Patton electronic PATTON 2707/I User Manual
USER
MANUAL
MODEL 2707/I
G.703 NTU with 10Base-T
Ethernet Interface
An ISO-9001
Part# 07M2707/I-A
Doc# 086251UA
Revised 10/2/01
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
1.0 Warranty Information .................................................................. 4
1.1 Radio and TV Interference............................................................ 4
1.2 CE Notice...................................................................................... 4
1.3 Service.......................................................................................... 4
2.0 General Information..................................................................... 6
2.1 Features........................................................................................ 6
2.2 Description.................................................................................... 6
3.0 PPP Operational Background..................................................... 7
3.1 Applications .................................................................................. 7
4.0 Configuration............................................................................... 9
4.1 DIP Switch Configurations............................................................ 9
Switch S1 settings...................................................................... 10
SW1-1 Line Coding: HDB3 (default)........................................... 10
5.0 Installation.................................................................................. 12
5.1 Connecting to the G.703 Network and Ethernet LAN................. 12
Connecting Dual Coaxial Cable (75 ohm) to the
G.703 Network.......................................................................... 13
Connecting the Twisted Pair (120 ohm) to the
G.703 Network.......................................................................... 14
Connecting the 10Base-T Ethernet port to a PC (DTE) ............. 14
Connecting the 10Base-T Ethernet Port to a Hub...................... 15
Power Connection...................................................................... 15
Universal AC Power (100–240 VAC) ..................................15
DC Power ............................................................................ 16
6.0 Operation.................................................................................... 17
6.1 Power-up .................................................................................... 17
6.2 LED Status Monitors................................................................... 17
6.3 Operating Line Loopback (LL).................................................... 19
A G.703 Specifications.................................................................. 20
A.1 Network Data Rate .......................................................20
A.2 Network Connector ......................................................20
A.3 Nominal Impedance ......................................................20
A.4 Line Coding ......................................................................20
A.5 Line Framing ...................................................................20
A.6 Clocking ............................................................................20
A.7 Distance ...........................................................................20
B Ethernet 10Base-T Specifications............................................ 21
B.1 DTE Interface ..................................................................21
B.2 DTE Data Rates ...............................................................21
B.3 LAN Connection .............................................................21
B.4 Protocol ............................................................................21
B.5 MAC Address Table Size ...............................................21
B.6 MAC Address Aging .......................................................21
B.7 Frame Buffer ...................................................................21
B.8 Frame Latency ...............................................................21
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B.9 Diagnostics ......................................................................21
B.10Indicators ........................................................................21
B.11Configuration ..................................................................21
B.12Power Supply ..................................................................22
B.13Humidity ...........................................................................22
B.14Temperature ...................................................................22
B.15Dimensions ......................................................................22
C Factory Replacement Parts and Accessories......................... 23
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1.0 WARRANTY INFORMATION
Patton Electronics
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
product. These damages include, but are not limited to, the follo wing: lost
profits, lost savings and incidental or consequential damages arising
from the use of or inability to use this product.
cifically disclaims all other warranties, expressed or implied, and the
installation or use of this product shall be deemed an acceptance of
these terms by the user.
1.1 RADIO AND TV INTERFERENCE
The Model 2707/I generates and uses radio frequency energy, and if not
installed and used properly—that is, in strict accordance with the manufacturer's instructions—may cause interference to radio and television
reception. The Model 2707/I has been tested and found to comply with
the limits for a Class A computing device in accordance with the specifications in Subpart B of Part 15 of FCC rules, which are designed to provide reasonable protection from such interference in a commercial
installation. However, there is no guarantee that interference will not
occur in a particular installation. If the Model 2707/I does cause interference to radio or television reception, which can be determined by disconnecting the cables, the user is encouraged to try to correct the
interference by one or more of the following measures: moving the computing equipment away from the receiver, re-orienting the receiving
antenna, and/or plugging the receiving equipment into a different AC outlet (such that the computing equipment and receiver are on different
branches).
warrants all Model 2707/I components to be free
be liable for any damages incurred b y the use of this
Patton Electronics
spe-
1.2 CE NOTICE
The CE symbol on your Patton Electronics equipment indicates that it is
in compliance with the Electromagnetic Compatibility (EMC) directive
and the Low Voltage Directive (LVD) of the Union European (EU). A Certificate of Compliance is available by contacting Technical Support.
1.3 SERVICE
All warranty and nonwarranty repairs must be returned freight prepaid
and insured to Patton Electronics. All returns must have a Return Materi-
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als Authorization number on the outside of the shipping container. This
number may be obtained from Patton Electronics Technical Services at:
• Tel: +1
• Email:
• URL:
Note
Caution
(301) 975-1007
support@patton.com
http://www.patton.com
Packages received without an RMA number will not be
accepted.
This device is not intended to be connected to the public
telephone network.
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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 Patton Electronics Technical Support at (301) 975-1007.
2.1 FEATURES
• Terminates G.703 E1 service
• Available in low-cost standalone or rack-mountable versions
• 2.048 Mbps data rate
• 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
• Line loopback diagnostics
• Internal and G.703 network timing
• CE marked
• 100–240 VAC & 48 VDC power options
• Conforms to ONP requirement CTR 12 for connection to international
Telecom networks
2.2 DESCRIPTION
The Model 2707/I receives clear channel E1/G.703 (2.048-Mbps) data
from the telco's digital data network. The Model 2707/I terminates the
G.703 telco interface and converts the data for transmission to a useroriented 10Base-T (802.3) Ethernet interface.
The Ethernet (Model 2707/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 2707/I attaches to the LAN
and intelligently bridges data traffic to the large central site router
through the telco's leased line network. The 2707/I supports PPP (RFC
1661) and BCP (RFC 1638).
The Model 2707/I is a 10Base-T bridge that operates over G.703 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.
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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-topeer protocol, which can be divided into the following main components:
• A standard method to encapsulate datagrams over serial links
• A Link Control Protocol (LCP) to establish, configure, and test the
data-link connection
• A family of Network Control Protocols (NCPs) to establish and config-
ure 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, configures and enables/disables the bridge protocol on both ends of the pointto-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 network 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 WAN line to the remote bridge functions as a Virtual
Ethernet interface, effectiv ely extending the routers W AN port connection
to the remote network. The bridge de vice sends bridge packets (BPDU’s)
to the router’s WAN interface. The router will receive the layer three
address information and will forward these packets based on its IP
address.
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Model 2707/I
E1
Model 2707/C
Router
Internet
Ethernet
LAN
Customer’s Site
Figure 1.
Cisco router with serial interface, configured as PPP Half Bridge.
Service Provider’s Network
Figure 1 shows a typical Cisco router with a serial interface configured
as a PPP Half Bridge. The router serial interface connects to the WAN
via a 2707/C (V.35) E1 NTU and to the remote 2707/I with support for
PPP bridging. The 2707/I functions 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.
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 2707/I. The associated Cisco
configuration will set serial interface (s0) to accommodate half bridging
for the above example.
!
interface s0
ppp bridge ip
ip address 192.168.1.1 255.255.255.0
!
Authentication is optional under PPP. In a point-to-point leased-line link,
incoming customer facilities are usually fixed in nature , therefore authentication is generally not required.
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.
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