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參數(shù)資料
| 型號(hào)： | PBL38665-2 |
| 廠商： | ERICSSON |
| 英文描述： | Subscriber Line Interface Circuit |
| 中文描述： | 用戶線接口電路 |
| 文件頁(yè)數(shù)： | 7/18頁(yè) |
| 文件大小： | 184K |
| 代理商： | PBL38665-2 |
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PBL 386 65/2
7
Preliminary
Notes
1.
The overload level is automatically expanded when the
signal level > 3.1 V
and is specified at the two-wire port
with the signal source at the four-wire receive port.
The two-wire impedance is programmable by selection of
external component values according to:
Z
TR
= Z
T
/|G
2-4S
α
RSN
| where:
Z
TR
= impedance between the TIPX and RINGX
terminals
Z
T
= programming network between the V
TX
and RSN
terminals
G
2-4S
= transmit gain, nominally = 0.5
α
RSN
= receive current gain, nominally = 400 (current
defined as positive flowing into the receivesumm-
ing node, RSN, and when flowing from tip to ring).
Higher return loss values can be achieved by adding a
reactive component to R
, the two-wire terminating
impedance programming resistance, e.g. by dividing R
into two equal halves and connecting a capacitor from the
common point to ground.
2.
3.
4.
The overload level is automatically expanded, as needed
up to 3.1 V
when the signal level >1.55 V
and is
specified at the four-wire transmit port, VTX, with the signal
source at the two-wire port. Note that the gain from the
two-wire port to the four-wire transmit port is G
= 0.5.
Secondary protection resistors R
impact the insertion loss
as explained in the text, section Transmission. The
specified insertion loss is for R
= 0.
The specified insertion loss tolerance does not include
errors caused by external components.
The level is specified at the four-wire receive port and
referenced to a 600
programmed two-wire impedance
level.
The two-wire idle noise is specified with the four-wire
receive port grounded (E
= 0; see figure 6).
The four-wire idle noise at VTX is the two-wire value -6 dB
and is specified with the two-wire port terminated in 600
(R
). The noise specification is referenced to a 600
programmed two-wire impedance level at V
TX
. The four-wire
receive port is grounded (E
RX
= 0).
5.
6.
7.
8.
PBL 386 65/2
TIPX
RINGX
S
-48V
R
LRTO
R
Figure 7. Tipx voltage.
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