USER
MANUAL
MODEL 2701/I
G.703/G.704 NTU with
10Base-T Ethernet
Interface
Important—This is a Class A device and is
intended for use in a light industrial environ-
ment. It is not intended nor approved for use
in an industrial or residential environment.
Part# 07M2701I-UM
Doc# 08609U2-001
Rev. I
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
Revised 2/18/08
An ISO-9001Certified
Company
A
Specifications ........................................................................... 26
A.1 Network Data Rate ...................................................................... 26
A.2 Network Connector ..................................................................... 26
A.3 Nominal Impedance ................................................................... 26
A.4 Line Coding ................................................................................ 26
A.5 Line Framing ............................................................................... 26
A.6 CRC-4 Multiframing .................................................................... 26
A.7 Clocking ...................................................................................... 26
A.8 Time Slot Rate ............................................................................. 26
A.9 Network Data Rates .................................................................... 26
A.10 Distance ...................................................................................... 26
A.11 Power Supply .............................................................................. 26
A.12 Humidity ...................................................................................... 27
A.13 Temperature ............................................................................... 27
A.14 Dimensions ................................................................................. 27
B
Ethernet 10Base-T Specifications........................................... 28
B.1 DTE Interface .............................................................................. 28
B.2 DTE Data Rates .......................................................................... 28
B.3 LAn Connection .......................................................................... 28
B.4 Protocol ....................................................................................... 28
B.5 MAC Address Table Size ............................................................ 28
B.6 MAC Address Aging ................................................................... 28
B.7 Frame Buffer ............................................................................... 28
B.8 Frame Latency ............................................................................ 28
B.9 Diagnostics ................................................................................. 28
B.10 Indicators .................................................................................... 28
B.11 Configuration .............................................................................. 28
C
Factory Replacement Parts and Accessories........................ 29
3
1.0 WARRANTY & COMPLIANCE INFORMATION
Patton Electronics warrants all Model 2701/I components to be free from
defects, and will—at our option—repair or replace the product should it
fail within one year from the first date of shipment.
This warranty is limited to defects in workmanship or materials, and does
not cover customer damage, abuse, or unauthorized modification. If this
product fails or does not perform as warranted, your sole recourse shall
be repair or replacement as described above. Under no condition shall
Patton Electronics be liable for any damages incurred by the use of this
product. These damages include, but are not limited to, the following:
lost profits, lost savings and incidental or consequential damages arising
from the use of or inability to use this product. Patton Electronics specif-
ically disclaims all other warranties, expressed or implied, and the instal-
lation or use of this product shall be deemed an acceptance of these
terms by the user.
1.1 COMPLIANCE
EMC Compliance
• EN55022, Class A
• EN55024
Safety Compliance:
• EN 60950-1
• AS/NZS 60950-1
PSTN Regulatory Compliance:
• TBR 12 & 13
• AS/ACIF S016:2001
4
1.2 CE NOTICE
We certify that the apparatus identified in this document conforms to the
requirements of Council Directive 1999/5/EC on the approximation of the
laws of the member states relating to Radio and Telecommunication Ter-
minal Equipment and the mutual recognition of their conformity.
The safety advice in the documentation accompanying this product shall
be obeyed. The conformity to the above directive is indicated by the CE
sign on the device.
1.3 AUTHORIZED EUROPEAN REPRESENTATIVE
D R M Green
European Compliance Services Limited.
Oakdene House, Oak Road
Watchfield, Swindon, Wilts SN6 8TD, UK
1.4 SERVICE
All warranty and nonwarranty repairs must be returned freight prepaid
and insured to Patton Electronics. All returns must have a Return Mate-
rials Authorization number on the outside of the shipping container. This
number may be obtained from Patton Electronics Technical Services at:
• Tel: +1 (301) 975-1007
Note Packages received without an RMA number will not be
accepted.
Patton Electronics' technical staff is also available to answer any ques-
tions that might arise concerning the installation or use of your Patton
Model 2701/I. Technical Service hours: 8AM to 5PM EST, Monday
through Friday.
