IDT82P2284 Integrated Device Technology, Inc., IDT82P2284 Datasheet - Page 101

• Manufacturer Part Number: IDT82P2284
• Description: 4 Channel T1/J1/E1 Transceiver
• Manufacturer: Integrated Device Technology, Inc.

IDT82P2284
3.26
ized by using internal impedance matching circuit. 100 Ω, 110 Ω, 75 Ω
or 120 Ω internal impedance matching circuit can be selected by the
T_TERM[1:0] bits. The external impedance circuitry is not supported in
T1/J1 mode.
by using internal impedance matching circuit or external impedance
matching circuit. When the T_TERM[2] bit is ‘0’, the internal impedance
matching circuit is enabled. 100 Ω, 110 Ω, 75 Ω or 120 Ω internal
impedance matching circuit can be selected by the T_TERM[1:0] bits.
When the T_TERM[2] bit is ‘1’, the internal impedance matching circuit
is disabled, and different external resistors should be used to realize dif-
ferent impedance matching.
cable for one link. Table 75 lists the recommended impedance matching
values for the transmitter.
Table 75: Impedance Matching Value For The Transmitter
Table 76: Related Bit / Register In Chapter 3.25 & Chapter 3.26
Configuration
120 Ω (E1)
100 Ω (T1)
110 Ω (J1)
75 Ω (E1)
T_TERM[2:0]
In T1/J1 mode, the transmitter impedance matching can be real-
In E1 mode, the transmitter impedance matching can be realized
Figure 2 shows the appropriate components to connect with the
Cable
DFM_ON
DF_IES
DF_IS
DF_IE
DF_S
T_HZ
XTS
Bit
TRANSMITTER IMPEDANCE MATCHING
T_TERM[2:0]
Transmit And Receive Termina-
Internal Termination
Interrupt Trigger Edges Select
0 0 0
0 0 1
0 1 0
0 1 1
Interrupt Enable Control 0
Transmit Configuration 1
Transmit Timing Option
Line Status Register 0
tion Configuration
Interrupt Status 0
Register
0 Ω
R
T
T_TERM[2:0]
External Termination
1 X X
03A, 13A, 23A, 33A
-
-
070, 170, 270, 370
036, 136, 236, 336
035, 135, 235, 335
033, 133, 233, 333
023, 123, 223, 323
032, 132, 232, 332
Address (Hex)
9.4 Ω
R
-
-
T
90
QUAD T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
March 22, 2004