3Com Nbx 100 And Ss3 Nbx Administration Guide

							Configuring and Managing T1 Digital Line Cards301
Verifying T1 Group Membership (ISDN PRI)
To verify that all channels are in the Member List:
1Return to the Digital Line Cards tab (Figure 113
).
2From the Select Device Type list, select ISDN PRI Group List.
3Click Apply.
4Select the group you want.
5Click Membership. The Manage Group Membership dialog box 
(Figure 122
) appears.
Figure 122   Manage Group Membership Dialog Box
6Scroll through the Member List to verify that all 23 channels are present.
7To change the membership of a group, you must move channels from the 
Non-Member List to the Member List. You cannot move a channel from 
the Member List to the Non-Member list of a group.
For each channel that you move to the Member List, you have two 
options:
aTo copy the current group settings, and apply them to the channel in 
the new group, enable the Copy Group Settings to Channels on 
Add/Remove check box.
bTo update the status of a channel, enable the Refresh Channels on 
Add/Remove check box. 
						

							302CHAPTER 3: DEVICE CONFIGURATION
Completing the T1 Configuration (ISDN PRI)
To complete the T1 ISDN PRI installation:
1Return to the Digital Line Cards tab.
2From the Select Device Type list, select ISDN PRI Channel List.
3Click Apply.
4Wait approximately 30 seconds for the status of each channel to change 
from Ready to Idle.
While you are waiting, you may click Apply to refresh the list of channels 
and to see the updated status. If you have connected the Telephone 
company’s T1 line to the T1 Digital Line Card or if you have connected a 
loopback connector to the T1 card, the Nominal status light on the front 
panel of the T1 board should now turn on (solid green). If the Nominal 
status light does not turn on and you have the telephone company’s T1 
line connected, disconnect the T1 line and connect a loopback connector. 
If the Nominal light now turns on, contact the telephone company for 
assistance with the T1 line. If the Nominal light does not turn on, contact 
3Com Technical Support.
T1 Card Status LightsThe T1 card contains these status lights:
■CF — Carrier Fail (when lit, indicates red alarm or blue alarm)
■RA — Remote Alarm (yellow alarm)
■LB — Loopback, when lit indicates that the card is in loop-back testing 
mode. This light is not used to indicate any of the red, blue, or yellow 
alarms.
■Nominal — T1 card is framed 
						

							Configuring and Managing T1 Digital Line Cards303
Modifying a T1 CardThese sections describes how to modify a T1 card that is already installed 
in the system.
■Modifying the T1 Card Name or Type
■Modifying a T1 Span
■Configuring Partial T1 Lines
■Modifying Audio Controls
Modifying the T1 Card Name or Type
You can change the name of a Digital Line Card at any time. You can also 
set the type to T1 or ISDN PRI.
To modify a T1 card name or type:
1In the NBX NetSet - Main Menu window, click Device Configuration 
(Figure 97
).
Figure 123   NBX NetSet - Main Menu Window
2In the Device Configuration window, click the Digital Line Cards tab. See 
Figure 124
. 
						

							304CHAPTER 3: DEVICE CONFIGURATION
Figure 124   Digital Line Cards Tab
3Select the board in the T1/ISDN Board List.
4Click Modify. The Modify Board dialog box (Figure 125
) appears.
Figure 125   Modify Board Dialog Box 
						

							Configuring and Managing T1 Digital Line Cards305
5To modify the name of the board, enter a new name in the Board Name 
field. You can use alphanumeric characters, dashes, and underscores. The 
maximum name length is 30 characters.
6To change the type of card, in the Card Type field, select either T1 (for T1 
DS1 protocol) or ISDN PRI (for T1 ISDN PRI).
7Click OK.
Modifying a T1 Span
To  m o d i f y  a  s p a n :
1Return to the Digital Line Cards tab.
2From the Select Device Type pull-down list, select either T1 Span List 
(for T1 DS1) or ISDN PRI Span List (for T1 ISDN PRI).
3Click Apply.
4Select the span you want to modify from the Span List.
5Click Modify.
The dialog box that appears depends on which span list you select.
Figure 126
 shows the T1 DS1 Modify Span dialog box.
Figure 127
 shows the ISDN PRI Modify Span dialog box.
Figure 126   Modify Span Dialog Box — T1 DS1 
						

							306CHAPTER 3: DEVICE CONFIGURATION
Figure 127     Modify Span Dialog Box — ISDN PRI
6Make the desired changes. Table 43 lists all span parameters for 
reference. The number of channels supported per span depends on the 
configuration of the Digital Line Card. If you configure the T1 Digital Line 
Card for DS1, it supports 24 channels. If you configure the card for ISDN 
PRI, it supports 23 channels. See “Support of AT&T’s 4ESS Switch 
Protocol” later in this section for details on configuring the NBX system 
for this protocol.
Table 49 Span Parameters
ParameterT1 DS1 OptionsISDN PRI (T1) Options
Span NameEnter as required.Enter as required.
Interface TypeN/AT1*
CO Switch 
ProtocolN/AETSI**
AT&T Custom 4ESS**
AT&T Custom 5ESS**
DMS Custom**
National ISDN-NI1/NI2**
QSIG slave**
Framing TypeD4**
ESF – Extended 
Super Frame **
ESF – Extended Super Frame*
F4 – 4 Frame Multiframe*
F12 – 12 Frame Multiframe (D4/SF)*
F72 – 72 Frame Multiframe (SLC96)*
Line CodeAMI**
B8ZS**
HDB3*
B8ZS* 
						

