Table B-1.

Modem/Computer Interface Connections (Continued)

 

EIA/TIA

 

 

 

Pin

232-D

ITU V.24

Signal

Definition

 

 

 

 

 

12

CI

112

Data Signal Rate

CI (112) is passed from modem to terminal, indicating signaling rate.

 

 

 

Indicator

When signal is on, modem operates at 2400 bps or greater. When

 

 

 

 

signal is off, modem operates below 2400 bps.

13

110

Signal Quality

Signal passes from modem to terminal indicating signal quality of

 

 

 

 

telephone line. When signal is on, signal quality is acceptable. When

 

 

 

 

signal is off, signal quality is poor.

14

Ext Select

(All models.) Signal passed from terminal to modem to select between

 

 

 

 

two option sets. Works in conjunction with Ext Select option.

 

 

 

 

(Models 3261/3263/3266/3268 only.) Signal passed from terminal to

 

 

 

 

modem indicating whether to use a dial line or a leased line. When

 

 

 

 

signal is on, modem uses a dial line. When signal is off, modem uses a

 

 

 

 

leased line. This signal is used in Restoral mode only.

15

DB

114

Transmitter

Local modem sends an internally generated transmit timing signal to

 

 

 

Signal Element

local terminal to synchronize transmitted data (TXD). See

 

 

 

Timing

Clock=Internal.

16

117

Standby Indicator

(Models 3261/3263/3266/3268 only.) Signal passed from modem to

 

 

 

 

terminal indicating type of line in use. When signal is on, modem is on

 

 

 

 

a dial line. When signal is off, modem is on a leased line. This signal is

 

 

 

 

used in Restoral mode only.

17

DD

115

Receive Signal

Timing signal extracted from the received carrier. Local modem

 

 

 

Element Timing

transmits this signal to the DTE to synchronize received data (RXD).

18

141

Local Analog

Initiated at local terminal and passed to local modem, causing it to

 

 

 

Loopback Test

initiate local analog loopback test.

19

Not used.

20

CD

108.1/

Data Terminal

108.1—Sent by DTE; causes the modem to connect to the phone line.

 

 

108.2

Ready (DTR)

 

 

 

 

 

108.2—Sent by DTE; allows the modem to connect to the phone line.

21

140

Remote Digital

Signal initiated at local terminal and passed to local modem, causing it

 

 

 

Loopback Test

to initiate remote digital loopback test (V.54 Loop 2).

22

CE

125

Ring Indicator

Passed from local modem to local terminal. On during ringing, off

 

 

 

(RI)

between rings and when no ring received.

23

CH/CI

111/112

Data Signal Rate

CI passed from modem to terminal indicating signaling rate. CI is set

 

 

 

Select/Indicator

high for data rates greater than 2400 bps; otherwise, it is set low. CI is

 

 

 

 

also set low while the modem is disconnected. The function of this pin

 

 

 

 

is determined by the setting of rear panel Switch 1. CH (input) signal

 

 

 

 

has no effect on modem operation.

24

DA

113

External Signal

Transmit timing signal generated by some synchronous DTEs,

 

 

 

Element Timing

providing clock to the local modem. See Clock=External setting.

25

142

Test Indicate (TI)

Local modem signals to local terminal when local modem is in test.

 

 

 

 

The terminal can initiate a Busy Out condition on this circuit. The

status of this signal is determined by the status of rear panel Switch 2 and front panel option DTE Pin 25 configured for Test or Busy.

 

 

 

 

 

Pinouts

Interface

 

 

 

 

 

 

 

 

 

Cabling and Interface Pinouts B-3

Page 165
Image 165
Telenetics V.34-SDC, 326X V.34, V.32bis Series manual Models 3261/3263/3266/3268 only. Signal passed from modem to

326X V.34, V.32bis Series, V.34-SDC specifications

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