Patton electronic Switch 2707 I User Manual

USER  
MANUAL  
MODEL 2707/I  
G.703 NTU with 10Base-T  
Ethernet Interface  
Part# 07M2707I  
Doc# 08625U2-001  
Rev. B  
SALES OFFICE  
(301) 975-1000  
TECHNICAL SUPPORT  
(301) 975-1007  
Revised 6/30/06  
An ISO-9001  
 
B.9 Diagnostics ................................................................................. 21  
B.10 Indicators .................................................................................... 21  
B.11 Configuration .............................................................................. 21  
B.12 Power Supply .............................................................................. 22  
B.13 Humidity ...................................................................................... 22  
B.14 Temperature ............................................................................... 22  
B.15 Dimensions ................................................................................. 22  
C
Factory Replacement Parts and Accessories........................ 23  
3
 
1.0 WARRANTY INFORMATION  
Patton Electronics warrants all Model 2707/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 spe-  
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 manu-  
facturer'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 specifi-  
cations in Subpart B of Part 15 of FCC rules, which are designed to pro-  
vide 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 interfer-  
ence to radio or television reception, which can be determined by discon-  
necting the cables, the user is encouraged to try to correct the  
interference by one or more of the following measures: moving the com-  
puting equipment away from the receiver, re-orienting the receiving  
antenna, and/or plugging the receiving equipment into a different AC out-  
let (such that the computing equipment and receiver are on different  
branches).  
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 Cer-  
tificate 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-  
4
 
       
als 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.  
This device is not intended to be connected to the public  
telephone network.  
Caution  
5
 
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 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 user-  
oriented 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.  
6
 
     
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 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, 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 WAN line to the remote bridge functions as a Virtual  
Ethernet interface, effectively extending the routers WAN port connection  
to the remote network.The bridge device 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.  
7
 
   
Model 2707/I  
Model 2707/C  
Router  
E1  
Internet  
Ethernet  
LAN  
Customer’s Site  
Service Provider’s Network  
Figure 1. Cisco router with serial interface, configured as PPP Half Bridge.  
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 authen-  
tication 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.  
8
 
 
4.0 CONFIGURATION  
The Model 2707/I features configuration capability via hardware DIP  
switches.This section describes all possible DIP switch configurations of  
the Model 2707/I.  
4.1 DIP SWITCH CONFIGURATIONS  
The Model 2707/I has an internal DIP switch that enables configuration  
for a wide range of applications. The DIP switch is accessed from the  
underside. Figure 2 shows the location of the DIP switches on the bottom  
of the printed circuit board.  
Front  
S1  
Rear  
Figure 2. Underside of Model 2707/I, showing location of DIP switches  
The DIP switches can be configured as either “ON” or “OFF”. Figure 3  
shows the orientation of the DIP switches with respect to ON/OFF posi-  
tions.  
ON  
ON  
1
2
3
4
5
6
7
8
OFF  
OFF  
Figure 3. Close-up view of configuration switches  
9
 
   
Switch S1 settings  
Table 1 shows the settings for DIP switch S1-1 thru S1-8.  
Table 1: Switch S1 settings  
Switch  
Description  
Line Coding  
Setting  
S1-1  
Off = HDB3  
On = AMI  
S1-2  
Line Loopback (toward  
E1 line)  
Off = LLB disabled  
On = LLB enabled  
Note The Model 2707/I, when  
in line loopback mode,  
will loop the network line  
and return any trafic  
received on the E1 line  
to the sending device at  
the remote end.  
S1-3  
S1-4  
S1-5  
Reserved  
Reserved  
Reserved  
Off = Default  
Off = Default  
Off = Default  
S1-6/S1-7 Clocking  
Switch  
1-6  
Switch  
1-7  
On  
On  
Off  
Off  
On  
Off  
On  
Off  
Network  
Internal (default)  
Reserved  
Network  
S1-8  
Reserved  
Off = Default  
SW1-1 Line Coding: HDB3 (default)  
Use Switch SW1-1 to control the Network Line Coding options. Set these  
options to be the same as the Line Coding given to you by your Service  
Provider. If you are using two Model 2707/Is together as short range  
modems, set both units to HDB3.  
SW1-1 Line Encoding  
Off  
On  
HDB3  
AMI  
Options: HDB3, AMI  
HDB3. In this line coding, the transmitter substitutes a deliberate bipo-  
lar violation when excessive zeros in the data stream are detected.  
10  
 
