Allied Telesis AR Router Series, Справочник по аппаратуре

Страница: 88 / 111

88 AR Router
C613-03031-01 REV E
Figure 49: Pin wiring diagram for a Macintosh serial cable.
Transceivers and AUI Cables
There are four types of Ethernet transceiver available (Table 37 on page 88). The
10BASE-5 thick Ethernet transceiver will be remote from the router, due to the
nature of the coaxial cable, and will therefore require an AUI cable. The other
types of transceiver may be connected using an AUI cable or, if the transceiver
is small and lightweight, it may be connected directly to the AUI port on the
back of the router. If this is done, care must be taken to avoid strain on the AUI
port connector.
AR routers may also be connected to a network via an AUI fanout. This device
has multiple AUI ports wired as transceiver AUIs and a single standard AUI
for connection of a transceiver. This arrangement allows several Ethernet
devices to share a single transceiver. An AUI cable is required if this method is
used.
Transceivers have a switch or a jumper to enable or disable SQE ( Signal Quality
Error , also known as heartbeat). AR routers do not require SQE, so it should be
disabled.
AUI cables (sometimes known as drop or transceiver cables) are available from
data cabling suppliers in a variety of lengths up to a maximum of 40 metres,
but are typically between one and five metres in length. AUI cables always
have one female and one male DB15 connector and are fitted with slide lock
retaining clips to ensure a secure attachment.
Table 37: Ethernet transceivers, media, and connector types.
Type Media Connector
10BASE-2 Thin Ethernet coaxial cable BNC
10BASE-T Twisted pair (category 3 or better) RJ-45
10BASE-F Fibre optic (dual) ST or SMA
10BASE-5 Thick Ethernet coaxial cable Vampire TAP or “N” type
RJ45
(to switch or router)
MiniDin
(to Macintosh)
1
2
3
4
5
6
7
8
←
→
←
→
←
→
(RING)
(DCD)
(RTS)
(RXD)
(GND)
(TXD)
(CTS)
(DTR)
Not connected
Notes:
(1)
→
Output from switch or router;
←
Input to switch or router.
(2) Cable version 1.0.
MINIDIN
1
2
8
5
4
6
7
3