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Quantum and Evolution Series Installation and Operating Handbook
EIA530 in V.35 Mode
If
the
EIA
530
Edit/Unit/Interface/Terrestrial then the following interface description applies.
Min
Signal Description
Req
DATA CIRCUIT TOWARDS MODEM (TX)
Clock In
Data In
'
Sig
Valid In
'
Sig Accpt
d Out
'
Int
Tx Clock Out
DATA CIRCUIT FROM MODEM (RX)
Clock Out
Data Out
'
Sig
Valid Out
COMMON LINES
Signal Ground
Shield/Protective ground
Device (DTE) Ready In
Device (DCE) Ready Out
Local Loop In
Remote Loop In
The maximum data rate is 10Mbps (over good quality twisted pair screened cable), but this
rate is reduced as the connecting cables extend beyond 10m. As an estimate, assume the
maximum rate halves as the distance doubles (ie 5Mbps to 20m, 2.5Mbps to 40m etc.).
The input clock/data phase is selected automatically, reporting a `Data Marginal` warning
whenever it has to switch phase. If the modem reports Data Marginal frequently then this is
not a modem fault but an indication that you have a clocking problem external to the
modem (ie changing clock/data phase, a problem which would otherwise have caused
untraceable data errors). With the Tx Clocking Set to Tx Clock In the `Data In` signal is
connector
is
fitted
V.35
Circuit
Name
Number
SCTE
113
SD
103
RTS
105
CTS
106
SCT
114
SCR
115
RD
104
RLSD
109
SG
102
FG
101
DTR
108
DSR
107
LL
141
RL
140
10-6
and
V.35
signals
25 pin
Electrical
Levels
A
B
24
11
V.35
2
14
V.35
4
RS232
5
RS232
15
12
V.35
17
9
V.35
3
16
V.35
8
RS232
7
Ground
1
Screen
20
RS232
6
RS232
18
RS23
2
21
RS23
2
are
selected
under
Old Style
Winchester
U & W
P & S
C
D
Y & aa
V & X
R & T
F
B
A
H
E
-
-
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