XRT83SL38ES Exar, XRT83SL38ES Datasheet - Page 40

• Manufacturer Part Number: XRT83SL38ES
• Description: Peripheral Drivers & Components - PCIs 8 CHT1/E1LIUSH
• Manufacturer: Exar

Specifications of XRT83SL38ES

• Product Category: Peripheral Drivers & Components - PCIs
• Rohs: yes

F
XRT83SL38
OCTAL T1/E1/J1 SH TRANSCEIVER WITH CLOCK RECOVERY AND JITTER ATTENUATOR
N+1 redundancy has one backup card for N primary cards. Due to impedance mismatch and signal contention,
external relays are necessary when using this redundancy scheme. The advantage of relays is that they create
complete isolation between the primary cards and the backup card. This allows all transmitters and receivers
on the primary cards to be configured in internal impedance mode, providing one bill of materials for all
interface modes of operation. The transmit and receive sections of the XRT83SL38 are described separately.
TRANSMIT
For N+1 redundancy, the transmitters on all cards should be programmed for internal impedance mode
providing one bill of materials for T1/E1/J1. The transmitters on the backup card do not have to be tri-stated. To
swap the primary card, close the desired relays, and tri-state the transmitters on the failed primary card. A
0.68μF capacitor is used in series with TTIP for blocking DC bias. See
of the transmit section for an N+1 redundancy scheme.
N
IGURE
OTE
Backplane Interface
: For simplification, the over voltage protection circuitry was omitted.
15. S
IMPLIFIED
TxTSEL=1, Internal
Prim ary Card
TxTSEL=1, Internal
Prim ary Card
TxTSEL=1, Internal
Backup Card
T xT SEL=1, Internal
Primary Card
B
LOCK
D
IAGRAM
Tx
Tx
Tx
Tx
XRT83SL38
XRT83SL38
XRT83SL38
XRT83SL38
- T
0.68
0.68
0.68
0.68
RANSMIT
μ
μ
μ
μ
F
F
F
F
S
ECTION FOR
38
Line Interface Card
N+1 R
Figure 15
EDUNDANCY
1:2 or 1:2.45
1:2 or 1:2.45
1:2 or 1:2.45
for a simplified block diagram
T1/E1 Line
T1/E1 Line
T1/E1 Line
REV. 1.0.2