14
Switch SW2.2 DS0 Channel Rate
This switch is used to set the DS0 rate in framed modes; in
unframed mode, this switch is used with SW2.1 to set the clocking
mode.
SW2.2
DS0 Rate
Off
56 kbps
On
64 kbps
Switch SW2.1 Clock Mode
This switch is used to select the timing source for transmitting data
to the T1 port. External clocking is available only in unframed mode
(DTE data rate of 1544 kbps).
NOTE: When using the Model 2090 to terminate a T1 port, the 2090
must be set to network clock. When using the Model 2090 as
a high-speed short range modem, one unit of the link must be
configured for Internal Clock mode, and the unit on the oppo
site end must be configured for Network Clock mode.
Function
SW2.2
SW2.1
Clocking Mode
Don’t Care
Off
Network
Don’t Care
On
Internal
Don’t Care
Off
Network
Off
On
Internal
On
On
External
CLOCKING AND FRAMING MODES
Framed Mode (ESF/D4)
Unframed Mode
13
4.0 INSTALLATION
The Model 2090 is equipped with a DTE, network, and power
interface. This section briefly describes connection to each.
4.1 DTE INTERFACE CONNECTION
The DTE interface is a V.35 DCE presented as an M/34 male con-
nector. This interface is designed to plug directly into a DTE interface
(See Appendix D for V.35 interface pin assignments).
4.2 NETWORK INTERFACE CONNECTION
The Network Line Interface is an eight position keyed modular jack
configured as a RJ-48C. This interface will need to be configured to
match the line parameters (i.e. framing, line coding) supplied by the
connected equipment.
NOTE: If the Model 2090 Series is being used for private short
range modem applications, the twisted pair cable connected to its
port will need to be a cross-over cable. See Appendix D for
Interface pin assignments.
4.3 POWER CONNECTION
The Model 2090 Series is powered via a supplied external trans-
former and is factory configured for either 120VAC or 100-240VAC
operation. This connection is via the barrel jack on the rear of the
2090. The Model 2090 can also be powered via the DTE interface
when supplied with +5VDC @ 300mA to Pin KK. See Appendix D for
more information.
DC Power Supply
The 36-60 VDC DC to DC adapter is supplied with the DC version of
the Model 2090. The black and red leads plug into a DC source (nomi-
nal 48VDC) and the barrel power connector plugs into the barrel power
supply jack on the 2090
.
To Power
Supply Jack
To -48VDC
Source
-Vin
+Vin
SWITCHING POWER SUPPL
Y
MODEL
: SYD1
106-0505
INPUT
: 36-60V 0.2A
MAX
OUTPUT
: +5V 1.0A
OUTPUT
POWER : 5W MAX
S/N
: G01234567890
MADE IN CHINA
BY
SUNNY
Black lead (-V)
Red lead (+V)
Barrel power connector
