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w w w . C T C U . c o m
Switch 2 Settings
DIP SW2
SW STATE
Function
1,2,3,4,5
1
2
3
4
5
Fractional start timeslot setting
OFF
OFF
OFF
OFF
OFF
Full E1, Unframed mode
ON
OFF
OFF
OFF
OFF
Timeslot 1
OFF
ON
OFF
OFF
OFF
Timeslot 2
ON
ON
OFF
OFF
OFF
Timeslot 3
OFF
OFF
ON
OFF
OFF
Timeslot 4
ON
OFF
ON
OFF
OFF
Timeslot 5
OFF
ON
ON
OFF
OFF
Timeslot 6
ON
ON
ON
OFF
OFF
Timeslot 7
OFF
OFF
OFF
ON
OFF
Timeslot 8
ON
OFF
OFF
ON
OFF
Timeslot 9
OFF
ON
OFF
ON
OFF
Timeslot 10
ON
ON
OFF
ON
OFF
Timeslot 11
OFF
OFF
ON
ON
OFF
Timeslot 12
ON
OFF
ON
ON
OFF
Timeslot 13
OFF
ON
ON
ON
OFF
Timeslot 14
ON
ON
ON
ON
OFF
Timeslot 15
OFF
OFF
OFF
OFF
ON
Timeslot 16 (cannot set in CAS)
ON
OFF
OFF
OFF
ON
Timeslot 17
OFF
ON
OFF
OFF
ON
Timeslot 18
ON
ON
OFF
OFF
ON
Timeslot 19
OFF
OFF
ON
OFF
ON
Timeslot 20
ON
OFF
ON
OFF
ON
Timeslot 21
OFF
ON
ON
OFF
ON
Timeslot 22
ON
ON
ON
OFF
ON
Timeslot 23
OFF
OFF
OFF
ON
ON
Timeslot 24
ON
OFF
OFF
ON
ON
Timeslot 25
OFF
ON
OFF
ON
ON
Timeslot 26
ON
ON
OFF
ON
ON
Timeslot 27
OFF
OFF
ON
ON
ON
Timeslot 28
ON
OFF
ON
ON
ON
Timeslot 29
OFF
ON
ON
ON
ON
Timeslot 30
ON
ON
ON
ON
ON
Timeslot 31
6,7,8
6
E1 Frame Setting
OFF
CCS (PCM31)
ON
CAS (PCM30)
7
AIS transmit when Rx Signal loss
OFF
Disable
ON
Enable
8
E1 Idle Code Setting
OFF
0x7E
ON
0xFF
Notice: All of these settings are ignored if the card is placed in the
FRM220A-CH20
with
GSW/SNMP
or
FRM220-CH20
with
NMC
management. The card will follow the settings done via the chassis
management. (Refer to GSW/SNMP operation manual for details on
managing all cards.)
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Switch 3 Settings
DIP SW3
SW STATE
Function
1
1
IEEE 802.3u Auto-negotiation
OFF
Auto
ON
Forced (Manual)
2
2
Forced Speed
OFF
10M
ON
100M
3
3
Forced Duplex
OFF
Half Duplex
ON
Full Duplex
4
4
IEEE 802.3x Flow Control
OFF
Enable
ON
Disable
5-8
Reserved
Notice: All of these settings are ignored if the card is placed in the
FRM220A-CH20
with
GSW/SNMP
or
FRM220-CH20
with
NMC
management. The card will follow the settings done via the chassis
management. (Refer to GSW/SNMP operation manual for details on
managing all cards.)
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Loop back Test:
This FRM220A-Eoe1 converter incorporates loop back features which
allow loop back testing to confirm that the E1 loop is operating normally or
not. Since Ethernet is the data port side of this DSU/CSU, loopback cannot
be supported. (Ethernet looped would cause a broadcast storm.) Therefore,
only loop backs that specifically can test the E1 link are supported in this
model.
E1 Port Loop Back
Remote Side
Local Side
RLB
Remote
Loop Back
Remote Side
Local Side
RRLB
Request
Remote
Loop Back
E1
E1
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w w w . C T C U . c o m
Applications
The FRM220A-Eoe1 E1 LAN Bridge DSU/CSU works in point-to-point
applications, either as a stand-alone (in CH01, 02, 04) or when placed in
the FRM220A-CH20 managed rack.
Ethernet over E1
Typical Point-to-Point Application
The E1 transmission signal traditionally has been used to carry voice
within the Public Switched Telephone Network. With the emergence of IP,
E1 has also found use as a carrier for Data. E1 is able to carry Ethernet
data by using HDLC (High-level Data Link Control) WAN encapsulation.
The FRM220A-Eoe1 uses an HDLC bridge chip to send the Layer 2
encapsulated synchronous bit stream over the Layer 1 E1 transmission. A
carrier can then use this transparent Ethernet to connect to a customer
owned broadband router. The FRM220A-Eoe1 supports ISO 13239
standard HDLC encapsulation.
Broadband Router over E1
Deployment in Data Communications Network
Ethernet
Ethernet
Remote
Loc
Internal
Recovery
E1
Ethernet
Ethernet
Remote
Local
Recovery
Recovery
E1
E1
SDH
Router
Router
