参数资料
型号: DS21Q58
英文描述: E1 Quad Transceiver
中文描述: E1四收发器
文件页数: 48/74页
文件大小: 647K
代理商: DS21Q58
DS21Q58 E1 Quad Transceiver
48 of 74
21.2 Receive Monitor Mode
When connecting to a monitor port, a large resistive loss is incurred due to the voltage divider between the E1 line
termination resistors (Rt) and the monitor port isolation resistors (Rm) as shown in
Figure 21-1
. The four receivers
of the DS21Q58 can provide gain to overcome the resistive loss of a monitor connection. This is typically a purely
resistive loss/gain and should not be confused with the cable loss characteristics of an E1 transmission line. By
setting the CCR7 register as shown in
Table 21-1
, the receiver can be programmed to provide 30dB of gain.
Figure 21-1. Typical Monitor Port Application
PRIMARY
E1 TERMINATING
DEVICE
Rm
Rm
MONITOR
PORT JACK
E1 LINE
X
F
M
R
Rt
DS21Q58
SECONDARY
TERMINATING
DEVICE
Table 21-1. Receive Monitor Mode Gain
CCR7 (ADDRESS = 1Fh)
REGISTER VALUE
7Xh
0Xh
GAIN (dB)
30
0
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