Product Overview
Ethernet bridge adapters
100BASE-T, E66210.32
10/100BASE-T, E66210.33
DN0610789
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Contents
Contents
1
Product description ...............................................................................4
2
2.1
2.2
Hardware installation instructions .......................................................7
Front panel...............................................................................................9
Cabling...................................................................................................11
3
Product features...................................................................................12
Bridge.....................................................................................................12
LAN ........................................................................................................12
WAN.......................................................................................................13
Environmental ........................................................................................13
Modem requirements .............................................................................13
3.1
3.2
3.3
3.4
3.5
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Product Overview
1
Product description
The Nokia ET-adapter is a plug-and-play Ethernet interface adapter for Dynanet
(DNT) modems. This Ethernet interface adapter can be installed to the adapter
port of a DNT modem.
Figure 1.
ET adapter
The main function of the ET-adapter is to bridge two LANs over the WAN.
Ethernet frames received from the LAN are encapsulated inside the HDLC
frames and the HDLC frames are sent to the WAN according the serial data
speed of WAN. The WAN interface of ET-adapter is connected to the interface
port of DNT-series modem. Packets that are received from WAN are
decapsulated from HDLC frame and then sent to Ethernet interface of an ET-
adapter.
WAN transmission rate and used time slots are selected from the modem end.
The modem can indicate adapter type and Ethernet link status. All other settings
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DN0610789
Product description
are fixed. There are three selectable Ethernet interface settings in E66210.33:
10BASE half and full duplex and 100BASE full duplex.
The data path and main components of ET-adapter are described in the block
diagram below.
ET-Adapter 100 BASE-T
Power
3,3V / 1,8V
ISEPROM
2048x8
HDLC
MII
10/100
Bridge
DS33ZII
PHY
LXT971
WAN Euro
RJ-45
LAN
Link integrity & activity
LEDs
SDRMA
4x1Mx32
Figure 2.
Block diagram
ET-adapter is compatible to virtual LANs and 802.1Q VLAN tags are
forwarded transparently over the WAN. Using virtual LANs several subnets can
be combinated to the one Ethernet link, but only if also Ethernet switches
support VLANs.
100BASE-T
100BASE-T
Ethernet
switch
Ethernet
switch
VLAN1
VLAN2
VLAN1
VLAN2
VLAN
Figure 3.
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Product Overview
Ethernet bridge adapter makes rate adaption and it can be connected to
10BASE-T ET-adapter or DYNANET EIU.
100BASE-T
10BASE-T
10BASE-T
Figure 4.
E66210.32 connected
7 OCTETS
PREAMBLE
SFD
1 OCTET
6 OCTETS
6 OCTETS
2 OCTETS
DESTINATION ADDRESS
SOURCE ADDRESS
LENGTH/TYPE
MAC CLIENT DATA
PAD
Octets within
frame transmitted
top to bottom
46-1500 OCTETS
4 OCTETS FRAME CHECK SEQUENCE
All octets except preamble
and SFD are bridged
LSB
MSB
transparently over the WAN
0
7
b
b
Bits within
frame transmitted left to right
Figure 5.
MAC frame
The figure above describes the standard Ethernet frame without VLAN tag.
Standard maximum frame length is 1518 bytes. The ET-adapter supports frames
included in 802.1Q VLAN tag. 1522 bytes long frames are forwarded from
LAN to WAN.
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DN0610789
Hardware installation instructions
2
Hardware installation instructions
Modern
connector
Ethernet
connector
NR3
Pin 1
Figure 6.
ET Adapter card E66210.33
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Product Overview
Table 1. E66210.33 bridging
Link speed
10BASE
Half
1-2
10BASE
Full
100BASE
Full
Duplex status
Closed pins
LED 100
3-4
5-6
Off
Off
On
LED HD
On
Off
Off
Installing E66210.32
Figure 7.
Installing the adapter
1.
Switch off the modem power, plug the ET-adapter into the slot and
tighten two screws. Then switch on the modem. The ET-adapter is ready
to use.
Installing E66210.33
1.
2.
Select Ethernet interface configuration and close pins of NR3 according
to Table 1.
Switch off the modem power, plug the ET-adapter into the slot and
tighten two screws. Then switch on the modem. The ET-adapter is ready
to use.
