DS26334 Dallas Semiconductor, DS26334 Datasheet - Page 22

• Manufacturer Part Number: DS26334
• Description: E1/T1/J1 Shortand Long-Haul Line Interface Unit
• Manufacturer: Dallas Semiconductor

5.4.1 Transmit Line Templates
The DS26334 transmitters can be selected individually to meet the pulse masks for E1 and T1/J1 mode. The T1/J1
pulse mask is shown in the Transmit Pulse Template and can be configured on an individual LIU basis. The
transmit template is selected via the TS[2:0] bits in the
the TIMPOFF and the TIMPRM bits of the same register. When transmit impedance matching is enabled TIMPRM
will select between 75Ω and 120Ω impedance if an E1 template is selected, and between 100Ω and 110Ω
impedance if a T1/J1 template is selected. In E1 mode, if 75Ω is selected via the TIMPRM bit, the output pulse
amplitude will be 2.37V, if 120Ω is selected via the TIMPRIM bit, the output pulse amplitude will be 3.0V.
The E1 pulse template is shown in
Table 5-4. Template Selections for Short-Haul Mode
Table 5-5. Template Selections for Long-Haul Mode
TS2, TS1, TS0
TS2, TS1, TS0
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
Figure 5-7
DSX-1 (133–266ft)
DSX-1 (266–399ft)
DSX-1 (399–533ft)
DSX-1 (533–655ft)
DSX-1 (0–133ft)
APPLICATION
APPLICATION
-7.5dB CSU
DS26334 3.3V, 16-Channel, E1/T1/J1 Short/Long-Haul Line Interface Unit
-15dB CSU
-22dB CSU
Reserved
Reserved
0dB CSU
E1
E1
and the T1 pulse template is shown in
22 of 121
TS
register. Transmit impedance matching is selected using
Figure
5-6.