HYC9088A_07 Datasheet, PDF (6/11 Pages) SMSC Corporation – ARCNET Twisted Pair and Coaxial Compatible High Impedance Transceiver HIT

Proper Connection for Twisted Pair
Each twisted pair compatible ARCNET node would typically have two RJ-11 modular connectors mounted on the
node card (refer to Figure 4). PHASE A should be connected to pin 2 of the connectors and PHASE B to pin 3. A
twisted pair segment would have an RJ-11 modular jack on each end (see Figure 5). Please note that the suggested
numbering scheme of the modular jack shown in Figure 5 may not be consistent with that found on some manufacturers'
products. Please ensure consistent connection of Phase A and Phase B signals throughout the network to avoid the
reception of erroneous data.
PARAMETER
Wiring
Number of Twists/Foot
DC Resistance
Characteristic Impedance
Maximum Attenuation
Table 1 - Specifications for Cabling
VALUE FOR COAX
VALUE FOR TWISTED PAIR
RG62
Solid Copper 22, 24, or 26 AWG
N/A
2 min.
3.4 Ohms/1000 ft.
28.6 Ohms/1000 ft. max.
93 Ohms at 1 MHz
105 Ohms  20% at 1 MHz
5.5 dB/1000 ft. at 5 MHz
16.0 dB/1000 ft. at 5 MHz
DISABLE
19
nPULSE 1 ²⁰
nPULSE 2 ¹⁸
FILTER,
AMPLIFIER
AND
DIFFERENTIAL
DRIVER
ISOLATION
TRANSFORMER
1
NC
2
NC
5
NC
9
NC
12 PH-A/CENTER
Rx
DATA
7
VOLTAGE
THRESHOLD
DETECTOR
FILTER
643
13 14 17
11 PH-B/SHIELD
8 _TPA
16 _TPB
15 _TPC
10
TPD
+5V GND -5V GND GND GND
FIGURE 1 – HYC9088A INTERNAL BLOCK DIAGRAM
Revision (02-16-07)
Page 6
DATASHEET
SMSC HYC9088A