IDT82V2082_09 Datasheet, PDF (50/88 Pages) Integrated Device Technology – DUAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT

IDT82V2082
DUAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
Table-32 TCF1: Transmitter Configuration Register 1
(R/W, Address = 05H, 25H)
Symbol
Bit Default
Description
-
7-6
00 Reserved. This bit should be ‘0’ for normal operation.
DFM_OFF
5
0 Transmit driver failure monitor disable
= 0: DFM is enabled
= 1: DFM is disabled
THZ
4
1 Transmit line driver high impedance enable
= 0: Normal state
= 1: Transmit line driver high impedance enable (other transmit path still work normally).
PULS[3:0]
3-0
0000 These bits select the transmit template/LBO for short-haul/long-haul applications.
T1/E1/J1
TCLK
Cable impedance Cable range or
LBO
0000¹
E1
2.048 MHz
75 Ω
-
0001
E1
2.048 MHz
120 Ω
-
0010
DSX1
1.544 MHz
100 Ω
0-133 ft
0011
DSX1
1.544 MHz
100 Ω
133-266 ft
0100
DSX1
1.544 MHz
100 Ω
266-399 ft
0101
DSX1
1.544 MHz
100 Ω
399-533 ft
0110
DSX1
1.544 MHz
100 Ω
533-655 ft
0111
J1
1.544 MHz
110 Ω
0-655 ft
1000
DS1
1.544 MHz
100 Ω
0 dB LBO
1001
DS1
1.544 MHz
100 Ω
-7.5 dB LBO
1010
DS1
1.544 MHz
100 Ω
-15.0 dB LBO
1011
DS1
1.544 MHz
100 Ω
-22.5 dB LBO
11xx
User programmable waveform setting
Allowable Cable
loss
0-43 dB
0-43 dB
0-0.6 dB
0.6-1.2 dB
1.2-1.8 dB
1.8-2.4 dB
2.4-3.0 dB
0-3.0 dB
0-36 dB
0-28.5 dB
0-21 dB
0-13.5 dB
1. In internal impedance matching mode, for E1/75 Ω cable impedance, the PULS[3:0] bits (TCF1, 05H...) should be set to ‘0000’. In external impedance matching
mode, for E1/75 Ω cable impedance, the PULS[3:0] bits should be set to ‘0001’.
Table-33 TCF2: Transmitter Configuration Register 2
(R/W, Address = 06H, 26H)
Symbol
Bit
Default
Description
-
7-6
00 Reserved.
SCAL[5:0]
5-0
100001 SCAL specifies a scaling factor to be applied to the amplitude of the user-programmable arbitrary pulses which is
to be transmitted if needed. The default value of SCAL[5:0] is ‘100001’. Refer to 3.3.3.3 User-Programmable Arbi-
trary Waveform.
= 110110: Default value for T1 0~133 ft, T1 133~266 ft, T1 266~399 ft, T1 399~533 ft, T1 533~655 ft, J1 0~655 ft
and DS1 0 dB LBO. One step change of this value results in 2% scaling up/down against the pulse amplitude.
=010001: Default value for DS1 -7.5 dB LBO. One step change of this value results in 6.25% scaling up/down
against the pulse amplitude.
= 001000: Default value for DS1 -15.0 dB LBO. One step change of this value results in 12.5% scaling up/down
against the pulse amplitude.
= 000100: Default value for DS1 -22.5 dB LBO. One step change of this value results in 25% scaling up/down
against the pulse amplitude.
= 100001: Default value for E1 75 Ω and 120 Ω. One step change of this value results in 3% scaling up/down
against the pulse amplitude.
PROGRAMMING INFORMATION
50
May 4, 2009