BusinessPhone Communication Platform 4.0
Commands > Commands 1000...1999

## 1609
Filter coefficient

The command is used to state the filter coefficient in the analogue interface on the line board.

The initial value for the filter coefficient used depends on the BTU-type.

The impedance is stated as: Rs(ohm) + Rp(ohm) // Cp(nF).

The following initial values are available at present:

Type of BTU: |  | “Standard”: |
BTU-A |  | 107 |
BTU-C |  | - |
BTU-E |  | - |

The following filter coefficients are available at present: Rs + Rp//Cp

Value | Input impedance | Balance impedance
98 | Reserved for test.
99 | Reserved for test.
100 | Reserved for test.
Sweden
101 | 0 + 900//30 | 0 + 900//60
Finland short line
102 | 600 | 390 + 620//100
Finland long line
103 | 270 + 910//120 | 270 + 1200//120
Italy
104 | 600 | 400 + 700//200
Spain
105 | 220 + 775//120 | 220 + 820//120
Austria short BTU-A2
106 | 250 + 833//133 | 250 + 833//133
Standard
107 | 600 | 370 + 620//310
Denmark short
108 | 400 + 500//330 | 270 + 390//91
Denmark long
109 | 400 + 500//330 | 300 + 1000//220
Norway
110 | 120 + 820//110 | 120 + 820//110
Netherlands
111 | 600 | 340 + 422//100
Belgium
112 | 150 + 830//72 | 150 + 830//72
Czech. Rep.
113 | 220 + 820//115 | 220 + 820//115
Austria long BTU-A2
114 | 250 + 833//133 | 220 + 1200//150
Australia
115 | 220 + 820//120 | 220+820//120
4-W tie line BTU-E
116 | 600 | –
Australia DDI BTU-C
117 | 370 + 220//310 | 600
England 1, New Zealand 1
118 | 370 + 620//310 | 370 + 620//310
England 2, New Zealand 2
119 | 370 + 620//310 | 300 + 1000//220
Brazil
120 | 900 | 800//50
BTU-E 4-wire
121 | 600 | –
Denmark 3 (+ 6 dB)
122 | 400 + 500//330 | 300 + 1000//220
China
123 | 200 + 680//100 | 200 + 680//100
Switzerland 12 kHz Filter
124 | 220 + 820//115 | 220 + 820//115
Extrem long line
125 | 220 + 820//115 | 620 + 1660//275
126-255 | Reserved for future use.

Value = 98-255

Minimum required authority level from telephone: No

Accessible via BMS: Yes

Revision: A © Ericsson Enterprise 2003