking Option
Although the channel ports cannot accept asynchronous clock timing from an attached
device, each port can be configured to receive the transmit clock on the TxCE lead and use
this signal for clocking in the data on the TxD lead.
In this case, it is up to the user to configure the attached equipment to synchronize with the
outgoing RxC or TxC, otherwise data errors will occur.
2.1.7.4 RTS / CTS Delay Option
An option exists on each channel port to configure the CTS control lead signal level output to
follow the RTS control lead signal level input at the port. Various delays may be selected,
from zero delay up to 53mS. Additionally, the CTS control lead may be set to either an ON
state or an OFF state.
2.1.7.5 DCD Source Option
The DCD (RLSD) control signal lead at the channel port may be configured for one of two
modes.