DS26502 Maxim Integrated Products, DS26502 Datasheet - Page 81

• Manufacturer Part Number: DS26502
• Description: T1/E1/J1/64KCC BITS Element
• Manufacturer: Maxim Integrated Products

13.7 LIU Control Registers
Register Name:
Register Description:
Register Address:
Bit #
Name
Default
HW
Mode
Bit 0: Transmit Power-Down (TPD)
Bit 1: Disable Jitter Attenuator (DJA). Note: The jitter attenuator is only available in T1 and E1 modes.
Bit 2/Jitter Attenuator Buffer Depth Select (JABDS). Note: The jitter attenuator is only available in T1 and E1 modes.
Bit 3: Jitter Attenuator Select (JAS). Note: The jitter attenuator is only available in T1 and E1 modes.
Bit 4: Receive Equalizer Gain Limit (EGL). This bit controls the sensitivity of the receive equalizer.
Bits 5 to 7: Line Build-Out Select (L0 to L2). When using the internal termination, the user needs only to select 000 for 75Ω
operation or 001 for 120Ω operation. This selects the proper voltage levels for 75Ω or 120Ω 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
*TT0 and TT1 of LIC4 register must be set to zero in this configuration.
L2
0
0
1
1
0 = powers down the transmitter and tri-states the TTIP and TRING pins
1 = normal transmitter operation
0 = jitter attenuator enabled
1 = jitter attenuator disabled
0 = 128 bits
1 = 32 bits (use for delay-sensitive applications)
0 = place the jitter attenuator on the receive side
1 = place the jitter attenuator on the transmit side
T1 Mode: 0 = -36dB (long haul)
E1 Mode: 0 = -43dB (long haul)
L1
0
0
0
0
PIN 13
L2
L2
7
0
L0
0
1
0
1
1 = -15dB (limited long haul)
1 = -12dB (short haul)
75Ω normal
120Ω normal
75Ω with high return loss*
120Ω with high return loss*
PIN 12
L1
L1
LIC1
Line Interface Control 1
30h
6
0
APPLICATION
PIN 11
L0
L0
5
0
EGL
4
0
0
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N (1)
1:2
1:2
1:2
1:2
JAS
3
0
0
RETURN LOSS
JABDS
2
0
0
21dB
21dB
N.M.
N.M.
DS26502 T1/E1/J1/64KCC BITS Element
DJA
1
0
0
Rt (1)
11.6Ω
6.2Ω
TPD
0
0
0
0
1