3Com SuperStack II User Manual

42 CHAPTER 4: CONNECTORS AND CABLES
WAN Connector
and Cables
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.
ISDN S/T Cable 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
* 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.
RJ-45 male (shielded)
To WAN port To wall outlet or NT1
12345 786
RJ-45 male (shielded)
12345 786
Name Abbr. Pin Pin Abbr. Name
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
NC
NC
TxD+
RxD+
RxD-
TxD-
NC
NC
NC
NC
TxD+
RxD+
RxD-
TxD-
NC
NC
Not connected
Not connected
Transmit Data+
Receive Data+
Receive Data-
Transmit Data-
Not connected
Not connected
Not connected
Not connected
Transmit Data+
Receive Data+
Receive Data-
Transmit Data-
Not connected
Not connected
HWBook Page 42 Friday, June 19, 1998 3:42 PM

3Com SuperStack II Specifications

General

Brand	3Com
Model	SuperStack II
Category	Switch
Language	English