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COMSPHERE 3600 Series Data Service Units
C-10 March 1999 3610-A2-GB41-60
Table C-4
EIA-232-D/V.24 Connector (Port 1)
Pin
Circuit Name
F nction
Pin
EIA-232-D CCITT/V.24
Function
2 BA 103 Transmit Data (TXD)
3 BB 104 Received Data (RXD)
4 CA 105 Request-to-Send (RTS)
5 CB 106 Clear-to-Send (CTS)
6 CC 107 Data Set Ready (DSR)
7 AB 102 Signal Ground (SG)
8 CF 109 Received Line Signal Detect (LSD)
9 — — Positive Test Voltage
10 — — Negative Test Voltage
12 CI 112 Data Signal Rate Selector I — DCE Source (alternate external
control lead I)
13
1
— — Data Signal Rate Selector II — DCE Source (alternate external
control lead II)
15 DB 114 Transmitter Signal Element Timing — DCE Source
17 DD 115 Receiver Signal Element Timing — DCE Source
18 LL 141 Local Loopback (LL)
19
1
— — Data Signal Rate Selector II — DTE Source (alternate external
control alarm Lead II)
20 CD 108.2 Data Terminal Ready (DTR)
21 RL 140 Remote Digital Loopback (RL)
22 CE 125 Ring Indicator (RI)
2
23 CH 111 Data Signal Rate Selector I — DTE Source (alternate external
control alarm Lead I)
24 DA 113 Transmitter Signal Element Timing — DTE Source
25 TM 142 Test Mode (TM)
1
The Data Signal Rate Selector functions are not supported for leads 13, 19, and 23. These leads can be
used for the external lead functions.
2
Ring Indicator is only available on a DBM-V, DBM-S, or DBM-D at this time.