INSTALLATION & SET-UP
10
3 . 1. 2 Timing
TIMING
determines the source for the LINE E1 transmit clock, and is set by bit-switch no1.
The options are
ON
or
OFF.
With the switch set to
ON
, the E1 transmit clock is derived from the WC1000's own
internal oscillator.
With the switch set to
OFF
, the E1 transmit clock is derived from the LINE E1 receive
clock.
3 . 1. 3 E1 Port select RJ45/BNC
This single switch is used to select which type of connector (RJ45 or BNC) is to be used to
connect the E1 line.
With the switch set to
ON
, the BNC ports are selected to give G.703 75 ohm unbalanced
interface.
With the switch set to
OFF
, the RJ45 port is selected to give G.703 120 ohm balanced
interface.
3 . 1. 4 Loopback test
This switch is used to initiate loop testing. It is fully described in the next section.
The switch is set to
ON
for normal operation of the unit without any loopbacks.
With the switch set to
OFF
, Loopback is applied, so that Transmit data = Received data on
the E1 port.
3 . 1. 5 LAN mode
Bit-switch
ON:
100 Mbps Full Duplex operation.
Note that this option enables 100M full duplex connection to be implemented. Auto-negotiate
does not distinguish between full versus half duplex modes when negotiating with a fixed
(i.e. non-negotiating) 100Mbps port.
Bit-switch
OFF:
Auto-negotiate Mode (default).
3 . 1. 6 Auto MDI/MID-X
With switch set to
ON
, the LAN ports are fixed as MDI-X for direct connection to a PC. This
may be necessary for reliability when connecting some older non-auto hubs
With switch set to
OFF
, the LAN ports automatically sense the interface and switch between
MDI and MDI-X connections.
3 . 1. 7 E1 Line port
No configuration of the E1 Line port is required. Operation is unframed. The Line Coding
setting is built into the unit (no bit-switch) and cannot be altered. It is HDB3 (High-Density
Binary 3). The maximum line rate is 2.048Mbps. The maximum corresponding packet rate
is 4064 packets per second.
3 . 1. 8 MAC FCS
On older units, bit-switch 7 enabled the transmission of the MAC FCS. This feature has now
been disabled and the WC1000 always strips the MAC FCS from the ethernet packet.
