DS21Q58L+ Maxim Integrated Products, DS21Q58L+ Datasheet - Page 48

• Manufacturer Part Number: DS21Q58L+
• Description: IC TXRX E1 QUAD 3.3V 100LQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q58L+

• Function: Transceiver
• Interface: E1
• Number Of Circuits: 4
• Voltage - Supply: 3.14 V ~ 3.47 V
• Current - Supply: 230mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Includes: AIS Alarms Detector and Generator, Loopback Functions, PRBS Generator / Detector, Remote Detector and Generator
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -

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
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
Figure 21-1. Typical Monitor Port Application
Table 21-1. Receive Monitor Mode Gain
CCR7 (ADDRESS = 1Fh)
REGISTER VALUE
7Xh
0Xh
E1 LINE
Rm
MONITOR
PORT JACK
Table
Rm
21-1, the receiver can be programmed to provide 30dB of gain.
PRIMARY
E1 TERMINATING
DEVICE
GAIN (dB)
48 of 74
30
0
X
F
M
R
SECONDARY
TERMINATING
DEVICE
Rt DS21Q58
Figure
21-1. The four receivers