Telephone Line Connection; Pstn Connection - Motorola V.3400 User Manual

Table 2-1. Digital Interface Signal Descriptions (Continued)
Pin EIA- CCITT
No. 232D V.24
24 DA
25

TELEPHONE LINE CONNECTION

The modem operates in one of three line-related modes:
• Permissive (PSTN)
• Programmable (PSTN)
• Private line
Permissive and programmable modes are used on the Public Switched
Telephone Network (PSTN). Private line mode is used on 4-wire or 2-
wire leased lines. The user must decide which mode to use and then
select the telephone jack arrangement.

PSTN Connection

Modems are registered with the Federal Communications Commission
(FCC) for direct connection to the PSTN (dial-up network). The label
on the chassis bottom gives the FCC registration number and other
information required for network operation.
Direct connection to the PSTN provides two modes of operation
(Figure 2-3):
• Permissive (standard domestic or home use)
• Programmable
Signal
Name
113 External
Transmit
Clock
142
Test Mode
Description
A serial data rate clock input from the data
source. Positive clock transitions corre-
spond to data transitions.
Indicates the modem is in a test mode
V.3400
Installation
2-5