Switches S2 and S3: Rate Adaptation (DTE Rate)
Set Switches S2 and S3 together to allow the Model 2703 to
adapt to terminal devices that run at data rates less than 2.048 Mbps
(The network rate remains 2.048 Mbps regardless of the terminal rate
adaptation setting). The setting you select must match the data rate of
your terminal device.
S2
S3
Setting
Off
Off
2.048 Mbps
On
Off
1.024 Mbps
Off On
512
Kbps
On
On
256 Kbps
Switches S4 and S5:
Reserved for Future Use
Switches S4 and S5 are reserved for future use and must remain
in the Off position.
Switch S6: Internal/Network Clock
Set Switch S6 to allow the Model 2703RC to provide an internal
clock, or recover the clock from the received G.703 input signal.
S6
Setting
On
Model 2703RC clock is internal
Off
Model 2703RC clock is recovered from the network
Switches S7 and S8:
Reserved for Future Use
Switches S7 and S8 are reserved for future use and must remain
in the Off position.
6
3.1 DIP Switches S1 - S8
The configuration switches on S1 - S8 may be used to set data
inversion, the DTE bit rate, and clocking modes. Default settings of S1
through S8 are shown in the table below. Descriptions of each switch
follow the table.
Switch S1: Data Inversion
Set Switch S1 to determine whether or not the data stream from
the local DTE is inverted within the Model 2703RC before being
passed to the G.703 network. You may need to invert the data stream
when you use the Model 2703RC with an imbedded G.703 device that
inverts the data on the remote end. Data inversion is typically not nec-
essary.
S1-1
Setting
On
Data inverted
Off
Data not inverted
5
Position
Function
Factory Default
S1
Data Inversion
Off
Non-Inverted
S2
Rate Adaptation (DTE Rate)
Off
S3
Rate Adaptation (DTE Rate)
Off
S4
Off
S5
Off
S6
Clock Mode
Off
Network
S7
Off
S8
Off
SWITCH SUMMARY TABLE
2.048 Mbps
}
Reserved
Reserved
NOTE: The PCM data stream must be inverted if this Model
2703RC is to be connected to a standalone Model 2703
Firmware Revision B (or older) unit at 256, 512, and 1024 kbps.
The firmware version of the standalone 2703 is printed on the
bottom side of the unit.
