Lucent Technologies Inc.
13
Data Sheet
October 1998
Relay, and Protector (SRP) for Long Loop and TR-57 Applications
L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring
Electrical Characteristics
(continued)
Transmission Characteristics
Transmit direction is Tip/Ring to XMT. Receive direction is IRCV/RCVN to Tip/Ring.
Table 8. ac Transmission Characteristics
1. Requires external components connected as shown in Figure 5. Transmission characteristics are specified assuming a 900
resistive ter-
mination and
±
1% external resistors.
2. Transmission characteristics are specified assuming a 900
resistive termination; however, feedback using external components allows the
user to adjust the termination impedance from 900
to most ITU-T recommended complex termination impedances.
3. This parameter is not tested in production. It is guaranteed by design and device characterization.
Parameter
1
Min
—
Typ
600
Max
—
Unit
ac Termination Impedance
2
Return Loss
3
:
200 Hz—500 Hz
500 Hz—2500 Hz
2500 Hz—3400 Hz
Tip/Ring Signal Level (600
reference)
Total Harmonic Distortion (200 Hz—4 kHz)
3
Transmit Gain (f = 1 kHz):
(Tip/Ring) to XMT
Receive Gain (f = 1 kHz):
IRCV to Differential Current Flowing from IPT to IPR
RCVN to IRCV
Gain vs. Frequency (transmit and receive; 1 kHz reference)
3
:
200 Hz—300 Hz
300 Hz—3.4 kHz
3.4 kHz—20 kHz
20 kHz—266 kHz
Gain vs. Level (transmit and receive; 0 dBV reference)
3
:
–50 dB to +3 dB
Transhybrid Loss
3
:
200 Hz—500 Hz
500 Hz—2500 Hz
2500 Hz—3400 Hz
Idle-channel Noise (Tip/Ring):
Psophometric
3
C-message
3 kHz Flat
3
Idle-channel Noise (XMT):
Psophometric
3
C-message
3 kHz Flat
3
21
26
21
—
—
—
—
—
—
—
—
—
—
3.14
0.3
dB
dB
dB
dBm
%
–0.486
–0.500
–0.514
—
195
0.995
200
1
205
1.005
—
—
–1.00
–0.30
–3.0
—
0
0
0
—
0.05
0.05
1.0
1.0
dB
dB
dB
dB
–0.05
0
0.05
dB
21
26
21
—
—
—
—
—
—
dB
dB
dB
—
—
—
—
—
—
–77
12
20
dBmp
dBrnC
dBrn
—
—
—
—
—
—
–77
12
20
dBmp0
dBrnC0
dBrn0