Specifications

LDM-MR19.2

Table 3-1. DB25 Pinout and Interface-Signal List (continued)

CCITT EIA DTE SIGNAL

V.24 RS-232-C PIN NAME DESCRIPTION

109 CF 8 Receive Line The LDM-MR19.2 always sends a “high”

Signal Detector (positive) level to the local DTE except when

(Carrier Detect) the LDM-MR19.2 detects carrier loss or is in

local or remote digital loopback.

113 DA 24 External Trans. Synchronous data-rate-clock input received

Signal Element from the local DTE. Governs the Transmitted

Timing Data signal. See the Note below.

114 DB 15 Transmitter Synchronous data-rate-clock output sent to

Signal Element the local DTE. Governs the Transmitted Data

Timing signal. See the Note below.

115 DD 17 Receiver Signal Synchronous data-rate-clock output sent to

Element Timing the local DTE. Governs the Received Data

signal. See the Note below.

142 25 Test Indicator The LDM-MR19.2 sends a “high” (positive)

level to the local DTE during any test mode.

141 18 Loop 3 When it receives this control signal from the

Test Command local DTE, the LDM-MR19.2 goes into Local

Analog Loopback.

140 21 Loop 2 When it receives this control signal from the

Test Command local DTE, the LDM-MR19.2 forces the

remote modem into Remote Digital Loopback.

NOTE: When the LDM-MR19.2 is operating synchronously, transitions of the Transmitted Data and

Received Data signals happen at the same time as positive-going (“rising edge”) transitions of the active

clock signal.