参数资料
型号: DS26503L
英文描述: T1/E1/J1 BITS Element
中文描述: T1/E1/J1收发BITS的元素
文件页数: 82/123页
文件大小: 995K
代理商: DS26503L
DS26503 T1/E1/J1 BITS Element
82 of 123
13.7 LIU Control Registers
Register Name:
Register Description:
Register Address:
Bit #
7
Name
L2
Default
0
HW
Mode
PIN 13
Bit 0/Transmit Power-Down (TPD).
0 = powers down the transmitter and tri-states the TTIP and TRING pins
1 = normal transmitter operation
Bit 1/Disable Jitter Attenuator (DJA).
0 = jitter attenuator enabled
1 = jitter attenuator disabled
Bit 2/Jitter Attenuator Buffer Depth Select (JABDS).
0 = 128 bits
1 = 32 bits (use for delay-sensitive applications)
Bit 3/Jitter Attenuator Select (JAS).
0 = place the jitter attenuator on the receive side
1 = place the jitter attenuator on the transmit side
Bit 4/Receive Equalizer Gain Limit (EGL).
This bit controls the sensitivity of the receive equalizer.
T1 Mode:
0 = -36dB (long haul)
1 = -15dB (limited long haul)
E1 Mode:
0 = -43dB (long haul)
1 = -12dB (short haul)
Bits 5-7/Line Build-Out Select (L0 to L2).
When using the internal termination, the user needs only to select 000 for 75
operation or 001 for 120
operation. This selects the proper voltage levels for 75
or 120
operation. Using TT0 and TT1 of
the LICR4 register, users can then select the proper internal source termination. Line build-outs 100 and 101 are for backwards
compatibility with older products only.
E1 Mode
L2
L1
L0
APPLICATION
N (1)
0
0
0
75
normal
1:2
0
0
1
120
normal
1:2
1
0
0
75
with high return loss*
1:2
1
0
1
120
with high return loss*
1:2
LIC1
Line Interface Control 1
30h
6
L1
0
L1
5
L0
0
L0
4
3
2
1
0
EGL
0
JAS
0
JABDS
0
DJA
0
TPD
0
L2
PIN 12
PIN 11
0
0
0
0
1
RETURN LOSS
N.M.
N.M.
21dB
21dB
Rt (1)
0
0
6.2
11.6
*
TT0 and TT1 of LIC4 register must be set to zero in this configuration.
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