DS26334 Dallas Semiconductor, DS26334 Datasheet - Page 60

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

Register Name:
Register Description:
Register Address (LIUs 1–8):
Register Address (LIUs 9–16):
Bit #
Name
Default
Note: This register configures each LIU individually. This register configures the LIU selected by TST.TST[2:0].
Bit 7: Receive Impedance Match On (RIMPON). If this bit is set, internal receive impedance matching is turned
on. Otherwise, the receiver is in high impedance. Note that the OE pin can have control instead of this bit when the
TST.RHPMC bit is set.
Bit 6: Transmit Impedance Termination Off (TIMPOFF). If this bit is set all the internal transmit terminating
impedance is turned off.
Bit 3: Transmit Impedance Receive Match (TIMPRM). This bit selects the internal transmit termination
impedance and receive impedance match for E1 mode and T1/J1 mode.
Bits 2 to 0: Template Selection [2:0] (TS[2:0]). Bits TS[2:0] are used to select E1 or T1/J1 mode, the template,
and the settings for various cable lengths. The impedance termination for the transmitter and impedance match for
the receiver are specified by bit TIMPRM. Short-haul or long-haul operation is selected by the SHLHS bit in the
individual registers
Table 6-13. Template Selection
001 and 010
TS[2:0]
011
100
101
110
111
000
011
100
101
110
RIMPON
7
0
0 = 75Ω for E1 mode or 100Ω for T1 mode.
1 = 120Ω for E1 mode or 110Ω for J1 mode.
SHLHS
LINE LENGTH (ft)
133–266 ABAM
266–399 ABAM
399–533 ABAM
533–655 ABAM
G.703 coaxial and twisted pair cable
0–133 ABAM
-22.5dB CSU
-7.5dB CSU
-15dB CSU
TIMPOFF
Reserved
0db CSU
(07). See
6
0
TS
Template Select Register
11h
31h
Table 6-13
TEMPLATE SELECTION
DS26334 3.3V, 16-Channel, E1/T1/J1 Short/Long-Haul Line Interface Unit
—
5
0
CABLE LOSS
for bit selection of TS[2:0].
60 of 121
(dB)
0.6
1.2
1.8
2.4
3.0
—
—
—
—
—
—
4
0
TIMPRM
3
0
IMPEDANCE
100/110
100/110
100/110
100/110
100/110
100/110
100/110
100/110
100/110
75/120
(Ω)
—
TS2
0
2
OPERATION MODE
E1 Short/Long Haul
T1/J1 Short Haul
T1/J1 Long Haul
T1/J1 Long Haul
T1/J1 Long Haul
T1/J1 Long Haul
Short/Long Haul
T1 Short Haul
T1 Short Haul
T1 Short Haul
T1 Short Haul
TS1
1
0
TS0
0
0