92
A
PPENDIX
A: C
ABLE
S
PECIFICATIONS
The baud rate should not exceed 64 Kbps when the V.24 cable operates in
synchronous mode.
DTE and DCE Mode
The synchronous serial interface can operate in both DTE mode and DCE mode.
For two devices connected directly, one device should operate in DTE mode, and
the other device should operate in DCE mode. The DCE mode device provides a
synchronous clock and specifies the transmission rate, the DTE mode device
accepts the synchronous clock and communicates at the specified transmission
rate. Usually, the router serves as the DTE device. To determine whether the device
is a DTE or a DCE, refer to the user manual for the device.
In general, the asynchronous serial interface is connected to a modem or a
terminal adapter (TA) to act as the dial-up interface. In this case, it is unnecessary
to determine whether the device is DTE or DCE, you must only select the
appropriate baud rate.
The synchronous/asynchronous serial port cable is connected to a DB-50
receptacle. Proper connection cable needs to be selected for the protocol applied.
Four types of synchronous/asynchronous serial port cables are available. However,
these cables are optional and you must select the proper one based on your
requirements when you purchase the router All these types of cables have a DB-50
adapter at one end.
At the network end, the connector is different for each type of cable, as described
in the following list:
■
V.24 (EIA/TIA-232) DTE cable — DB-25 (male) adapter
■
V.24 (EIA/TIA-232) DCE cable — DB-25 (female) adapter
4800
60
4800
625
9600
30
9600
312
19200
30
19200
156
38400
20
38400
78
64000
20
54000
60
115200
10
64000
50
-
-
2048000
30
Table 59
Typical DTE and DCE
Type of Equipment
Type of Interface
Typical Equipment
DTE
male
PC or router
DCE
female
Modem, multiplexer or
CSU/DSU
Table 58
Transmission Rate and Transmission Distance of V.24 (EIA/TIA-232)/V.35 Cable
V.24 (EIA/TIA-232)
V.35
Baud rate (bps)
Maximum
transmission
distance (m)
Baud rate (bps)
Maximum
Transmission
distance (m)
Содержание 3C13701
Страница 14: ...12 CHAPTER 1 INTRODUCING THE ROUTER 5000 FAMILY ...
Страница 34: ...32 CHAPTER 2 INTRODUCING ROUTER 5012 SICS ...
Страница 57: ...ADSL MIMM 55 ...
Страница 58: ...56 CHAPTER 3 INTRODUCING ROUTER 5000 FAMILY MIMS ...
Страница 68: ...66 CHAPTER 4 INSTALLING THE ROUTER ...
Страница 90: ...88 CHAPTER 7 TROUBLESHOOTING ...
Страница 100: ...98 APPENDIX A CABLE SPECIFICATIONS ...
Страница 104: ...102 APPENDIX A OBTAINING SUPPORT FOR YOUR PRODUCT ...