14 Ensure that the modem is set up as follows:
• Automatic answer must be enabled
• Dialing
is
bit synchronous (high-level data link control [HDLC])
• Protocol is HDLC with ASCII
• Call origination must be enabled
15 Ensure that the modem is set up so that the modem interface signals are controlled as shown
in
the following table.
Circuit
Abbreviation
CCITT
Pin
Comments
Transmit Data
XD
103 2 Controlled by DTE
Receive Data RD 104 3
Received from DCE
Request to Send ATS 105
4
Controlled by DTE
Ready for Sending CTS/RFS 106 5
Received from DCE
Follows ATS (circuit 105, pin 4)
Data Set Ready DSR
107
6
Received from DCE
Indicates connection is made
Data Terminal Ready DTR 108
20
Controlled by DTE
Receive Line Signal Detect CD 109
8
Not used
Data Signal Rate Select RATE
111
23
Controlled by DTE
Transmit Signal Element Timing
DTE 113 24
Not used
from DTE
Transmit Signal Element Timing
TCLK 114 15 Must be provided by DCE
from DCE
Receive Signal Element Timing RCLK
115 17 Must be provided by DCE
Select Standby STBY 116
11
Not
used
Calling Indicator
RI
/Cl 125 22 Must be provided by DCE
Loopback Maintenance Test ALB 140
21
Controlled by DTE
Must be enabled
in
DCE
Local Loopback LLB
141
18
Controlled by DTE
Must
be
enabled in DCE
Test Indicator Tl 142
25
Not
used
Channel Select
cs
126
11
Not used
Data Rate Indicate
ORI
112
12 Not used
Note:
CCI
TT
= International Telegraph and Telephone Consultative Committee
DTE = Data terminal equipment (system)
DCE = Data communications equipment (modem)
16 All other modem functions should remain as set by the modem manufacturer.
Go to step 18 of this procedure.
4-4 AS/4
00
94
01
In
sta
llation - Models P03 and 10S V3R1
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