PM4314 QDSX
DATA SHEET
PMC-950857
ISSUE 5
QUAD T1/E1 LINE INTERFACE DEVICE
Figure 16
- External AnalogTransmit Interface Circuit
VDD
C 2
TAVD
0 to 655
foot cable
for DSX-1
TC
TXTIP
C 3
T
R 1
DSX-1/E1
Interface
R 3
C 1
R
TXRING
TAVS
R 2
1:1.36
R3
optio nal
"snub bing
network
"
Form at
R1
R2
C1
C2
C3
1nF±10%
470nF±10%
0.68µF±10% ,50V
DSX-1Zo=100
E1 Zo=120
E1 Zo=75
Ω
22
Ω
±10%
0
Ω
100
Ω
1nF±10%
1nF±10%
470nF±10%
470nF±10%
0.68µF±20% ,50V
0.68µF±20% ,50V
Ω
47
47
Ω
±10%
±10%
2.7
6.2
Ω
±5% ,1/8W
±5% ,1/8W
120
75
Ω
Ω
Ω
Ω
Ω
The transformer used should be designed for use in T1/CEPT/ISDN-PRI
applications. Many manufacturers have standard products for these applications.
Typical characteristics of a suitable transformer are given in the following table.
Table 3
-
Turns
OCL
Cw/w
LL
DCR pri.
DCR sec.
Ratio
(mH min.)
( max.)
Ω
( max.)
Ω
(pF max.)
(µH max.)
(PRI:SEC)
1:1.36
where
1.20
35
0.80
0.80
1.2
OCL is the open-circuit inductance,
Cw/w is the inter-winding capacitance,
LL
is the leakage inductance, and
DCR is the DC resistance.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
49
PMC [ PMC-SIERRA, INC ]
