Wan Connector And Cables; Isdn S/T Cable - 3Com SuperStack II User Manual

42 C 4: C
HAPTER ONNECTORS AND
* A high-delay repeater as specified in IEEE 802.3 standards. A Class 1 repeater usually connects dissimilar media, for instance, UTP to
fiber.
† A low-delay repeater as specified in IEEE 802.3 standards. A Class 2 repeater usually connects similar media, for instance, UTP to UTP.
‡ This scenario is unlikely, because Class 2 repeaters do not usually connect FX to T4.
WAN Connector
and Cables

ISDN S/T Cable

C
ABLES
The WAN connector can be an ISDN S/T (model 43x and 53x), ISDN U
(model 44x and 54x), 56/64 Kbps CSU/DSU (model 45x and 55x), or
T1/FT1 CSU/DSU (model 46x and 56x) connector, depending on the
interface module installed.
To connect a model 43x or model 53x bridge/router to an ISDN network,
use a Category 5 shielded twisted-pair cable with an RJ-45 connector on
both ends. 3Com does not supply this cable.
Figure 14 shows the pin assignments of the ISDN S/T cable.
Figure 14 ISDN S/T Cable
To WAN port
1 2 3 4 5 7 8
RJ-45 male (shielded)
Name Abbr. Pin
Not connected
Not connected
Transmit Data+
Receive Data+
Receive Data-
Transmit Data-
Not connected
Not connected
6
NC 1
NC 2
TxD+ 3
RxD+ 4
RxD- 5
TxD- 6
NC 7
NC 8
To wall outlet or NT1
1 2 3 4 5 7 8 6
RJ-45 male (shielded)
Pin Abbr. Name
NC
1 Not connected
2 NC
Not connected
TxD+
3 Transmit Data+
4 RxD+
Receive Data+
RxD-
5 Receive Data-
6 TxD-
Transmit Data-
NC
7 Not connected
8 NC
Not connected