   
The receiver recognizes these special violations and decodes them as  
zeros. This method enables the network to meet minimum pulse den-  
sity requirements. Unless AMI is required in your application, HDB3  
should be used whenever possible.  
AMI. Alternate Mark Inversion defines a pulse as a "mark,” a binary  
one, as opposed to a zero. In an E1 network connection, signals are  
transmitted as a sequence of ones and zeros. Ones are sent as  
pulses, and zeros are sent as spaces, i.e., no pulse. Every other pulse  
is inverted from the previous pulse in polarity, so that the signal can be  
effectively transmitted. This means, however, that a long sequence of  
zeros in the data stream will cause problems, since the NTU receiving  
the signal relies on the signal to recover the 2.048 Mbps clock.  
Note If you must use AMI, you should ensure that the data terminal  
equipment connected to the unit provides a minimally accept-  
able pulse density. For this reason, there are advantages to  
using HDB3 instead. AMI coding does not inherently account for  
ones density. To meet this requirement, the user should ensure  
that the data inherently meets pulse density requirements.  
11  
 
5.0 INSTALLATION  
Once the Model 2707/I is properly configured, it is ready to connect to  
the G.703 interface, to the Ethernet port, and to the power source. This  
section describes how to make these connections.  
This section describes installing the G.703 (75-ohm and 120-ohm),  
Ethernet LAN, and power connections (shown in Figure 4). Refer to the  
following to detemine which installation procedures you will use:  
necting to a 75-ohm dual coax G.703 network interface. If your G.703  
network terminates via dual coaxial cables, refer to section “Connect-  
ing Dual Coaxial Cable (75 ohm) to the G.703 Network” on page 13  
twisted-pair G.703 network interface. If your G.703 network terminates  
with a RJ-48C, refer to section “Connecting the Twisted Pair (120 ohm)  
to the G.703 Network” on page 14.  
• The Ethernet 10Base-T port is configured as DTE (Data Terminal  
Equipment). If the Model 2707/I is to connect to another DTE device  
such as a 10Base-T network interface card in a PC, refer to “Connect-  
ing the 10Base-T Ethernet port to a PC (DTE)” on page 14. Otherwise,  
refer to “Connecting the 10Base-T Ethernet Port to a Hub” on page 15.  
• Refer to “Power Connection” on page 15 to connect the Model 2707/I  
to a 100–240 VAC source or to a 36–60 VDC DC-to-DC adapter.  
120 ohm  
Power Ethernet  
75 ohm  
75 ohm  
TX  
RX  
Figure 4. Model 2707/I rear panel  
12  
 
     
Connecting Dual Coaxial Cable (75 ohm) to the G.703 Network  
Refer to Figure 5 to make the proper connections.  
TX  
RX  
Data  
DataTO  
FROM  
Network  
Network  
Figure 5. Rear panel, showing location of connectors  
Note The outer conductor of the coax cables are isolated from system  
earth ground.  
When using the 75-ohm interface, jumper straps JP2, JP5, JP6, and JP7  
must be installed over the jumpers. The jumpers are located next to the  
BNC connectors. Do the following to configure the jumpers:  
1. Open the case by inserting a screwdriver into the slots and twist the  
screwdriver head slightly. The top half of the case will separate from  
the lower half of the case.Take caution not to damage any of the PC  
board mounted components  
2. Open the case and install jumper straps for JP2, JP5, JP6, and JP7.  
13  
 
