62
2-WIRE IDSL LINE DRIVER RACK CARDS
E.5.2 C
ONNECTING THE
10BASE-T E
THERNET
P
ORT TO A
PC (DTE)
The rear card interface is configured as DTE (Data Terminal Equipment). If you
want to connect the rear card to another DTE device such as a 10BASE-T network
interface card in a PC, you must construct a 10BASE-T crossover cable as shown in
Figure E-6.
Rear Card
10BASE-T DTE
RJ-45 Pin No.
RJ-45 Pin No.
1 (TD+)
1 (TD+)
2 (TD-)
2 (TD-)
3 (RD+)
3 (RD+)
6 (RD-)
6 (RD-)
Figure E-6. Crossover cabling.
E.5.3 C
ONNECTING THE
L
INE
I
NTERFACE
The 10BASE-T Ethernet rear card must be used with a front function card. There
are two essential requirements for connecting the line interface on the rear card.
1. These units work in pairs with one rear card connected to another rear card
over 2- or 4-wire twisted pair (2- or 4-wire operation is determined by the front
function card).
2. To function properly, the rear card needs one or two twisted pairs of metallic
wire (2- or 4-wire). The twisted pairs must be unconditioned, dry, metallic
wire, between 19 (0.9 mm) and 26 AWG (0.4 mm). Standard dialup
telephone circuits that run through signal-equalization equipment, or
standard, flat modular telephone-type cable are
not
acceptable. See
Figure E-7.