							Configuring and Managing T1 Digital Line Cards307
7Click Apply.
8Enable the On Line check box to bring the span online.
The span does not come online unless the card is online.
9Click OK to effect the changes.
Line LengthReflects the 
physical line 
length.
**
Reflects the physical line length.*
Timing ModeLoop
InternalN/A
Call-By-Call Service Configuration (4ESS only) ***
Enable 
Call-By-Call 
ServiceN/ASelect this only if your carrier provides, 
call-by-call service, you have AT&T Custom - 
4ESS as your line protocol, and you want to 
change the type of call for each call.
Carrier CodeN/AEach long distance carrier has a unique Carrier 
Identification Code (CIC). Obtain the code (up 
to 4 digits) from your carrier.
Default 
Outbound 
ServiceN/ADetermines the type of outbound call if no type 
is specified in your dial plan commands.
If you purchased MEGACOM service from your 
service provider, you must select it.
If you purchased only long distance service or 
SDN (Software Defined Network) service, select 
Standard (LDS). SDN cannot be the default 
selection. 
*If this value changes, the card reboots itself and all current calls on the card are lost.
**If this value changes, the card is temporarily offline, and all current calls on the card are lost.
*** See “Support of AT&T’s 4ESS Switch Protocol” later in this section.
Table 49 Span Parameters (continued)
ParameterT1 DS1 OptionsISDN PRI (T1) Options 
						

							308CHAPTER 3: DEVICE CONFIGURATION
Support of AT&T’s
4ESS Switch ProtocolYou can select AT&T’s 4ESS switch protocol when you configure a T1 
Digital Line Card for PRI (Primary Rate Interface) operation. If you select 
the 4ESS protocol, you can optionally use Call By Call Service 
Configuration which enables you to select one of three access services:
■Long Distance — The default service if the customer selects the 4ESS 
protocol, but purchases no other services. Long Distance can be used 
with SDN but not with MEGACOM.
■MEGACOM — A high-volume outward calling service. MEGACOM 
can be the default setting.
■SDN (Software Defined Network) — A premises-to-premises service 
with voice and voice-grade data transport, plus a number of 
customer-controllable call management and call monitoring features 
(for example, Virtual Private Networking). You cannot configure SDN 
as the default setting but you can configure the NBX system dial plan 
to use SDN.
Selecting the 4ESS Protocol
To select the 4ESS protocol:
1In the NBX NetSet Main Menu window, click Device Configuration.
2Click the Digital Line Cards tab.
3From the Select Device Type pull-down list, select ISDN PRI Span List.
4Click Apply. See Figure 128
. 
						

							Configuring and Managing T1 Digital Line Cards309
Figure 128   ISDN PRI Span List Dialog Box
5From the CO Switch Protocol pull-down list, select AT&T Custom - 4ESS.
6Click OK to enable the 4ESS protocol and exit from the dialog box. 
Otherwise click Apply to enable 4ESS, stay in the Modify Span dialog box, 
and configure Call-By-Call Service. See “Configuring Call-By-Call Service”
 
in the next section.
Configuring Call-By-Call Service
You order the optional Call-By-Call Service from your long-distance 
carrier, only if you order the 4ESS protocol. 3Com does not support 
Call-By-Call Service with any other protocol.
To configure Call-By-Call Service:
1In the Modify Span dialog box, click the Enable Call-By-Call Service check 
box.
2In the Carrier Identification Code text box, type the identification code for 
your long-distance carrier.
Your long-distance carrier can supply this code at the time that you order 
PRI services, or you can ask the carrier for their code number. Another 
way to obtain the code is to access the web site for the North American 
Number Plan Administration (http://www.nanpa.com). In the menu in the 
left frame, expand Number Assignments, and click Carrier Identification 
Codes. Follow the instructions to download and unzip the two files  
						

							310CHAPTER 3: DEVICE CONFIGURATION
(Current Feature Group B (950-XXXX) CIC Assignments and Current 
Feature Group D (101-XXXX) CIC Assignments). Search through the 
documents to determine the identification code for your long-distance 
carrier. For example, AT&T is listed next to code 288 in the Group D 
document.
3From the Default Outbound Service pull-down list, select either 
MEGACOM or Standard (LDS) as the service to use as the default. You 
can configure the NBX system dial plan to use a particular service.
Select MEGACOM as the default service only if you purchased 
MEGACOM from your long-distance carrier. You cannot select Standard 
(LDS) as the default service if you purchased MEGACOM, because these 
two services do not work together.
4Click OK.
Configuring Partial T1 Lines
Sometimes the telephone company supplies a T1 line which has less than 
the maximum number of channels implemented. This is called a 
Fractional, Partial, or Subequipped T1. For example, you may decide to 
purchase 15 channels now and implement more later in order to reduce 
your near-term costs.
Some telephone companies offer Partial T1 lines as their standard 
offering, and provide fully implemented T1 lines only if you make a 
specific request. If you are unaware of this policy, outbound calls using 
the T1 line may fail because, by default, the system places outbound calls 
using high numbered channels first, and a Fractional T1 typically has the 
lower numbered channels implemented.
In the Span Status dialog box, under Details of last five calls, if you see the 
error message REQ_CHANNEL_UNAVAIL, determine if the error is caused 
by a Partial T1;
1Remove the highest numbered channel from service (set it to offline in 
the Modify Channel dialog box) and retry the outbound call.
2Continue to remove channels until an outbound call succeeds.
3When the first outbound call succeeds, the highest numbered channel 
still in service represents the number of active (provisioned) channels in 
the Partial T1.
4Create two groups. Put all of the active channels in one group, and all of 
the inactive channels in the other. Mark the active group online and the 
inactive group offline.