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Hardware installation instructions
2.1
Front panel
100 BASE-T Bridge
RX
LINK
Figure 8.
Front panel
RX displays receive status: LED blinks every time when an Ethernet packet is
received from the LAN.
LINK displays link status: LED is lit when cable is connected to another
Ethernet equipment and the link is up. Link status is also shown at the DNT
modem: if the link is down there is no incoming signal alarm.
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Product Overview
Speed
10
100
100
100 HD
Duplex
Half
Full
10/100 BASE-T Bridge
Off On
Off Off
On Off
Full
RX
LINK
100
HD
Figure 9.
Front panel E66210.33
RX displays receive status. LED blinks every time when an Ethernet packet is
received from the LAN.
LINK displays link status. LED is lit when cable is connected to another
Ethernet equipment and the link is up. Link status is also shown at the DNT
modem: if the link is down there is no incoming signal alarm.
100 displays speed status. LED is lit when the ET-adapter is configured to
100BASE mode, otherwise the adapter is configured to 10BASE mode.
HD displays duplex status. LED is lit when the ET-adapter is configured to
half duplex mode, otherwise the adapter is configured to full duplex mode.
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Hardware installation instructions
Pin
1
Signal
Direction
input
Rx+
2
Rx-
input
3
Tx+
output
4
Not connected
Not connected
Tx-
5
6
output
7
Not connected
Not connected
8
Figure 10.
Ethernet connector and pin numbering
2.2
Cabling
ET-adapter is connected to the network adapter with a direct Ethernet cable.
The maximum length of a category 5 cable is 100m. If the ET-adapter is
connected to the Ethernet hub or switch then use a cross-connected Ethernet
cable.
Figure 11.
Direct cabling
Ensure that the Ethernet port that is connected to ET-adapter has the same
configuration as the ET-adapter. Port speed and duplex status have to be the
same at both Ethernet ports. It is not recommended to use auto-negotiation
option. Port configuration should always be fixed.
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Product Overview
3
Product features
3.1
Bridge
All received frames are forwared transparently to the WAN.
Receive buffer size
Transmit buffer size
1728 MAC frames
320 MAC frames
Receive buffer is queue for data that was received from the Ethernet (LAN) to
be transmitted to the HDLC (WAN).
Transmit buffer is for data that was received from the WAN to be transmitted
to the Ethernet.
Receive buffer high watermark
Receive buffer low watermark
1632 MAC frames
1536 MAC frames
If the receive buffer size exceeds higher watermark, the ET adapter will send a
pause frame to LAN. Pause frame is sent every time when a frame is received
from LAN until the low watermak is reached. The pause frame is sent to a
multicast destination address 01-80-C2-00-00-01. Pause time parameter of
pause frame is 80 slots. Pause frame is sent only when full duplex mode is
selected.
3.2
LAN
Selectable configuration
10 Mbps and half duplex
10 Mbps and full duplex
100 Mbps and full duplex
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Product features
Maximum transfer unit
2016 bytes
Any frame larger than the maximum transfer unit (MTU) value will be rejected.
The frame size includes destination address, source address, type, length, data
and CRC. Standard Ethernet frame maximum length is 1518 bytes (destination
address 6 bytes + source address 6 bytes + type 2 bytes + data 1500 bytes +
CRC 4 bytes).
Cable
UTP CAT5, maximum cable length
100m
3.3
WAN
HDLC
RFC1662
FCS
16 bits
Idle signal flag
7E (0111 1110)
Idle flags are sent continously to WAN when there are no packets in the receive
buffer. Two idle flags are sent between every HDLC packet.
Line speed
n x 64 kbps (n = 1…32)
3.4
Environmental
Climatic
Operation:
Transport:
Storage:
EN 300 019, class 3.2
EN 300 019, class 2.3
EN 300 019, class 1.2
EN 300 386
EMC:
Power consumption:
800 mW
3.5
Modem requirements
The ET-adapter can be installed to the follwing modems. The modem adapter
type is displayed as V.35 or Ethernet E66210.32 depending on the DNT modem
software version.
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Product Overview
DNT2M-sp
T65620
T65630
T65670
T65680
T65650
T65660
DNT2M-mp
DNT2Mi-sp
DNT2Mi-mp
DNT2M-G-sp
DNT2M-G-mp
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DN0610789
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