ACS405CS Semtech Corporation, ACS405CS Datasheet - Page 8

• Manufacturer Part Number: ACS405CS
• Description: Acapella Optical Modem ic
• Manufacturer: Semtech Corporation

In order to select two independent E1 channels in
TX2 mode then set DR4 = DR3 = DR1 = 1; DR2 =
0, together with a crystal of 32.768MHz as shown
in the Table 9.
In order to select two independent E1 channels in TX2
mode then set DR4 = DR3 = 1; DR1 = DR2 = 0,
together with a crystal of 30.88MHz as shown in the
Table 10.
In order to select one E1 channel operating in High
Tolerance (HT) mode then set DR4 = DR2 = DR1 =
1; DR3 = 0, together with a crystal of 32.768MHz
as shown in the Table 11.
In order to double the available transmission distance
from 25km to 50km, the value of the crystal must be
reduced by half. For a single E1 channel set DR4 =
DR3 = DR2 = 0; DR1 = 1, together with a crystal of
16.384MHz as shown in Table 12.
2 * E1 Channel Selection
2 * T1 Channel Selection
1 * E1 Channel Selection HT mode
1 * E1 Channel Selection at 50km
DR4
DR4
DR4
DR4
1
crystal = 32.768 MHz
1
crystal = 31.560 MHz
1
crystal = 30.88 MHz
1
crystal = 32.768 MHz
DR3
DR3
DR3
DR3
1
1
1
0
DR2
DR2
DR2
DR2
0
1
0
1
DR1
DR1
DR1
DR1
1
0
0
1
16
5
XTAL
Divide
20
XTAL
Divide
XTAL
Divide
16
XTAL
Divide
Table 10
Table 11
Table 8
Table 9
(MHz)
TCLK
2.048
TCLK
(MHz)
6.312
TCLK
(MHz)
1.544
TCLK
(MHz)
2.048
8
In order to set the device for one T1 channels
operating in High Tolerance Mode (HT) then DR4
= DR2 = 1; DR3 = DR = 0, together with a crystal
of 30.88MHz as shown in the Table 13.
In order to double the available transmission distance
from 25km to 50km, the value of the crystal must be
reduced by half. For a single T1 channel set DR4 =
DR3 = DR2 = DR1 = 0, together with a crystal of
15.44MHz as shown in Table 14.
In order to set the device for four E1 channels then
DR4 = DR1 = 1; DR3 = DR2 = 0, together with a
crystal of 32.768MHz as shown in the Table 15.
In order to set the device for four T1 channels then
DR3 = DR2 = DR1 = 0; DR4 = 1, together with a
crystal of 30.88MHz a shown in the Table 16.
1 * T1 Channel Selection in HT mode
1 * T1 Channel Selection at 50km
4 * E1 Channel Selection
4 * T1 Channel Selection
DR4
DR4
DR4
DR4
0
crystal = 16.384 MHz
1
crystal = 30.88 MHz
0
crystal = 15.44 MHz
1
crystal = 32.768 MHz
DR3
DR3
DR3
DR3
0
0
0
0
DR2
DR2
DR2
DR2
0
1
0
0
DR1
DR1
DR1
DR1
1
0
0
1
8
20
10
16
XTAL
Divide
XTAL
Divide
XTAL
Divide
XTAL
Divide
ACS405CS Issue 4.3 June 1999.
Table 13
Table 15
Table 14
Table 12
(MHz)
2.048
(MHz)
1.544
TCLK
TCLK
TCLK
(MHz)
1.544
TCLK
(MHz)
2.048