   
Connecting the Twisted Pair (120 ohm) to the G.703 Network  
Refer to the pinout and signals chart in Figure 6 to connect the 120-ohm  
G.703 network channel.  
NETWORK SIGNAL  
SIGNAL PIN#  
RX(R)  
RX(T)  
TX(R)  
TX(T)  
4
5
TX(R)  
TX(T)  
RX(R)  
RX(T)  
1
2
Shield  
Shield  
Shield  
Shield  
3
6
RJ-48C Jack  
Signal Name  
1
2
3
4
5
6
7
8
(RX) Receive (Ring)  
(RX) Receive (Tip)  
Shield  
(TX) Transmit (Ring)  
(TX) Transmit (Tip)  
Shield  
1
2
3
4
5
6
7
8
No connection  
No connection  
Figure 6. G.703 120-ohm connection.  
Connecting the 10Base-T Ethernet port to a PC (DTE)  
To connect the Model 2707/I to another DTE device such as a 10Base-T  
network interface card, construct a 10Base-T crossover cable and con-  
nect the wires as shown in Figure 7 below and Figure 8 on page 15.  
1 TD+ (data output from 2707/I)  
2 TD- (data output from 2707/I)  
3 RD+ (data input to 2707/I)  
4 (no connection)  
5 (no connection)  
6 RD- (data input to 2707/I)  
7 (no connection)  
1
2
3
4
5
6
7
8
8 (no connection)  
Figure 7. Connecting the 10Base-T Ethernet Port to a PC  
14  
 
     
10Base-T Port  
RJ-45 Pin No.  
10Base-T DTE  
RJ-45 Pin No.  
1 (TD+)  
2 (TD-)  
1 (TD+)  
2 (TD-)  
3 (RD+)  
6 (RD-)  
3 (RD+)  
6 (RD-)  
Figure 8. 10Base-T cross-over cable connection  
Connecting the 10Base-T Ethernet Port to a Hub  
The 10Base-T interface is configured as DTE (data terminal equipment),  
just like a 10Base-T network interface card in a PC. Therefore, it  
“expects” to connect to a 10Base-T Hub using a straight-through RJ-45  
cable. Refer to Figure 9 below and Figure 7 on page 14 to construct a  
cable to connect the 10 Base-T interface to a 10Base-T hub.  
10Base-T Port  
RJ-45 Pin No.  
10Base-T Hub  
RJ-45 Pin No.  
1 (TD+)  
2 (TD-)  
1 (RD+)  
2 (RD-)  
3 (RD+)  
6 (RD-)  
3 (TD+)  
6 (TD-)  
Figure 9. Connecting the 10Base-T Ethernet port to a hub  
Power Connection  
Universal AC Power (100–240 VAC). The Model 2707/I uses a 5VDC,  
2A universal input 100-240VAC, power supply (center pin is +5V). The  
universal input power supply has a male IEC-320 power entry connector.  
This power supply connects to the Model 2707/I by means of a barrel  
jack on the rear panel. Many international power cords are available for  
the universal power supply.  
Note The Model 2707/I powers up as soon as it is plugged into an AC  
outlet—there is no power switch.  
15  
 
         
DC Power. The 36–60 VDC DC-to-DC adapter supplied with the DC ver-  
sion of the Model 2707/I plugs in a DC source (nominal 48 VDC) and  
plugs into the barrel power supply jack on the rear of the 2707/I. Refer to  
Figure 10 to make the proper connection.  
To power  
supply jack  
To -48 VDC  
source  
+Vin  
-Vin  
Figure 10. Connecting DC power to the 2707/I DC power supply  
16  
 
   
6.0 OPERATION  
When the Model 2707/I has been properly configured and installed, it  
should operate transparently. This section describes power-up, LED sta-  
tus monitors, and the built-in loopback test modes.  
6.1 POWER-UP  
Before applying power to the Model 2707/I, please review section “Power  
Connection” on page 15 to verify that the unit is properly connected to  
the appropriate power source.  
6.2 LED STATUS MONITORS  
The Model 2707/I features six front panel LEDs that monitor connections  
on the G.703 and 10Base-T links, signaling, error and test modes.  
Figure 11 shows the front panel location of each LED. Table 2 on  
page 18 lists descriptions of each LED.  
10Base-T  
Figure 11. 2707/I front panel  
17  
 
