SW2-4 and SW2-5: Clock Source
Switches SW2-4 and SW2-5 are set in combination to determine
the synchronous clock source for the Model 1035.
SW2-4
SW2-5
Setting
On
On
Internal transmit clock
Off
On
Receive recover clock
On
Off
External transmit clock
SW2-6: Carrier Control Method
The setting for switch SW2-6 determines whether the carrier is
“constantly on” or “controlled by RTS”. This setting allows for operation
in switched carrier, multipoint and/or hardware handshaking
applications.
SW2-6
Setting
Off
Constantly on
On
Controlled by RTS
SW2-7 and SW2-8: RTS/CTS Delay
The combined settings for switches SW2-7 and SW2-8 determine
the amount of delay between the time the Model 1035 “sees” RTS and
when it sends CTS.
SW2-7
SW2-8
Setting
Off
Off
No delay
On
On
7ms
On
Off
53ms
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4.0 INSTALLATION
Once the Model 1035 is properly configured, it is ready to connect
to your system. This section tells you how to properly connect the
Model 1035 to the twisted pair, RS-232 and V.35 interfaces.
4.1 CONNECTION TO THE TWISTED PAIR INTERFACE
The Model 1035 supports communication between two RS-232
devices or two V.35 devices at distances to 6 miles and data rates to 64
Kbps. There are two essential requirements for installing the Model
1035:
1.
These units work in
pairs
. Therefore, you must have one Model
1035 (or a compatible model) at each end of a two twisted pair
interface.
2.
To function properly, the Model 1035 needs two twisted pairs of
metallic wire. These twisted pairs must be
unconditioned
, dry,
metallic wire, between 19 and 26 AWG (the higher number gauges
may limit distance somewhat). Standard dial-up telephone circuits,
or leased circuits that run through signal equalization equipment, or
standard, flat modular telephone type cable, are
not acceptable
.
For your convenience, the Model 1035 is available with two
different twisted pair interfaces: RJ-11 jack and RJ-45 jack.
4.1.1 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
The RJ-11 and RJ-45 connectors on the Model 1035's twisted pair
interface are pre-wired for a standard TELCO wiring environment (see
Figure 5). The signal/pin relationships are shown on the table on the
following page:
RJ-11
SIGNAL
RJ-45
SIGNAL
1...................GND
†
1 .................N/C
2...................RCV
2 .................GND
†
3...................XMT
3 .................RCV
4...................XMT
4 .................XMT
5...................RCV
5 .................XMT
6...................GND
†
6 .................RCV
7 .................GND
†
8 .................N/C
†
Connection to ground is optional
8