Filter
Top Products
17
CHAPTER 3: Configuration
3.3 Configuring the Standalone or Card Version
Before attaching anything to the 256-kbps Line Driver standalone or rackmount
card version, determine which data rate you’re going to use, what the system’s
clock source should be, and how you want to set all of the other user-configurable
options on the line driver. (Refer to Table 3-1 on the next two pages for a list of all
of these options; the SWn and Jn numbers in the table’s “Element” column
correspond to the locations with the same numbers in Figure 3-1.)
Table 3-1. User-configurable options.
Element Function Possible Standard
Settings Factory
Setting
SW3 Select the data rate in kilobits per second. Opt. 1
BAUD RATE 0-256
dial 1-192
2-144
3-128
4-115.2*
5-112
6-96
7-72
8-64 64 kbps
9-57.6*
A-56
B-48
C-38.4*
D-32
E-28.8
F-19.2*
*Async/
sync baud
rate
J1 Enable or disable requests for V.54 digital DIS
V54 DIS loopback tests from the remote line driver. EN EN (enabled)
jumper
J2 Select the transmit-carrier mode. When you CNTRL
CARRIER set this jumper to “ON,” transmit carrier is ON ON
jumper constantly ON. When you set this jumper to
jumper to “CNTRL,” transmit carrier is ON only
when RTS is high.
Use the CNTRL setting for multipoint
applications.
J3 Select the source of the transmit timing signal: INT INT (Internal)
XMT CLK internal clock, external clock (from DTE), or EXT
jumper receive clock (from remote unit). Do not select RCV
the ASY (asynchronous, no clock) setting. ASY
SW2 (This switch only comes into play when ASY
Data-format [asynchronous] is selected on jumper J3. ASY
DIP switch should never be selected on this unit, so the
settings of this switch are irrelevant.)