Description
Tellabs 6923 826923 2W FXS SF Signaling Set Module Card Telecom
The Tellabs 6923 is a 2-wire FXS (Foreign Exchange Subscriber) single-frequency (SF) signaling set module designed for plug-in installation in Tellabs carrier telephony and digital cross-connect equipment. FXS signaling modules like this one interface the subscriber (telephone) side of a connection, providing battery feed, ringing, and supervision signaling over two-wire analog loops within a carrier system. The part number 826923 is printed on the faceplate.
Specifications & What's Included
- Manufacturer: Tellabs
- Model: 6923
- Part Number: 826923
- Type: 2W FXS SF (Single Frequency) Signaling Set
- Form Factor: Plug-in card / module (card-edge connector)
- Front panel: rcv in and xmt out test jacks (red banana-style), busy LED indicator
- Front panel level controls: rcv level switch (10 to 0 dB range), xmt level switch (10 to 0 dB range)
- Front connector blocks: rcv (receive) and xmt (transmit) terminal blocks
- Internal transformer module: TN branded, part number 37-0001 (visible on PCB)
- PCB also carries components marked 36-0008, 36-0015, and 87084880 (visible on relays/ICs)
- Module only — no chassis, shelf, or external cables included
Applications
The Tellabs 6923 2W FXS SF Signaling Set is a plug-in line card used in Tellabs digital carrier and channel bank systems for interfacing two-wire analog telephone subscriber loops into a digital transmission network. FXS modules handle the analog subscriber side of voice telephony: they supply loop current (battery), generate ringing voltage, and detect on/off-hook supervision — converting these analog signaling events for transport over the digital carrier system. Single-frequency (SF) signaling was a widely used inband signaling method in North American telephone networks, particularly in T-carrier and channel bank applications from the 1970s through the 1990s, where a 2600 Hz tone indicated on/off-hook states. Equipment of this type was standard in central office and carrier network environments and remains relevant for maintaining legacy Tellabs telephony infrastructure and channel bank systems still in service.
This Tellabs 6923 2W FXS SF Signaling Set module has been inspected and is in good condition. The faceplate and front panel controls are intact, with the level adjustment switches and LED test point jacks all present and undamaged. The PCB shows normal light aging consistent with prior rack use. No visible damage, burnt components, or missing parts. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Tellabs |
Model: |
6923 |
MPN: |
826923 |
Secondary Model: |
826923 |
SKU: |
31605 |
Type: |
2W FXS SF Signaling Set Module |
Interface Type: |
2-Wire FXS (Foreign Exchange Subscriber) |
Signaling Type: |
SF (Single Frequency) Signaling |
Form Factor: |
Plug-In Card / Module |
Front Panel Indicators: |
rcv in, busy, xmt out LED test points |
Front Panel Controls: |
rcv and xmt level adjustment switches (10 to 0dB) |
Connector Type: |
Edge connector (plug-in card); front test jacks |
Compatible With: |
Tellabs carrier telephony / digital cross-connect systems |
Condition: |
Used – Inspected, Good Condition |
Seller Notes: |
Module only; no chassis or external cables included. |
Country/Region of Manufacture: |
United States |
Condition Notes: |
Tellabs 6923 2W FXS SF Signaling Set module. Inspected and in good used condition. Faceplate, switches, and test jacks intact. PCB shows normal aging. No visible damage. |
