DS21Q50L Maxim Integrated Products, DS21Q50L Datasheet - Page 42

• Manufacturer Part Number: DS21Q50L
• Description: IC TRANSCEIVER E1 QUAD 100-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of DS21Q50L

• 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: Contains lead / RoHS non-compliant
• Power (watts): -

7. DS0 MONITORING FUNCTION
Each DS21Q50 framer can monitor one DS0 (64kbps) channel in the transmit direction and one DS0
channel in the receive direction at the same time. In the transmit direction, the user determines which
channel is to be monitored by properly setting the TCM0 to TCM4 bits in the CCR3 register. In the
receive direction, the RCM0–RCM4 bits in the CCR4 register need to be properly set. The DS0 channel
pointed to by the TCM0–TCM4 bits appear in the transmit DS0 monitor (TDS0M) register; the DS0
channel pointed to by the RCM0–RCM4 bits appear in the receive DS0 (RDS0M) register. The TCM4–
TCM0 and RCM4–RCM0 bits should be programmed with the decimal decode of the appropriate E1
channel. For example, if DS0 channel 6 in the transmit direction and DS0 channel 15 in the receive
direction need to be monitored, the following values are programmed into CCR4 and CCR5:
Register Name:
Register Description:
Register Address:
Bit
Name
NAME
TCM4
TCM3
TCM2
TCM1
TCM0
LIAIS
RLB
LLB
RLB
7
BIT
7
6
5
4
3
2
1
0
LLB
Remote Loopback
Local Loopback
Line Interface AIS Generation Enable
Transmit Channel Monitor Bit 4. MSB of a channel decode that determines which transmit
channel data appears in the TDS0M register. See Section
Transmit Channel Monitor Bit 3
Transmit Channel Monitor Bit 2
Transmit Channel Monitor Bit 1
Transmit Channel Monitor Bit 0. LSB of the channel decode.
6
CCR3 (Repeated here from Section
Common Control Register 3
14 Hex
LIAIS
5
TCM4 = 0
TCM3 = 0
TCM2 = 1
TCM1 = 0
TCM0 = 1
TCM4
4
42 of 87
TCM3
RCM4 = 0
RCM3 = 1
RCM2 = 1
RCM1 = 1
RCM0 = 0
3
3
FUNCTION
for convenience.)
TCM2
2
TCM1
6
1
or details.
TCM0
0