1 SUPV The Supervisory port allows the user to connect to the 1558D via a PC running the suppl ied L APS softw are.
2 Power The power (green) L ED will be ON whe n a nominal power source of 110 volts AC is present.
3 Locked When the Lock ed amber LED is on, the 1558 D has been manu ally or remo tely (soft c ontrol) force d and locked to
4 A / B These green status LEDs indicate which of the two T1 receive paths (A or B) is presently actively carrying the service
5 Path Select
Auto/A/B
6 Alarm
A/B
7 LOS When on, thes e red LEDs indicate that no T1 pulses are being detected on the receive signal paths from the ne tw ork
8 Loop
A/B
9/10 Test Jacks Bantam test access jacks and bridge/monitor jacks are provided to gain physical test access to the T1 path for NET A,
11Send Data This green LED will indicate that data transitions are present on the Send Data (to the network) lead coming from the
12 Receive
Data
13TestThis LED (tri-colored amber, red, green) will indicate when the DSU portion of the 1558D has been placed in a test
14Loop
Switch
either the A or B path. Moving the Path Select switch back to the AUTO position or remotely sending an unlock command will turn off this LED and restores normal APS operation.
The user can manually force and lock either the A or B path as the active path by moving this switch from the AUTO
position to either the A or B position. The 1558D is now manually locked to this path and will not switch from it, even
if the selected path fails
When on, these red LEDs indicate that one or more of the user definable alarm parameters (ES, CSES, LOS, and LOF)
have been met or exceeded for Pa th A or Path B, respectively.
for Path A or Path B, respectively.
When on, these amber LED indicates that a loop (either manually or under soft control) has been activated for Path A
or Path B, respectively .
NET B, and the T1 DTE transmit an d receive signal paths (see 1558D Bloc k Diag r am).
DTE equipment. The LED will be on for a mark condition and off for a space condition. The LED will vary in intensity
depending upon the relative number of marks or spaces present at any gi ven time.
This green LED will indicate that data transitions are present on the Receive Data lead coming from the active network
path (A or B). The LED will be on for a mark condition and off for a space condition. The LED will vary in intensity
depending upon the relative number of marks or spaces present at any gi ven time.
mode either via re mote co mmand s or activ ation of t he front p anel lo op switch. The LED wi ll be ON (a mber) whe n
the manual swi tch i s pl aced in the l oc al lo op p osit ion or w hen a rem o te eq uip men t or V.5 4 loop co mm and h as b ee n
received. Initially, the LED will be on (amber) when the manual loop switch is placed in the Remote Loop (V.54)
position. After activation, the LED will turn from yellow to red if the unit does not detect a far end V.54 loop. If a loop
is detected from the far end, the LED will change from amber to green (far unit in loop).
This three position loop switch (Remote Loop, Normal, Local Loop) al lows the user to initiate a LL (local loop) or a
far end 1558D RL (remote V.5 4 loop). Moving the switc h to the LL (lo cal lo op) posit ion ini tia tes a loo p of both th e
A and B paths back to the 1558D unit (see 1558D Block Diagram). Placing the switch in the RL position initiates a
V.54 inband loop comma nd towards the far end unit. A V.54 loop initiates an an Equipment Loop of the far end unit
(see 1558D Block Diagram. Mov in g the switch back to the Normal position removes the loop co ndi ti on (either local
or remote). The Remo te loop/unloop process takes approximately 5 seconds to complete.
1558D
NET BNET A
COM BUS
ON
S1S2S3
V.35
ON
S4
ALARM
GND
N.O.
COM
N.C.
IN OUT
1558D Wiring and Connector Information
COM BUS IN
PIN
RJ11 6-pin
Modual
Connector
1Not UsedNot Used
2Signal GroundSignal Ground
3Data, outputData, Output
4Data, inputNot Used
5Signal GroundSignal Ground
6Not UsedNot Used
COM BUS Out
RJ11 6-pin
Modual
Connector
OFF
1558D Rear View
FunctionCCITTName
Frame Ground101FGA
Signal Ground102SGB
Send Data103 A/BSDP, S
Receive Data104 A/BRDR, T
Request to Send105 BRTSC
Clear to Send106 BCTSD
Data Set Ready107 BDSRE
Data Terminal
Ready
108 BDTRH
Direction
DTE....1558
OFF
1558D V.35
(34 pin, female)
Data Carrier Detect109 BDCDF
Pin
NET A & B, RJ48
Modular Connectors
Transmit Clock114 A/BTCY, AA
Receive Clock115 A/BRCV, X
1 Data In, T ip
2 Data In, Ring
3 Not Used
External Clock113 A/BEXT.TCU, W
Test Mode142TMK
4 Data Out, Tip
5 Data Out, Ring
6 Not Used
7 Not Used
8 Not Used
Terminal1558D Alarm Relay Terminal Descriptions
GND
(Ground)
N.0.
(normally open)
COM
This terminal can be used to connect the 155D to a good earth
ground
External alarm equipment requiring a normally open contact
should be wired to this terminal and the common terminal
Common lead for the 1558D alarm relay contact(s)
(Common)
N.C.
(normally closed)
External alarm equipment requiring a normally closed contact
should be wired to this terminal and the common terminal
1558D Option Switch Configuration Information
Option Switch S1, Pos. 1 - 8
Position Description
OFF
1
2,3
4
5
6
7
8
= Card Function, Slave
ON= Card Function, Master
,OFF
OFF
= Boot from Switches
OFF,ON = Boot from Manager
ON,OFF = Boot from RAM
ON,ON = Boot from ROM
OFF
= ARM from ROM
ON= ARM from RAM
OFF
= Enable Frame Error Alarm
ON = Disable Frame Error Alarm
OFF
= LOS, Enabled
ON= LOS, Disabled
OFF
= NET/ A, B8ZS
ON = NET/A, AMI
OFF
= NET/B, B8ZS
ON = NET/B, AMI
Option Switch S2, Pos. 1 - 8
Position Switch S2 Description
OFF
1
2
3,4NET A LBO Value
5,6NET A LBO Value
7,8
= CSU Mode, Enabled
ON = CSU Mode, Disabled
OFF
= Path Revert, Disabled
ON = Path Revert, Enabled
OFF, OFF
0.0 db
7.5 db OFF, ON
15.0 db ON, OFF
22.5 db ON, ON
OFF, OFF
0.0 db
7.5 db OFF, ON
15.0 db ON, OFF
22.5 db ON, ON
OFF, OFF
=Network Clocking
OFF, ON = Network Clocking
ON, ON = Internal Clocking
ON, OFF = External DTE Clocking