5
1.5 SAFETY WHEN WORKING WITH ELECTRICITY
• This device contains no user serviceable parts. The
equipment shall be returned to Patton Electronics for
repairs, or repaired by qualified service personnel.
• The external power adapter shall be a listed Limited
Power Source. Ensure that the power cable used meets
all applicable standards for the country in which it is to
be installed, and that it is connected to a wall outlet
which has earth ground. The mains outlet that is uti-
lized to power the devise shall be within 10 feet (3
meters) of the device, shall be easily accessible, and
protected by a circuit breaker.
WARNING
• Hazardous network voltages are present in WAN ports
regardless of whether power to the unit is ON or OFF. To
avoid electric shock, use caution when near WAN ports.
When detaching the cables, detach the end away from
the device first.
• Do not work on the system or connect or disconnect
cables during periods of lightning activity.
In accordance with the requirements of council direc-
tive 2002/96/EC on Waste of Electrical and Electronic
Equipment (WEEE), ensure that at end-of-life you sepa-
rate this product from other waste and scrap and deliver
to the WEEE collection system in your country for recy-
cling.
This device is not intended to be connected to the public
telephone network.
WARNING
6
2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product. This
product has been thoroughly inspected and tested and is warranted for
One Year parts and labor. If any questions or problems arise during
installation or use of this product, please do not hesitate to contact Pat-
ton Electronics Technical Support at (301) 975-1007.
2.1 FEATURES
• Terminates G.703 and G.704, E1/fractional E1 service
• Available in low-cost standalone or rack-mountable versions
• n x 64 kbps data rates to 2.048 Mbps
• 10Base-T Ethernet bridge
• PPP (Point to Point Protocol, RFC 1661) with Bridge Control Protocol
(RFC 1638)
• 75-ohm dual coax and 120-ohm twisted-pair G.703 connections
• Local and remote loopback diagnostics
• Internal and G.703 network timing
• CE approval
• 90-260VAC & 48VDC power options
• Conforms to ONP requirements CTR 12 and CTR 13 for connection to
international Telecom networks
2.2 DESCRIPTION
The Model 2701/I receives channelized G.704 (n x 64kbps) or clear
channel E1/G.703 (2.048-Mbps) data from the telco's digital data net-
work. The Model 2701/I terminates the G.703 telco interface and con-
verts the data for transmission to a user-oriented 10Base-T (802.3)
Ethernet interface.
The Ethernet (Model 2701/I) supports an integrated 10Base-T (802.3)
Ethernet port with transparent bridging capability for IP, IPX, DECnet,
NetBIOS and other layer-3 protocols. The 2701/I attaches to the LAN
and intelligently bridges data traffic to the large central site router
through the telco's leased line network. The 2701/I supports PPP (RFC
1661) and BCP (RFC 1638).
7
The Model 2701/I is a 10Base-T bridge that operates over G.703/G.704
lines. It uses MAC learning and forwarding to provide seamless LAN-to-
LAN connectivity. As a result, corporate enterprises can connect their
servers to a pair of NTUs and automatically forward data packets that are
meant for the remote network. Local packets are filtered and passed only
to the local LAN.
8
3.0 PPP OPERATIONAL BACKGROUND
PPP is a protocol used for multi-plexed transport over a point-to-point
link. PPP operates on all full duplex media, and is a symmetric peer-to-
peer protocol, which can be broken into three main components: 1. A
standard method to encapsulate datagrams over serial links; 2. A Link
Control Protocol (LCP) to establish, configure, and test the data-link con-
nection; 3. A family of Network Control Protocols (NCPs) to establish and
configure different network layer protocols.
In order to establish communications over a point-to-point link, each end
of the PPP link must first announce its capabilities and agree on the
parameters of the link’s operation. This exchange is facilitated through
LCP Configure-Request packets.
