Datasheet

DS26504 T1/E1/J1/64KCC BITS Element
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T1 Mode
L2 L1 L0 APPLICATION N (Note 1) RETURN LOSS Rt (Note 1)
0 0 0 DSX-1 (0 to 133 feet)/0dB CSU 1:2 N.M. 0
0 0 1 DSX-1 (133 to 266 feet) 1:2 N.M. 0
0 1 0 DSX-1 (266 to 399 feet) 1:2 N.M. 0
0 1 1 DSX-1 (399 to 533 feet) 1:2 N.M. 0
1 0 0 DSX-1 (533 to 655 feet) 1:2 N.M. 0
1 0 1 Reserved — — —
1 1 0 Reserved — — —
1 1 1 Reserved — — —
N.M. = Not meaningful
Note 1: Transformer turns ratio.
Register Name:
TLBC
Register Description:
Transmit Line Build-Out Control
Register Address:
34h
Bit # 7 6 5 4 3 2 1 0
Name — AGCE GC5 GC4 GC3 GC2 GC1 GC0
Default 0 0 0 0 0 0 0 0
HW
Mode
0 0 0 0 0 0 0 0
Bits 0 to 5: Gain Control Bits 0 to 5 (GC0 toGC5). The GC0 through GC5 bits control the gain setting for the nonautomatic
gain mode. Use the tables below for setting the recommended values. The LBO (line build-out) column refers to the value in
the L0–L2 bits in LIC1 (Line Interface Control 1) register.
NETWORK MODE LBO GC5 GC4 GC3 GC2 GC1 GC0
0 1 0 0 1 1 0
1 0 1 1 0 1 1
2 0 1 1 0 1 0
3 1 0 0 0 0 0
4 1 0 0 1 1 1
5 1 0 0 1 1 1
6 0 1 0 0 1 1
T1, Impedance Match Off
7 1 1 1 1 1 1
0 0 1 1 1 1 0
1 0 1 0 1 0 1
2 0 1 0 1 0 1
3 0 1 1 0 1 0
4 1 0 0 0 1 0
5 1 0 0 0 0 0
6 0 0 1 1 0 0
T1, Impedance Match On
7 1 1 1 1 1 1
0 1 0 0 0 0 1
1 1 0 0 0 0 1
4 1 0 1 0 1 0
E1, Impedance Match Off
5 1 0 1 0 0 0
0 0 1 1 0 1 0
E1, Impedance Match On
1 0 1 1 0 1 0
Bit 6: Automatic Gain Control Enable (AGCE)
0 = use Transmit AGC, TLBC bits 0–5 are “don’t care”
1 = do not use Transmit AGC, TLBC bits 0–5 set nominal level
Bit 7: Unused, must be set = 0 for proper operation.