     
Table 2: LED descriptions  
LED  
Description  
E1 Link  
(Active Green) Solid green (On) indicates that the end to  
end E1 Link is up, signifying that the link is active.The E1  
Link LED is Off when the link is down.  
10BT Link (Active Green) Solid green indicates that the 10Base-T  
Ethernet interface has detected a valid SQE heartbeat,  
signifying a valid 10Base-T connection.  
Status  
Blinks yellow from one to eleven times to indicate system  
status. Each pulse pattern is separated by a 2 second  
“off” period. Greater pulse patterns have higher priority  
(buffer saturation has greater priority than an empty MAC  
table). Valid system statuses are:  
1 pulse—system status is okay  
2 pulses —no MAC entries in the MAC Address Table  
3 pulses—Clear to Send (CTS) or Carrier Detect (DCD)  
from base unit are not asserted  
4 pulses—IM1/I buffer is saturated  
5 pulses —WAN receive frame(s) too large  
6 pulses —WAN receive frame(s) not octet aligned  
7 pulses—WAN receive frame(s) aborted  
8 pulses—Detected WAN receive frame(s) with CRC  
9 pulses—Detected LAN receive frame(s) too large  
10 pulses—Detected LAN receive frame(s) not octet  
aligned  
11 pulses—Detected LAN receive frame(s) with bad  
CRC  
TM  
(Active Yellow) Solid Yellow indicates an Active Test  
Mode.  
18  
 
6.3 OPERATING LINE LOOPBACK (LL)  
The Line Loopback (LL) test checks the operation of the local Model  
2707/I, and is performed separately on each unit.  
G.703 NTU  
Model 2707/I  
Network  
2 Mbps G.703  
Network  
Ethernet  
Device  
Clocking  
Data  
Cable Span  
Clock/  
Data  
Clock/  
Data  
Model  
2707/I  
Figure 12. Line loopback for a network termination application  
To perform an LL test, set DIP switch S1-2 to On. The TM LED will be lit  
while the unit is in loopback test mode.  
19  
 
 
APPENDIX A  
G.703 SPECIFICATIONS  
A.1 NETWORK DATA RATE  
2.048 Mbps  
A.2 NETWORK CONNECTOR  
RJ-48C/Dual Coax BNC  
A.3 NOMINAL IMPEDANCE  
75/120 ohm  
A.4 LINE CODING  
Selectable AMI or HDB3  
A.5 LINE FRAMING  
G.703 (Unframed)  
A.6 CLOCKING  
Internal or Network (Receive Recover)  
A.7 DISTANCE  
Maximum 6,000 ft (1.6 km) On 24 AWG cable  
20  
 
               
APPENDIX B  
ETHERNET 10BASE-T SPECIFICATIONS  
B.1 DTE INTERFACE  
10Base-T on RJ-45F  
B.2 DTE DATA RATES  
10 Mbps  
B.3 LAN CONNECTION  
RJ-45, 10Base-T, 802.3 Ethernet  
B.4 PROTOCOL  
PPP (RFC 1661) with Bridging Control (RFC 1638)  
B.5 MAC ADDRESS TABLE SIZE  
4096 entries  
B.6 MAC ADDRESS AGING  
MAC addresses deleted after 8 minutes of inactivity  
B.7 FRAME BUFFER  
512 Frames  
B.8 FRAME LATENCY  
1 frame  
B.9 DIAGNOSTICS  
Line Loopback  
B.10 INDICATORS  
E-1 Link, 10Base-T Link, Ethernet Status, Test Mode  
B.11 CONFIGURATION  
8-Position DIP Switch  
21  
 
                       
B.12 POWER SUPPLY  
5 VDC external power supply 100–240VAC, 50–60Hz, 0.4A  
B.13 HUMIDITY  
Up to 90% non-condensing  
B.14 TEMPERATURE  
0–50°C (32–122°F)  
B.15 DIMENSIONS  
3.5L x 2.1W x 0.78H in.(9.0L x 5.3W x 2.0H cm)  
22  
 
       
APPENDIX C  
FACTORY REPLACEMENT PARTS AND ACCESSORIES  
Patton Model #  
Description  
2707/C  
2707/D  
G.703 NTU with a V.35 interface  
G.703 NTU with an X.21 interface  
G.7034 NTU with 10Base-T ethernet interface  
Universal Input Power Supply  
User Manual  
2707/I  
08055DCUI  
07M2707/I  
23  
 
 
Copyright © 2006  
Patton Electronics Company  
All Rights Reserved.  
24  
 

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