System information

FCD 901 48
Issue R2A, 07.2009
XMP1 Release 5.5 System Description
Clock interfaces
Page 9-36 Proprietary Information Aastra
Grounding Plus- or minus pole, preferably plus pole
External automatic circuit breaker
At each ungrounded pole of the power supply,
the XMP1-SL supply voltage must be protected
by an external automatic circuit breaker of up to
6 A T (slow-blow).
9.15.5 Clock interfaces
Connector type
9-pin SubD, male
9.15.5.1 2048 kHz, T3
Frequency 2048 kHz
Signal shape acc. ITU-T G.703
Impedance
highly resistive (>1,6 kOhm), 75 Ohms or
120 Ohms
9.15.5.2 2048 kHz, T4
Frequency 2048 kHz
Signal shape acc. ITU-T G.703
Impedance
highly resistive (>1,6 kOhm), 75 Ohms or
120 Ohms
9.15.6 Alarm interface
Alarm contacts for A-alarms and B-alarms
Maximum switching voltage (SELV circuit) -60 V
Maximum current 1 A
9.15.7 E1 interfaces (Inhouse)
Number of interfaces 8
Connector type 37-pin SubD, male
Interface characteristics acc. ITU-T G.703
Impedance
120 Ohms resistive (bal.), 75 Ohms coaxial
(unbal.) or highly resistive < 1.6 kOhms
Bit rate (2048
5 x 10
-5
) kbit/s
Period duration T0 488 ns
Signal code HDB3
Transmit signal shape at F1out approx. rectangle
Transmit signal amplitude at F1out (line) US
0
3 V 10% across 120 Ohm or
2,37 V
10% across 75 Ohm
Permissible attenuation of the receive sigal with
a center frequency of 1 MHz, referred to the
amplitude of the transmit signal at F1out (line)
max. 6 dB
Table 9.O: XMP1-SL