Connector pin assignments – Nortel Networks Circuit Card 311 User Manual

Page 1095

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Connector pin assignments

1095

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High-speed interface: The high-speed interface combines features of
the RS-422-A standard for the data and timing signals with standard
RS-232-C control signals. It is used when the signal rate is greater than
19.2 kbps and/or when the distance between the system and host is
greater than 15.24 m (50 ft). No modems are needed if the distance is
less than 30.48 m (100 ft).

The high-speed interface uses a proprietary pin assignment, rather than
the standard 37-pin RS-449 arrangement. This pin arrangement is
compatible with the Spectron Cable #75-025 for V.35 use. See

Table

446 "Connector J1 and J2 pin assignments - high-speed interface"
(page 1096)

The data and timing signals on the high-speed interface use RS-422-A
type differential line drivers and receivers in a balanced configuration.
These drivers and receivers are able to drive higher data rate signals
over longer distances than standard RS-232-C drivers and receivers. A
typical connection using these drivers and receivers is shown in

Figure

311 "Typical high-speed interface line driver and receiver" (page 1095)

Figure 311
Typical high-speed interface line driver and receiver

Connector pin assignments

Table 445 "Connector J1 and J2 pin assignments - RS-232-C interface"
(page 1096)

shows the pin assignments for J1 and J2 when the port is

configured for RS-232-C interface, and

Table 446 "Connector J1 and J2 pin

assignments - high-speed interface" (page 1096)

shows the pin assignments

for J1 and J2 when the port is configured for the high-speed interface.

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