PM4341AT1XC
DATA SHEET
PMC-900602
ISSUE 7
T1 FRAMER/TRANSCEIVER
Figure 11
- External AnalogTransmit Interface Circuit
VDD
470nF ± 10%
TAVD
TC
0 to 655
foot cable
0.68µF ± 10%, 50V
TAP
T
22Ω
±10%
DSX-1
Interface
100 Ω
1nF
±10%
R
TAN
1:1.36
TAVS
optional
"snubbing "
network
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
-Typical Characteristics ofTransmitTransformer
Turns
Ratio
OCL (mH
min.)
Cw/w (pF
max.)
LL (µH
max.)
DCR pri.
(Ω max.)
DCR sec.
(Ω max.)
(PRI:SEC)
1:1.36
1.20
35
0.80
0.80
1.2
Where 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
56
PMC [ PMC-SIERRA, INC ]