Once the link has been established and optional facilities have been
negotiated, PPP will attempt to establish a network protocol. PPP will
use Network Control Protocol (NCP) to choose and configure one or
more network layer protocols. Once each of the network layer protocols
have been configured, datagrams from the established network layer
protocol can be sent over the link. The link will remain configured for
these communications until explicit LCP or NCP packets close the link
down, or until some external event occurs.
The PPP Bridging Control Protocol (BCP), defined in RFC 1638, config-
ures and enables/disables the bridge protocol on both ends of the point-
to-point link. BCP uses the same packet exchange mechanism as the
Link Control Protocol (LCP). BCP is a Network Control Protocol of PPP,
bridge packets may not be exchanged until PPP has reached the net-
work layer protocol phase.
3.1 APPLICATIONS
In situations where a routed network requires connectivity to a remote
Ethernet network, the interface on a router can be configured as a PPP
IP Half Bridge. The serial line to the remote bridge functions as a Virtual
Ethernet interface, effectively extending the routers serial port connec-
tion to the remote network. The bridge device sends bridge packets
(BPDU's) to the router's serial interface. The router will receive the layer
three address information and will forward these packets based on its IP
address.
Figure 1 shows a typical Cisco router with a serial interface configured
as a PPP Half Bridge. The router serial interface uses a remote device
that supports PPP bridging to function as a node on the remote Ethernet
network. The serial interface on the Cisco will have an IP address on the
same Ethernet subnet as the bridge.
9
Figure 1. Cisco router with serial interface, configured as PPP Half Bridge.
For example, the customer site is assigned the addresses 192.168.1.0/
24 through 192.168.1.1/24. The address 192.168.1.1/24 is also the
default gateway for the remote network. The above settings remove any
routing/forwarding intelligence from the CPE. The associated Cisco con-
figuration will set serial interface (s0) to accommodate half bridging for
the above example.
Authentication is optional under PPP. In a point-to-point leased-line link,
incoming customer facilities are usually fixed in nature, therefore authen-
tication is generally not required. If the foreign device requires authenti-
cation via PAP or CHAP, the PPP software will respond with default Peer-
ID consisting of the units Ethernet MAC address and a password which
consists of the unit’s Ethernet MAC address.
Some networking systems do not define network numbers in packets
sent out over a network. If a packet does not have a specific destination
network number, a router will assume that the packet is set up for the
local segment and will not forward it to any other sub-network. However,
in cases where two devices need to communicate over the wide-area,
bridging can be used to transport non-routable protocols.
Figure 2 illustrates transparent bridging between two routers over a
serial interface (s0). Bridging will occur between the two Ethernet Inter-
faces on Router A (e0 and e1) and the two Ethernet Interfaces on Router
B (e0 and e1).
Figure 2. Transparent bridging between two routers over a serial interface
10
4.0 CONFIGURATION
The Model 2701/I features configuration capability via hardware DIP
switches. This section describes all possible DIP switch configurations of
the Model 2701/I.
4.1 DIP SWITCH CONFIGURATION
The Model 2701/I has two sets of internal DIP switches that allow config-
uration for a wide range of applications. The sets of switches are
accessed from the underside. Figure 3 shows the location of the DIP
switches on the bottom of the printed circuit board.
Figure 3. Underside of Model 2701/I, Showing Location of DIP Switches
The Model 2701/I DIP switches (Switch Sets 1-2) can be configured as
either “ON” or “OFF”. Figure 4 shows the orientation of the DIP switches
with respect to ON/OFF positions.
Figure 4. Close up of configuration switches
11
Switch SW1
A detailed description of each switch (SW1-1 through SW1-5) setting fol-
lows the summary table below:
Switch SW-1 through SW1-5. Use Switches SW1-5 to set the DTE
data rate.
SW1 SW2 SW3 SW4 SW5
Speed
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
Off
Off
On
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
On
Off
On
On
On
On
On
On
On
On
Off
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
On
Off
Off
Off
Off
Off
64 kbps
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